Home file server / disk enclosure troubles

On March 26th the file server here at home started resetting one of its ATA links over and over, in a couple of bursts each hour. Like this:

Mar 26 13:38:34 specialbrew kernel: [5137674.573170] ata5.03: exception Emask 0x0 SAct 0xc0 SErr 0x400000 action 0x6
Mar 26 13:38:34 specialbrew kernel: [5137674.579164] ata5.03: irq_stat 0x00060002, device error via SDB FIS
Mar 26 13:38:34 specialbrew kernel: [5137674.585127] ata5.03: SError: { Handshk }
Mar 26 13:38:34 specialbrew kernel: [5137674.591016] ata5.03: failed command: WRITE FPDMA QUEUED
Mar 26 13:38:34 specialbrew kernel: [5137674.596962] ata5.03: cmd 61/80:30:80:79:10/00:00:14:00:00/40 tag 6 ncq 65536 out
Mar 26 13:38:34 specialbrew kernel: [5137674.596962]          res 41/84:00:9f:79:10/00:00:14:00:00/40 Emask 0x410 (ATA bus error) <F>
Mar 26 13:38:34 specialbrew kernel: [5137674.609065] ata5.03: status: { DRDY ERR }
Mar 26 13:38:34 specialbrew kernel: [5137674.615131] ata5.03: error: { ICRC ABRT }
Mar 26 13:38:34 specialbrew kernel: [5137674.621135] ata5.03: failed command: WRITE FPDMA QUEUED
Mar 26 13:38:34 specialbrew kernel: [5137674.627123] ata5.03: cmd 61/80:38:00:7a:10/00:00:14:00:00/40 tag 7 ncq 65536 out
Mar 26 13:38:34 specialbrew kernel: [5137674.627123]          res 98/d7:00:00:00:00/00:00:00:70:98/00 Emask 0x2 (HSM violation)
Mar 26 13:38:34 specialbrew kernel: [5137674.639241] ata5.03: status: { Busy }
Mar 26 13:38:34 specialbrew kernel: [5137674.645349] ata5.03: error: { ICRC UNC AMNF IDNF ABRT }
Mar 26 13:38:34 specialbrew kernel: [5137674.651591] ata5.03: hard resetting link
Mar 26 13:38:34 specialbrew kernel: [5137674.976944] ata5.03: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
Mar 26 13:38:34 specialbrew kernel: [5137674.984592] ata5.03: configured for UDMA/100
Mar 26 13:38:34 specialbrew kernel: [5137674.990852] ata5: EH complete

Or this:

Mar 26 13:53:36 specialbrew kernel: [5138576.767785] ata5.02: exception Emask 0x0 SAct 0x100000 SErr 0x400000 action 0x6
Mar 26 13:53:36 specialbrew kernel: [5138576.774595] ata5.02: irq_stat 0x00060002, device error via SDB FIS
Mar 26 13:53:36 specialbrew kernel: [5138576.781330] ata5.02: SError: { Handshk }
Mar 26 13:53:36 specialbrew kernel: [5138576.788067] ata5.02: failed command: WRITE FPDMA QUEUED
Mar 26 13:53:36 specialbrew kernel: [5138576.794853] ata5.02: cmd 61/80:a0:00:20:a8/00:00:25:00:00/40 tag 20 ncq 65536 out
Mar 26 13:53:36 specialbrew kernel: [5138576.794853]          res 41/84:80:00:20:a8/00:00:25:00:00/00 Emask 0x410 (ATA bus error) <F>
Mar 26 13:53:36 specialbrew kernel: [5138576.808592] ata5.02: status: { DRDY ERR }
Mar 26 13:53:36 specialbrew kernel: [5138576.815527] ata5.02: error: { ICRC ABRT }
Mar 26 13:53:36 specialbrew kernel: [5138576.822504] ata5.02: hard resetting link
Mar 26 13:53:36 specialbrew kernel: [5138577.145789] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
Mar 26 13:53:36 specialbrew kernel: [5138577.154616] ata5.02: configured for UDMA/100
Mar 26 13:53:36 specialbrew kernel: [5138577.161849] ata5: EH complete
Mar 26 13:53:38 specialbrew kernel: [5138578.402262] ata5.03: failed command: WRITE FPDMA QUEUED
Mar 26 13:53:38 specialbrew kernel: [5138578.409516] ata5.03: cmd 61/d8:f0:a0:5b:11/00:00:00:00:00/40 tag 30 ncq 110592 out
Mar 26 13:53:38 specialbrew kernel: [5138578.409516]          res 99/d7:00:00:00:00/00:00:00:e0:99/00 Emask 0x2 (HSM violation)
Mar 26 13:53:38 specialbrew kernel: [5138578.424086] ata5.03: status: { Busy }
Mar 26 13:53:38 specialbrew kernel: [5138578.431389] ata5.03: error: { ICRC UNC AMNF IDNF ABRT }
Mar 26 13:53:38 specialbrew kernel: [5138578.438850] ata5.03: hard resetting link
Mar 26 13:53:38 specialbrew kernel: [5138578.765827] ata5.03: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
Mar 26 13:53:38 specialbrew kernel: [5138578.774446] ata5.03: configured for UDMA/100
Mar 26 13:53:38 specialbrew kernel: [5138578.781795] ata5: EH complete

Despite the masses of link resets a couple of times an hour it all seemed to be working still, and it was a few days before I looked into it further.

The hardware is an HP Microserver with a Sans Digital 8-bay SATA disk enclosure connected over 2x eSATA. The Microserver’s four internal SATA slots are used for something else; these messages relate to the two eSATA links (ata5 and ata6) to the disk enclosure. There’s seven disks in there, six of which form a btrfs filesystem which holds the majority of files we use here at home (yes, I’ve heard about ZFSonLinux. No, I’m not interested in using it yet).

I have never been too happy with that Sans Digital enclosure:

  • Half the LEDs on the front have never worked. So you only get link lights for one SATA link.
  • As a more general example of the above, the mechanical build quality just seems bad. It’s really flimsy.
  • It’s pretty slow to detect disks and spews errors in the dmesg as it does.
  • It’s done this thing before where it resets the SATA link over and over, but the problem mysteriously went away when everything was power-cycled.

So anyway, plan of action:

  1. Try rebooting everything.
  2. If no joy, buy a new enclosure from somewhere and try to make it not another one of those.

It was 30th March before I got around to giving that a go. There was a short period of terror where the Microserver abruptly declared

No boot device. Insert boot floppy.

but amusingly this turned out to be because the BIOS was set to prefer booting off a USB disk, and I had left my Sansa Clip plugged in to charge it. It was trying to boot off of an mp3 player.

Sadly once we did actually get past GruB things were not much happier. SATA links resetting pretty much continuously, to the point were it couldn’t even get to the end of Linux attaching the disks as SCSI devices. Unplugging the eSATA cables entirely left the Microserver happy to boot with no issues other than all my data being missing!

A process of elimination (take all disks out, boot, put disks back in one by one and boot each time until everything complains) allowed me to identify one particular disk that was really upsetting things. I was able to boot without that disk inserted, and I could mount the btrfs filesystem in degraded mode as it’s a RAID-1 for both data and metadata.

At this point I decided to push my luck and try inserting that one problematic disk again. As soon as I did it all went crazy again, and the link resets caused a bunch more devices to be ejected by Linux. I was left with a btrfs filesystem with three remaining devices that had mounted itself read-only due to read errors.

So, is it the disk or is the the enclosure?

I don’t have a spare enclosure so it’s rather difficult to stress test that, but bearing in mind that I’m not too happy with it anyway I decided to buy a new enclosure anyway and investigate the existing one later. This time I decided to try this thing, which appears to be a CFi-B7886CM. No I’ve never heard of them either but I doubt it is any different to what Sans Digital buy and slap their branding on.

It’s quite a bit cheaper than the Sans Digital unit, though obviously it only has one eSATA link. I’m not too bothered by that as I doubt that any four of my disks were exceeding 3Gbps or whatever, so yeah, whatever, I’ll put six disks on one link. It might even be a benefit if I want to add another one of these enclosures later, as there’s no more room in the Microserver for more eSATA cards.

While that was on order I got things back up and running with the five disks and had the btrfs filesystem running degraded (yes, I do have backups). I attached that suspect disk to another machine via a USB dock and was able to repeatedly read it all, perform SMART long tests on it without error, etc.

The disk caddies are almost identical, and are interchangeable.
The disk caddies are almost identical, and are interchangeable.

The new enclosure arrived today and my first impressions of it are fairly positive. In terms of appearance and dimensions it’s almost identical to the Sans Digital one. In fact the disk caddies look identical bar the colour of the plastic handle, and are interchangeable, which saved me the hassle of having to unscrew 28 screws (seven disks, four per disk) and screw them in again. It definitely feels bit more sturdy though.

On boot for some reason I expected the btrfs filesystem to not automatically mount. It had been running with a device missing for nearly two days, and in that state you have to do

# mount -odegraded /srv/tank

to get it to mount, so I was thinking that even with all disks inserted it would decide that the out-of-date disk was unacceptable and require manual intervention to mount it. Well, I was wrong about that. It automatically mounted it and then immediately started complaining:

Apr  1 14:46:14 specialbrew kernel: [  161.210994] BTRFS info (device sdj): csum failed ino 259 off 12288 csum 1424469249 expected csum 1836639932
Apr  1 14:46:14 specialbrew kernel: [  161.211321] BTRFS info (device sdj): csum failed ino 259 off 24576 csum 3532125205 expected csum 1877817807
Apr  1 14:46:19 specialbrew kernel: [  165.447070] verify_parent_transid: 9 callbacks suppressed
Apr  1 14:46:19 specialbrew kernel: [  165.457108] parent transid verify failed on 3438446813184 wanted 1144554 found 1141678
Apr  1 14:46:19 specialbrew kernel: [  165.468310] repair_io_failure: 16 callbacks suppressed
Apr  1 14:46:19 specialbrew kernel: [  165.478409] BTRFS: read error corrected: ino 1 off 3438446813184 (dev /dev/sdk sector 1525564240)
Apr  1 14:46:19 specialbrew kernel: [  165.491461] parent transid verify failed on 3438446821376 wanted 1144554 found 1141678
Apr  1 14:46:19 specialbrew kernel: [  165.501892] BTRFS: read error corrected: ino 1 off 3438446821376 (dev /dev/sdk sector 1525564256)
Apr  1 14:46:19 specialbrew kernel: [  165.512262] parent transid verify failed on 3438336446464 wanted 1144475 found 1141571
Apr  1 14:46:19 specialbrew kernel: [  165.522746] BTRFS: read error corrected: ino 1 off 3438336446464 (dev /dev/sdk sector 1525348680)
Apr  1 14:46:34 specialbrew kernel: [  180.411201] parent transid verify failed on 3892014911488 wanted 1144992 found 1142134
Apr  1 14:46:34 specialbrew kernel: [  180.422607] BTRFS: read error corrected: ino 1 off 3892014911488 (dev /dev/sdk sector 150856)
Apr  1 14:46:34 specialbrew kernel: [  180.442075] parent transid verify failed on 3892014706688 wanted 1144992 found 1142133
Apr  1 14:46:34 specialbrew kernel: [  180.453157] BTRFS: read error corrected: ino 1 off 3892014706688 (dev /dev/sdk sector 150456)
Apr  1 14:46:34 specialbrew kernel: [  180.475472] parent transid verify failed on 3892014710784 wanted 1144992 found 1142133
Apr  1 14:46:34 specialbrew kernel: [  180.486688] BTRFS: read error corrected: ino 1 off 3892014710784 (dev /dev/sdk sector 150464)
Apr  1 14:46:34 specialbrew kernel: [  180.508824] parent transid verify failed on 3892014714880 wanted 1144992 found 1142133
Apr  1 14:46:34 specialbrew kernel: [  180.519368] BTRFS: read error corrected: ino 1 off 3892014714880 (dev /dev/sdk sector 150472)
Apr  1 14:47:22 specialbrew kernel: [  229.019490] parent transid verify failed on 3438634471424 wanted 1144757 found 1141901
Apr  1 14:47:22 specialbrew kernel: [  229.056008] BTRFS: read error corrected: ino 1 off 3438634471424 (dev /dev/sdk sector 1525930760)
It's nice to have all the blinkenlights blinking.
It’s nice to have all the blinkenlights blinking.

This is apparently what you would normally expect from btrfs fixing the out-of-date metadata from the other copy.

Everything seems okay; there are no read errors and no more link resets, and a cursory inspection of important data is matching up with checksums from last good backup. Oh, and all the SATA link/activity LEDs work!

I have to now:

  • do a btrfs scrub to make sure all the data on sdk is correct.
  • investigate the Sans Digital enclosure to see if I can replicate its brokenness.
While we're at it, is there a brand of label tape that doesn't dry up and peel off?
While we’re at it, is there a brand of label tape that doesn’t dry up and peel off?

Electronically I can’t tell if it’s any different to the old enclosure (aside from only having one SATA link, not two).

Comparing the dmesg between “SCSI subsystem initialized” and the last SCSI disk being attached, for the old and the new enclosure I see a few interesting differences. The new one is a little bit faster, and has fewer weird errors (failed to IDENTIFY, etc.).

Old:

[    5.818389] ata5.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9

New:

[    8.116807] ata6.15: Port Multiplier 1.2, 0x197b:0x575f r0, 15 ports, feat 0x5/0xf

So the new one supports Port Multiplier v1.2 as opposed to v1.1. Presumably that is good news. I wonder what feat 0x1/0x9 vs feat 0x5/0xf means?

With the old enclosure the SATA links seem to come up as a mixture of 1.5 and 3.0Gbps, and multiple times as the links are reset:

[    3.510120] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.510209] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    3.510290] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.510359] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    5.818090] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[    6.138331] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[    6.458331] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    6.778330] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    7.738323] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   10.082066] ata5.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   10.402304] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   11.778298] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   12.098296] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   13.058294] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   15.406036] ata5.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   15.726279] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   16.046275] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   17.418267] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   18.378264] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   20.586006] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   20.906281] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   21.226248] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   21.866245] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   22.506241] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   24.869982] ata6.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   25.190226] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   26.546216] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   27.186212] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   27.826212] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   30.169952] ata6.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   30.490216] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   31.866187] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   32.506184] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   33.146180] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)

The new one, they’re all 6.0Gbps (although the eSATA link itself seems to only be 3Gbps; not sure why that would be but it’s no worse anyway):

[    3.509782] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513788] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513878] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513965] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    7.961748] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[    8.454063] ata6.00: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    8.822059] ata6.01: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.174057] ata6.02: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.510064] ata6.03: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.846061] ata6.04: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   10.182059] ata6.05: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   10.518057] ata6.06: SATA link up 6.0 Gbps (SStatus 133 SControl 300)

Hmm, probably should investigate why /dev/sd[a-d] all have their write cache disabled.

Update 2nd April:

The scrub seems to have gone okay:

scrub status for 472ee2b3-4dc3-4fc1-80bc-5ba967069ceb
scrub device /dev/sdh (id 2) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 14642 seconds
        total bytes scrubbed: 383.42GiB with 0 errors
scrub device /dev/sdg (id 3) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 14504 seconds
        total bytes scrubbed: 382.62GiB with 0 errors
scrub device /dev/sdf (id 4) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 14436 seconds
        total bytes scrubbed: 383.00GiB with 0 errors
scrub device /dev/sdk (id 5) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 21156 seconds
        total bytes scrubbed: 1.13TiB with 14530 errors
        error details: verify=10909 csum=3621
        corrected errors: 14530, uncorrectable errors: 0, unverified errors: 0
scrub device /dev/sdj (id 6) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 5693 seconds
        total bytes scrubbed: 119.42GiB with 0 errors
scrub device /dev/sde (id 7) history
        scrub started at Wed Apr  1 20:05:58 2015 and finished after 5282 seconds
        total bytes scrubbed: 114.45GiB with 0 errors

Those dmesg excerpts.

Old enclosure:

[    3.010635] SCSI subsystem initialized
[    3.013325] libata version 3.00 loaded.
[    3.014937] ahci 0000:00:11.0: version 3.0
[    3.015245] ahci 0000:00:11.0: irq 42 for MSI/MSI-X
[    3.015350] ahci 0000:00:11.0: AHCI 0001.0200 32 slots 4 ports 3 Gbps 0xf impl SATA mode
[    3.015413] ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part 
[    3.016613] scsi0 : ahci
[    3.017073] scsi1 : ahci
[    3.017527] scsi2 : ahci
[    3.017891] scsi3 : ahci
[    3.018071] ata1: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffd00 irq 42
[    3.018123] ata2: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffd80 irq 42
[    3.018174] ata3: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffe00 irq 42
[    3.018224] ata4: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffe80 irq 42
[    3.510120] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.510209] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    3.510290] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.510359] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.511393] ata3.00: ATA-8: ST3320418AS, CC38, max UDMA/133
[    3.511446] ata3.00: 625142448 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.512865] ata3.00: configured for UDMA/133
[    3.550857] ata2.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.550910] ata2.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.552655] ata4.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.552708] ata4.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.555002] ata1.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.555055] ata1.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.609166] ata2.00: configured for UDMA/133
[    3.610965] ata4.00: configured for UDMA/133
[    3.613304] ata1.00: configured for UDMA/133
[    3.613707] scsi 0:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.614932] scsi 1:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.615974] scsi 2:0:0:0: Direct-Access     ATA      ST3320418AS      CC38 PQ: 0 ANSI: 5
[    3.616662] scsi 3:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.619964] sata_sil24 0000:02:00.0: version 1.1
[    3.620839] scsi4 : sata_sil24
[    3.621229] scsi5 : sata_sil24
[    3.621391] ata5: SATA max UDMA/100 host m128@0xfe8ffc00 port 0xfe8f8000 irq 16
[    3.621446] ata6: SATA max UDMA/100 host m128@0xfe8ffc00 port 0xfe8fa000 irq 16
[    3.914252] Switched to clocksource tsc
[    5.818090] ata5: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[    5.818389] ata5.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
[    5.820283] ata5.00: hard resetting link
[    6.138331] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[    6.138411] ata5.01: hard resetting link
[    6.458331] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    6.458412] ata5.02: hard resetting link
[    6.778330] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    6.778409] ata5.03: hard resetting link
[    7.098325] ata5.03: SATA link down (SStatus 0 SControl 320)
[    7.098427] ata5.04: hard resetting link
[    7.418325] ata5.04: SATA link down (SStatus 0 SControl 320)
[    7.418427] ata5.05: hard resetting link
[    7.738323] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[    7.739205] ata5.00: ATA-8: ST2000DL003-9VT166, CC3C, max UDMA/133
[    7.739259] ata5.00: 3907029168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[    7.740177] ata5.00: configured for UDMA/100
[    7.850059] ata5.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[    7.850116] ata5.15: hard resetting link
[    7.850161] ata5: controller in dubious state, performing PORT_RST
[   10.082066] ata5.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   10.082368] ata5.00: hard resetting link
[   10.402304] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   11.458039] ata5.01: hard resetting link
[   11.778298] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   11.778378] ata5.02: hard resetting link
[   12.098296] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   12.738033] ata5.05: hard resetting link
[   13.058294] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   13.060046] ata5.00: configured for UDMA/100
[   13.061547] ata5.01: ATA-8: ST500DM002-1BD142, KC45, max UDMA/133
[   13.061600] ata5.01: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   13.063284] ata5.01: configured for UDMA/100
[   13.174029] ata5.02: failed to IDENTIFY (I/O error, err_mask=0x11)
[   13.174086] ata5.15: hard resetting link
[   13.174131] ata5: controller in dubious state, performing PORT_RST
[   15.406036] ata5.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   15.406340] ata5.00: hard resetting link
[   15.726279] ata5.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   15.726359] ata5.01: hard resetting link
[   16.046275] ata5.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   17.098013] ata5.02: hard resetting link
[   17.418267] ata5.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   17.418347] ata5.03: hard resetting link
[   17.738266] ata5.03: SATA link down (SStatus 0 SControl 320)
[   17.738371] ata5.04: hard resetting link
[   18.058262] ata5.04: SATA link down (SStatus 0 SControl 320)
[   18.058364] ata5.05: hard resetting link
[   18.378264] ata5.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   18.380014] ata5.00: configured for UDMA/100
[   18.383049] ata5.01: configured for UDMA/100
[   18.383981] ata5.02: ATA-8: ST2000DL003-9VT166, CC3C, max UDMA/133
[   18.384034] ata5.02: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   18.385025] ata5.02: configured for UDMA/100
[   18.385136] ata5: EH complete
[   18.385504] scsi 4:0:0:0: Direct-Access     ATA      ST2000DL003-9VT1 CC3C PQ: 0 ANSI: 5
[   18.386442] scsi 4:1:0:0: Direct-Access     ATA      ST500DM002-1BD14 KC45 PQ: 0 ANSI: 5
[   18.387336] scsi 4:2:0:0: Direct-Access     ATA      ST2000DL003-9VT1 CC3C PQ: 0 ANSI: 5
[   20.586006] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   20.586306] ata6.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
[   20.588209] ata6.00: hard resetting link
[   20.906281] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   20.906362] ata6.01: hard resetting link
[   21.226248] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   21.226328] ata6.02: hard resetting link
[   21.546245] ata6.02: SATA link down (SStatus 0 SControl 320)
[   21.546348] ata6.03: hard resetting link
[   21.866245] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   21.866326] ata6.04: hard resetting link
[   22.186243] ata6.04: SATA link down (SStatus 0 SControl 320)
[   22.186345] ata6.05: hard resetting link
[   22.506241] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   22.507044] ata6.00: ATA-8: ST2000DM001-1CH164, CC26, max UDMA/133
[   22.507097] ata6.00: 3907029168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[   22.526916] ata6.00: configured for UDMA/100
[   22.637976] ata6.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[   22.638033] ata6.15: hard resetting link
[   22.638077] ata6: controller in dubious state, performing PORT_RST
[   24.869982] ata6.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   24.870284] ata6.00: hard resetting link
[   25.190226] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   26.225956] ata6.01: hard resetting link
[   26.546216] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   26.865951] ata6.03: hard resetting link
[   27.186212] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   27.505948] ata6.05: hard resetting link
[   27.826212] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   27.828088] ata6.00: configured for UDMA/100
[   27.937960] ata6.01: failed to IDENTIFY (I/O error, err_mask=0x11)
[   27.938018] ata6.15: hard resetting link
[   27.938064] ata6: controller in dubious state, performing PORT_RST
[   30.169952] ata6.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[   30.170255] ata6.00: hard resetting link
[   30.490216] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[   31.545926] ata6.01: hard resetting link
[   31.866187] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   31.866267] ata6.02: hard resetting link
[   32.186183] ata6.02: SATA link down (SStatus 0 SControl 320)
[   32.186286] ata6.03: hard resetting link
[   32.506184] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[   32.506265] ata6.04: hard resetting link
[   32.826180] ata6.04: SATA link down (SStatus 0 SControl 320)
[   32.826283] ata6.05: hard resetting link
[   33.146180] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[   33.148097] ata6.00: configured for UDMA/100
[   33.149175] ata6.01: ATA-8: ST2000DM001-1CH164, CC26, max UDMA/133
[   33.149232] ata6.01: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   33.150077] ata6.01: configured for UDMA/100
[   33.150673] ata6.03: ATA-9: WDC WD30EZRX-00D8PB0, 80.00A80, max UDMA/133
[   33.151349] ata6.03: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   33.151980] ata6.03: configured for UDMA/100
[   33.152091] ata6: EH complete
[   33.152449] scsi 5:0:0:0: Direct-Access     ATA      ST2000DM001-1CH1 CC26 PQ: 0 ANSI: 5
[   33.153351] scsi 5:1:0:0: Direct-Access     ATA      ST2000DM001-1CH1 CC26 PQ: 0 ANSI: 5
[   33.154294] scsi 5:3:0:0: Direct-Access     ATA      WDC WD30EZRX-00D 0A80 PQ: 0 ANSI: 5
[   33.159340] udevd[79]: starting version 175
[   33.279358] pps_core: LinuxPPS API ver. 1 registered
[   33.279447] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[   33.281013] PTP clock support registered
[   33.288070] tg3.c:v3.137 (May 11, 2014)
[   33.305489] ACPI: bus type USB registered
[   33.305628] usbcore: registered new interface driver usbfs
[   33.305692] usbcore: registered new interface driver hub
[   33.334492] sd 2:0:0:0: [sdc] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[   33.334600] sd 1:0:0:0: [sdb] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   33.334663] sd 4:0:0:0: [sde] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   33.334713] sd 4:0:0:0: [sde] 4096-byte physical blocks
[   33.334769] sd 3:0:0:0: [sdd] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   33.334851] sd 0:0:0:0: [sda] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   33.335019] sd 1:0:0:0: [sdb] Write Protect is off
[   33.335071] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[   33.335654] sd 3:0:0:0: [sdd] Write Protect is off
[   33.335738] sd 3:0:0:0: [sdd] Mode Sense: 00 3a 00 00
[   33.335805] sd 0:0:0:0: [sda] Write Protect is off
[   33.335851] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[   33.335931] sd 2:0:0:0: [sdc] Write Protect is off
[   33.335981] sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[   33.335997] sd 4:0:0:0: [sde] Write Protect is off
[   33.336043] sd 4:0:0:0: [sde] Mode Sense: 00 3a 00 00
[   33.336072] sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   33.336272] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   33.336430] sd 4:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.336549] sd 3:0:0:0: [sdd] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   33.336657] sd 2:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   33.338151] usbcore: registered new device driver usb
[   33.338392] sd 4:1:0:0: [sdf] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[   33.338448] sd 4:1:0:0: [sdf] 4096-byte physical blocks
[   33.338556] sd 4:1:0:0: [sdf] Write Protect is off
[   33.338602] sd 4:1:0:0: [sdf] Mode Sense: 00 3a 00 00
[   33.338631] sd 4:1:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.340427] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[   33.340790] ehci-pci: EHCI PCI platform driver
[   33.341526] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[   33.341963] ohci-pci: OHCI PCI platform driver
[   33.343818]  sdf: unknown partition table
[   33.344181] sd 4:1:0:0: [sdf] Attached SCSI disk
[   33.344271] sd 4:2:0:0: [sdg] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   33.344322] sd 4:2:0:0: [sdg] 4096-byte physical blocks
[   33.344424] sd 4:2:0:0: [sdg] Write Protect is off
[   33.344470] sd 4:2:0:0: [sdg] Mode Sense: 00 3a 00 00
[   33.344497] sd 4:2:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.348760]  sdc: sdc1 sdc2 sdc3
[   33.348907] scsi6 : pata_atiixp
[   33.349487] sd 2:0:0:0: [sdc] Attached SCSI disk
[   33.349615] sd 5:0:0:0: [sdh] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   33.349674] sd 5:0:0:0: [sdh] 4096-byte physical blocks
[   33.349777] sd 5:0:0:0: [sdh] Write Protect is off
[   33.349892] sd 5:0:0:0: [sdh] Mode Sense: 00 3a 00 00
[   33.349928] sd 5:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.351467] sd 5:1:0:0: [sdi] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   33.351562] sd 5:1:0:0: [sdi] 4096-byte physical blocks
[   33.351659] sd 5:1:0:0: [sdi] Write Protect is off
[   33.351707] sd 5:1:0:0: [sdi] Mode Sense: 00 3a 00 00
[   33.351731] sd 5:1:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.354852]  sdb: sdb1 sdb2 sdb3
[   33.355394] sd 1:0:0:0: [sdb] Attached SCSI disk
[   33.355517] sd 5:3:0:0: [sdj] 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)
[   33.355570] sd 5:3:0:0: [sdj] 4096-byte physical blocks
[   33.355687] sd 5:3:0:0: [sdj] Write Protect is off
[   33.355746] sd 5:3:0:0: [sdj] Mode Sense: 00 3a 00 00
[   33.355774] sd 5:3:0:0: [sdj] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   33.356077]  sdd: sdd1 sdd2 sdd3
[   33.356565] sd 3:0:0:0: [sdd] Attached SCSI disk
[   33.356772]  sde: unknown partition table
[   33.357024] sd 4:0:0:0: [sde] Attached SCSI disk
[   33.358014]  sda: sda1 sda2 sda3
[   33.358470] sd 0:0:0:0: [sda] Attached SCSI disk
[   33.360879] sd 0:0:0:0: Attached scsi generic sg0 type 0
[   33.361384] sd 1:0:0:0: Attached scsi generic sg1 type 0
[   33.361524] sd 2:0:0:0: Attached scsi generic sg2 type 0
[   33.362055] sd 3:0:0:0: Attached scsi generic sg3 type 0
[   33.362192] random: nonblocking pool is initialized
[   33.362992]  sdg: unknown partition table
[   33.363064] sd 4:0:0:0: Attached scsi generic sg4 type 0
[   33.363217] sd 4:1:0:0: Attached scsi generic sg5 type 0
[   33.363425] sd 4:2:0:0: [sdg] Attached SCSI disk
[   33.363684] sd 4:2:0:0: Attached scsi generic sg6 type 0
[   33.364163] sd 5:0:0:0: Attached scsi generic sg7 type 0
[   33.364262] scsi7 : pata_atiixp
[   33.364414] ata7: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14
[   33.364482] ata8: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15
[   33.364779] sd 5:1:0:0: Attached scsi generic sg8 type 0
[   33.364816] QUIRK: Enable AMD PLL fix
[   33.364856] ehci-pci 0000:00:12.2: EHCI Host Controller
[   33.364916] ehci-pci 0000:00:12.2: new USB bus registered, assigned bus number 1
[   33.364973] ehci-pci 0000:00:12.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   33.365035] ehci-pci 0000:00:12.2: debug port 1
[   33.365143] ehci-pci 0000:00:12.2: irq 17, io mem 0xfe5ff800
[   33.365218] sd 5:3:0:0: Attached scsi generic sg9 type 0
[   33.372701] tg3 0000:03:00.0 eth0: Tigon3 [partno(BCM95723) rev 5784100] (PCI Express) MAC address d4:85:64:c9:e6:24
[   33.372767] tg3 0000:03:00.0 eth0: attached PHY is 5784 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[0])
[   33.372820] tg3 0000:03:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[   33.372870] tg3 0000:03:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[   33.373201]  sdh: unknown partition table
[   33.373555] sd 5:0:0:0: [sdh] Attached SCSI disk
[   33.373944] ehci-pci 0000:00:12.2: USB 2.0 started, EHCI 1.00
[   33.374071] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[   33.374119] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.374169] usb usb1: Product: EHCI Host Controller
[   33.374214] usb usb1: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   33.374260] usb usb1: SerialNumber: 0000:00:12.2
[   33.374691] hub 1-0:1.0: USB hub found
[   33.374781] hub 1-0:1.0: 5 ports detected
[   33.375334] ehci-pci 0000:00:13.2: EHCI Host Controller
[   33.375390] ehci-pci 0000:00:13.2: new USB bus registered, assigned bus number 2
[   33.375449] ehci-pci 0000:00:13.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   33.375512] ehci-pci 0000:00:13.2: debug port 1
[   33.375607] ehci-pci 0000:00:13.2: irq 17, io mem 0xfe5ff400
[   33.376656]  sdi: unknown partition table
[   33.377076] sd 5:1:0:0: [sdi] Attached SCSI disk
[   33.385906] ehci-pci 0000:00:13.2: USB 2.0 started, EHCI 1.00
[   33.386167] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[   33.386220] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.386270] usb usb2: Product: EHCI Host Controller
[   33.386316] usb usb2: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   33.386362] usb usb2: SerialNumber: 0000:00:13.2
[   33.387005] hub 2-0:1.0: USB hub found
[   33.387265] hub 2-0:1.0: 5 ports detected
[   33.387879] ehci-pci 0000:00:16.2: EHCI Host Controller
[   33.387933] ehci-pci 0000:00:16.2: new USB bus registered, assigned bus number 3
[   33.387986] ehci-pci 0000:00:16.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   33.388049] ehci-pci 0000:00:16.2: debug port 1
[   33.388139] ehci-pci 0000:00:16.2: irq 17, io mem 0xfe5ff000
[   33.397878] ehci-pci 0000:00:16.2: USB 2.0 started, EHCI 1.00
[   33.398037] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002
[   33.398090] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.398142] usb usb3: Product: EHCI Host Controller
[   33.398188] usb usb3: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   33.398234] usb usb3: SerialNumber: 0000:00:16.2
[   33.398551] hub 3-0:1.0: USB hub found
[   33.398615] hub 3-0:1.0: 4 ports detected
[   33.399512] ohci-pci 0000:00:12.0: OHCI PCI host controller
[   33.399567] ohci-pci 0000:00:12.0: new USB bus registered, assigned bus number 4
[   33.399666] ohci-pci 0000:00:12.0: irq 18, io mem 0xfe5fe000
[   33.458012] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001
[   33.458069] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.458122] usb usb4: Product: OHCI PCI host controller
[   33.458167] usb usb4: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   33.458214] usb usb4: SerialNumber: 0000:00:12.0
[   33.458798] hub 4-0:1.0: USB hub found
[   33.458864] hub 4-0:1.0: 5 ports detected
[   33.459403] ohci-pci 0000:00:13.0: OHCI PCI host controller
[   33.460079] ohci-pci 0000:00:13.0: new USB bus registered, assigned bus number 5
[   33.460173] ohci-pci 0000:00:13.0: irq 18, io mem 0xfe5fd000
[   33.517983] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001
[   33.518039] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.518093] usb usb5: Product: OHCI PCI host controller
[   33.518142] usb usb5: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   33.518212] usb usb5: SerialNumber: 0000:00:13.0
[   33.519228] hub 5-0:1.0: USB hub found
[   33.519291] hub 5-0:1.0: 5 ports detected
[   33.519871] ohci-pci 0000:00:16.0: OHCI PCI host controller
[   33.519946] ohci-pci 0000:00:16.0: new USB bus registered, assigned bus number 6
[   33.520048] ohci-pci 0000:00:16.0: irq 18, io mem 0xfe5fc000
[   33.577996] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001
[   33.578054] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   33.578105] usb usb6: Product: OHCI PCI host controller
[   33.578151] usb usb6: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   33.578198] usb usb6: SerialNumber: 0000:00:16.0
[   33.578570] hub 6-0:1.0: USB hub found
[   33.578635] hub 6-0:1.0: 4 ports detected
[   34.261707]  sdj: unknown partition table
[   34.262244] sd 5:3:0:0: [sdj] Attached SCSI disk

And with the new enclosure:

[    3.014000] SCSI subsystem initialized
[    3.016739] libata version 3.00 loaded.
[    3.018309] ahci 0000:00:11.0: version 3.0
[    3.018588] ahci 0000:00:11.0: irq 42 for MSI/MSI-X
[    3.018684] ahci 0000:00:11.0: AHCI 0001.0200 32 slots 4 ports 3 Gbps 0xf impl SATA mode
[    3.018742] ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part 
[    3.019841] scsi0 : ahci
[    3.020241] scsi1 : ahci
[    3.020705] scsi2 : ahci
[    3.021119] scsi3 : ahci
[    3.021317] ata1: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffd00 irq 42
[    3.021372] ata2: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffd80 irq 42
[    3.021427] ata3: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffe00 irq 42
[    3.021479] ata4: SATA max UDMA/133 abar m1024@0xfe5ffc00 port 0xfe5ffe80 irq 42
[    3.509782] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513788] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513878] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    3.513965] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    3.515180] ata3.00: ATA-8: ST3320418AS, CC38, max UDMA/133
[    3.515233] ata3.00: 625142448 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.516651] ata3.00: configured for UDMA/133
[    3.554413] ata1.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.554466] ata1.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.554593] ata2.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.554639] ata2.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.557219] ata4.00: ATA-7: ST3320620AS, 3.AAC, max UDMA/133
[    3.557272] ata4.00: 625134827 sectors, multi 0: LBA48 NCQ (depth 31/32)
[    3.612719] ata1.00: configured for UDMA/133
[    3.612949] ata2.00: configured for UDMA/133
[    3.613000] scsi 0:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.613707] scsi 1:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.614554] scsi 2:0:0:0: Direct-Access     ATA      ST3320418AS      CC38 PQ: 0 ANSI: 5
[    3.615496] ata4.00: configured for UDMA/133
[    3.615739] scsi 3:0:0:0: Direct-Access     ATA      ST3320620AS      C    PQ: 0 ANSI: 5
[    3.619004] sata_sil24 0000:02:00.0: version 1.1
[    3.619834] scsi4 : sata_sil24
[    3.620237] scsi5 : sata_sil24
[    3.620414] ata5: SATA max UDMA/100 host m128@0xfe8ffc00 port 0xfe8f8000 irq 16
[    3.620468] ata6: SATA max UDMA/100 host m128@0xfe8ffc00 port 0xfe8fa000 irq 16
[    3.921925] Switched to clocksource tsc
[    5.697760] ata5: SATA link down (SStatus 0 SControl 0)
[    7.961748] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[    8.116807] ata6.15: Port Multiplier 1.2, 0x197b:0x575f r0, 15 ports, feat 0x5/0xf
[    8.119113] ata6.00: hard resetting link
[    8.454063] ata6.00: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    8.454167] ata6.01: hard resetting link
[    8.822059] ata6.01: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    8.822162] ata6.02: hard resetting link
[    9.174057] ata6.02: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.174160] ata6.03: hard resetting link
[    9.510064] ata6.03: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.510168] ata6.04: hard resetting link
[    9.846061] ata6.04: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    9.846165] ata6.05: hard resetting link
[   10.182059] ata6.05: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   10.182164] ata6.06: hard resetting link
[   10.518057] ata6.06: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[   10.518162] ata6.07: hard resetting link
[   10.838099] ata6.07: SATA link down (SStatus 0 SControl 320)
[   10.838219] ata6.08: hard resetting link
[   11.158095] ata6.08: SATA link down (SStatus 0 SControl 320)
[   11.158213] ata6.09: hard resetting link
[   11.478093] ata6.09: SATA link down (SStatus 0 SControl 320)
[   11.478212] ata6.10: hard resetting link
[   11.798094] ata6.10: SATA link down (SStatus 0 SControl 320)
[   11.798214] ata6.11: hard resetting link
[   12.118088] ata6.11: SATA link down (SStatus 0 SControl 320)
[   12.118208] ata6.12: hard resetting link
[   12.438091] ata6.12: SATA link down (SStatus 0 SControl 320)
[   12.438209] ata6.13: hard resetting link
[   12.758087] ata6.13: SATA link down (SStatus 0 SControl 320)
[   12.758206] ata6.14: hard resetting link
[   13.078082] ata6.14: SATA link down (SStatus 0 SControl 320)
[   13.078746] ata6.00: ATA-9: WDC WD30EZRX-00D8PB0, 80.00A80, max UDMA/133
[   13.078802] ata6.00: 5860533168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[   13.079454] ata6.00: configured for UDMA/100
[   13.083304] ata6.01: ATA-8: ST2000DM001-1CH164, CC26, max UDMA/133
[   13.083357] ata6.01: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   17.852068] ata6.01: configured for UDMA/100
[   17.855904] ata6.02: ATA-8: ST2000DM001-1CH164, CC26, max UDMA/133
[   17.855957] ata6.02: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   22.590353] ata6.02: configured for UDMA/100
[   22.596782] ata6.03: ATA-8: ST2000DL003-9VT166, CC3C, max UDMA/133
[   22.596838] ata6.03: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   22.614183] ata6.03: configured for UDMA/100
[   22.616206] ata6.04: ATA-8: ST500DM002-1BD142, KC45, max UDMA/133
[   22.616259] ata6.04: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   22.640259] ata6.04: configured for UDMA/100
[   22.646640] ata6.05: ATA-8: ST2000DL003-9VT166, CC3C, max UDMA/133
[   22.646693] ata6.05: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   22.664004] ata6.05: configured for UDMA/100
[   22.664550] ata6.06: ATA-9: WDC WD30EZRX-00D8PB0, 80.00A80, max UDMA/133
[   22.664603] ata6.06: 5860533168 sectors, multi 0: LBA48 NCQ (depth 31/32)
[   22.665186] ata6.06: configured for UDMA/100
[   22.665437] ata6: EH complete
[   22.665865] scsi 5:0:0:0: Direct-Access     ATA      WDC WD30EZRX-00D 0A80 PQ: 0 ANSI: 5
[   22.666964] scsi 5:1:0:0: Direct-Access     ATA      ST2000DM001-1CH1 CC26 PQ: 0 ANSI: 5
[   22.668009] scsi 5:2:0:0: Direct-Access     ATA      ST2000DM001-1CH1 CC26 PQ: 0 ANSI: 5
[   22.668589] scsi 5:3:0:0: Direct-Access     ATA      ST2000DL003-9VT1 CC3C PQ: 0 ANSI: 5
[   22.669046] scsi 5:4:0:0: Direct-Access     ATA      ST500DM002-1BD14 KC45 PQ: 0 ANSI: 5
[   22.669519] scsi 5:5:0:0: Direct-Access     ATA      ST2000DL003-9VT1 CC3C PQ: 0 ANSI: 5
[   22.669972] scsi 5:6:0:0: Direct-Access     ATA      WDC WD30EZRX-00D 0A80 PQ: 0 ANSI: 5
[   22.674753] udevd[79]: starting version 175
[   22.718011] pps_core: LinuxPPS API ver. 1 registered
[   22.718099] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[   22.718474] PTP clock support registered
[   22.723563] tg3.c:v3.137 (May 11, 2014)
[   22.779806] tg3 0000:03:00.0 eth0: Tigon3 [partno(BCM95723) rev 5784100] (PCI Express) MAC address d4:85:64:c9:e6:24
[   22.779903] tg3 0000:03:00.0 eth0: attached PHY is 5784 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[0])
[   22.779956] tg3 0000:03:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
[   22.780009] tg3 0000:03:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[   22.781303] ACPI: bus type USB registered
[   22.781448] usbcore: registered new interface driver usbfs
[   22.781515] usbcore: registered new interface driver hub
[   22.808386] usbcore: registered new device driver usb
[   22.809764] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[   22.810453] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[   22.810686] ehci-pci: EHCI PCI platform driver
[   22.810872] ohci-pci: OHCI PCI platform driver
[   22.823167] scsi6 : pata_atiixp
[   22.832627] sd 1:0:0:0: [sdb] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   22.832785] sd 1:0:0:0: [sdb] Write Protect is off
[   22.832834] sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
[   22.832863] sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   22.833349] sd 2:0:0:0: [sdc] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[   22.833402] sd 5:0:0:0: [sde] 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)
[   22.833404] sd 5:0:0:0: [sde] 4096-byte physical blocks
[   22.833417] sd 3:0:0:0: [sdd] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   22.833504] sd 5:0:0:0: [sde] Write Protect is off
[   22.833507] sd 5:0:0:0: [sde] Mode Sense: 00 3a 00 00
[   22.833517] sd 3:0:0:0: [sdd] Write Protect is off
[   22.833520] sd 3:0:0:0: [sdd] Mode Sense: 00 3a 00 00
[   22.833564] sd 5:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.833642] sd 3:0:0:0: [sdd] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   22.833777] sd 0:0:0:0: [sda] 625134827 512-byte logical blocks: (320 GB/298 GiB)
[   22.834163] sd 0:0:0:0: [sda] Write Protect is off
[   22.834212] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[   22.834241] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   22.835054] sd 2:0:0:0: [sdc] Write Protect is off
[   22.835101] sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[   22.835130] sd 2:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   22.845520]  sdc: sdc1 sdc2 sdc3
[   22.846184] sd 2:0:0:0: [sdc] Attached SCSI disk
[   22.846305] sd 5:1:0:0: [sdf] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   22.846356] sd 5:1:0:0: [sdf] 4096-byte physical blocks
[   22.846455] sd 5:1:0:0: [sdf] Write Protect is off
[   22.846501] sd 5:1:0:0: [sdf] Mode Sense: 00 3a 00 00
[   22.846528] sd 5:1:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.850755] sd 5:2:0:0: [sdg] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   22.850849] sd 5:2:0:0: [sdg] 4096-byte physical blocks
[   22.850953] sd 5:2:0:0: [sdg] Write Protect is off
[   22.850999] sd 5:2:0:0: [sdg] Mode Sense: 00 3a 00 00
[   22.851026] sd 5:2:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.853444]  sda: sda1 sda2 sda3
[   22.854098]  sdb: sdb1 sdb2 sdb3
[   22.854559] sd 1:0:0:0: [sdb] Attached SCSI disk
[   22.854682] sd 5:3:0:0: [sdh] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   22.854738] sd 5:3:0:0: [sdh] 4096-byte physical blocks
[   22.854832] sd 0:0:0:0: [sda] Attached SCSI disk
[   22.854955] sd 5:4:0:0: [sdi] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[   22.855008] sd 5:4:0:0: [sdi] 4096-byte physical blocks
[   22.855069] sd 5:3:0:0: [sdh] Write Protect is off
[   22.855118] sd 5:3:0:0: [sdh] Mode Sense: 00 3a 00 00
[   22.855174] sd 5:3:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.855303]  sdf: unknown partition table
[   22.855502] sd 5:4:0:0: [sdi] Write Protect is off
[   22.855554] sd 5:4:0:0: [sdi] Mode Sense: 00 3a 00 00
[   22.855666] sd 5:4:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.855884] sd 5:1:0:0: [sdf] Attached SCSI disk
[   22.856103] sd 5:5:0:0: [sdj] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
[   22.856154] sd 5:5:0:0: [sdj] 4096-byte physical blocks
[   22.856354]  sdd: sdd1 sdd2 sdd3
[   22.856791] sd 3:0:0:0: [sdd] Attached SCSI disk
[   22.856903] sd 5:6:0:0: [sdk] 5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)
[   22.856954] sd 5:6:0:0: [sdk] 4096-byte physical blocks
[   22.857051] sd 5:6:0:0: [sdk] Write Protect is off
[   22.857097] sd 5:6:0:0: [sdk] Mode Sense: 00 3a 00 00
[   22.857123] sd 5:6:0:0: [sdk] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.857453] sd 5:5:0:0: [sdj] Write Protect is off
[   22.857504] sd 5:5:0:0: [sdj] Mode Sense: 00 3a 00 00
[   22.857542] sd 5:5:0:0: [sdj] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   22.861699] sd 0:0:0:0: Attached scsi generic sg0 type 0
[   22.864256] scsi7 : pata_atiixp
[   22.864427] ata7: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14
[   22.864479] ata8: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15
[   22.864823] QUIRK: Enable AMD PLL fix
[   22.864866] ehci-pci 0000:00:12.2: EHCI Host Controller
[   22.864921] ehci-pci 0000:00:12.2: new USB bus registered, assigned bus number 1
[   22.864979] ehci-pci 0000:00:12.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   22.865041] ehci-pci 0000:00:12.2: debug port 1
[   22.865148] ehci-pci 0000:00:12.2: irq 17, io mem 0xfe5ff800
[   22.865331]  sdg: unknown partition table
[   22.865675] sd 5:2:0:0: [sdg] Attached SCSI disk
[   22.868644] sd 1:0:0:0: Attached scsi generic sg1 type 0
[   22.869290] sd 2:0:0:0: Attached scsi generic sg2 type 0
[   22.869628] sd 3:0:0:0: Attached scsi generic sg3 type 0
[   22.871473] sd 5:0:0:0: Attached scsi generic sg4 type 0
[   22.872143] sd 5:1:0:0: Attached scsi generic sg5 type 0
[   22.872544] sd 5:2:0:0: Attached scsi generic sg6 type 0
[   22.872889] sd 5:3:0:0: Attached scsi generic sg7 type 0
[   22.873228] sd 5:4:0:0: Attached scsi generic sg8 type 0
[   22.873605] ehci-pci 0000:00:12.2: USB 2.0 started, EHCI 1.00
[   22.873738] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[   22.873786] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   22.873836] usb usb1: Product: EHCI Host Controller
[   22.873881] usb usb1: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   22.873927] usb usb1: SerialNumber: 0000:00:12.2
[   22.874176] hub 1-0:1.0: USB hub found
[   22.874237] hub 1-0:1.0: 5 ports detected
[   22.874799] ehci-pci 0000:00:13.2: EHCI Host Controller
[   22.874853] ehci-pci 0000:00:13.2: new USB bus registered, assigned bus number 2
[   22.874908] ehci-pci 0000:00:13.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   22.874970] ehci-pci 0000:00:13.2: debug port 1
[   22.875060] ehci-pci 0000:00:13.2: irq 17, io mem 0xfe5ff400
[   22.875304] sd 5:5:0:0: Attached scsi generic sg9 type 0
[   22.875734] sd 5:6:0:0: Attached scsi generic sg10 type 0
[   22.885688] ehci-pci 0000:00:13.2: USB 2.0 started, EHCI 1.00
[   22.885832] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[   22.885885] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   22.885935] usb usb2: Product: EHCI Host Controller
[   22.885981] usb usb2: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   22.886028] usb usb2: SerialNumber: 0000:00:13.2
[   22.886291] hub 2-0:1.0: USB hub found
[   22.886350] hub 2-0:1.0: 5 ports detected
[   22.886918] ehci-pci 0000:00:16.2: EHCI Host Controller
[   22.886972] ehci-pci 0000:00:16.2: new USB bus registered, assigned bus number 3
[   22.887028] ehci-pci 0000:00:16.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround
[   22.887090] ehci-pci 0000:00:16.2: debug port 1
[   22.887185] ehci-pci 0000:00:16.2: irq 17, io mem 0xfe5ff000
[   22.897569] ehci-pci 0000:00:16.2: USB 2.0 started, EHCI 1.00
[   22.897730] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002
[   22.897783] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   22.897836] usb usb3: Product: EHCI Host Controller
[   22.897883] usb usb3: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ehci_hcd
[   22.897932] usb usb3: SerialNumber: 0000:00:16.2
[   22.898214] hub 3-0:1.0: USB hub found
[   22.898272] hub 3-0:1.0: 4 ports detected
[   22.898847] ohci-pci 0000:00:12.0: OHCI PCI host controller
[   22.898914] ohci-pci 0000:00:12.0: new USB bus registered, assigned bus number 4
[   22.899017] ohci-pci 0000:00:12.0: irq 18, io mem 0xfe5fe000
[   22.957744] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001
[   22.957823] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   22.957874] usb usb4: Product: OHCI PCI host controller
[   22.957920] usb usb4: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   22.957966] usb usb4: SerialNumber: 0000:00:12.0
[   22.958434] hub 4-0:1.0: USB hub found
[   22.958495] hub 4-0:1.0: 5 ports detected
[   22.959085] ohci-pci 0000:00:13.0: OHCI PCI host controller
[   22.959142] ohci-pci 0000:00:13.0: new USB bus registered, assigned bus number 5
[   22.959237] ohci-pci 0000:00:13.0: irq 18, io mem 0xfe5fd000
[   22.972654] random: nonblocking pool is initialized
[   23.018494] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001
[   23.018554] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   23.018605] usb usb5: Product: OHCI PCI host controller
[   23.018650] usb usb5: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   23.018698] usb usb5: SerialNumber: 0000:00:13.0
[   23.019240] hub 5-0:1.0: USB hub found
[   23.019342] hub 5-0:1.0: 5 ports detected
[   23.019877] ohci-pci 0000:00:16.0: OHCI PCI host controller
[   23.019935] ohci-pci 0000:00:16.0: new USB bus registered, assigned bus number 6
[   23.020023] ohci-pci 0000:00:16.0: irq 18, io mem 0xfe5fc000
[   23.081765] usb usb6: New USB device found, idVendor=1d6b, idProduct=0001
[   23.081821] usb usb6: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   23.081871] usb usb6: Product: OHCI PCI host controller
[   23.081917] usb usb6: Manufacturer: Linux 3.16.0-0.bpo.4-amd64 ohci_hcd
[   23.081962] usb usb6: SerialNumber: 0000:00:16.0
[   23.082344] hub 6-0:1.0: USB hub found
[   23.082408] hub 6-0:1.0: 4 ports detected
[   23.785682] usb 4-2: new low-speed USB device number 2 using ohci-pci
[   23.967768] usb 4-2: New USB device found, idVendor=04d9, idProduct=1503
[   23.967824] usb 4-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   23.967871] usb 4-2: Product: USB Keyboard
[   23.967915] usb 4-2: Manufacturer:  
[   23.973497] hidraw: raw HID events driver (C) Jiri Kosina
[   24.003112] usbcore: registered new interface driver usbhid
[   24.003200] usbhid: USB HID core driver
[   24.006819] input:   USB Keyboard as /devices/pci0000:00/0000:00:12.0/usb4/4-2/4-2:1.0/0003:04D9:1503.0001/input/input0
[   24.006968] hid-generic 0003:04D9:1503.0001: input,hidraw0: USB HID v1.10 Keyboard [  USB Keyboard] on usb-0000:00:12.0-2/input0
[   24.011935] input:   USB Keyboard as /devices/pci0000:00/0000:00:12.0/usb4/4-2/4-2:1.1/0003:04D9:1503.0002/input/input1
[   24.012130] hid-generic 0003:04D9:1503.0002: input,hidraw1: USB HID v1.10 Device [  USB Keyboard] on usb-0000:00:12.0-2/input1
[   24.233688] usb 4-5: new full-speed USB device number 3 using ohci-pci
[   24.400767] usb 4-5: New USB device found, idVendor=067b, idProduct=2303
[   24.400821] usb 4-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   24.400869] usb 4-5: Product: USB-Serial Controller
[   24.400914] usb 4-5: Manufacturer: Prolific Technology Inc.
[   30.567918]  sdh: unknown partition table
[   30.568200]  sdj: unknown partition table
[   30.568393]  sdi: unknown partition table
[   30.569631] sd 5:4:0:0: [sdi] Attached SCSI disk
[   30.570218]  sde: unknown partition table
[   30.570481]  sdk: unknown partition table
[   30.571689] sd 5:5:0:0: [sdj] Attached SCSI disk
[   30.571875] sd 5:6:0:0: [sdk] Attached SCSI disk
[   30.572689] sd 5:3:0:0: [sdh] Attached SCSI disk
[   30.572778] sd 5:0:0:0: [sde] Attached SCSI disk

3 thoughts on “Home file server / disk enclosure troubles

  1. @DG, hah 🙂

    I haven’t had much trouble from btrfs but I only dare use it at home. I think there are still some big issues with it that prevent me from using it in more demanding environments.

    A big one is performance: I know a hardware RAID-10 is going to have predictable performance; it will have near to the combined IOPs of all devices on a streaming read since the data will be striped across them all.

    But on btrfs it’s not like that. Both RAID-1 and RAID-10 aren’t really RAID-1 or RAID-10 as we know it. In btrfs both of them just store an extra copy on another device, any device. There is no way to know which device ahead of time like you can with a RAID that has fixed layout.

    So while a real RAID controller can know that to construct a read from A B and C it can go to three different devices for these and get them all in parallel, btrfs doesn’t know that and in fact may find all of that data on the same device. It doesn’t try to find the different copies on different devices.

    ZFS is no better in this regard. The traditional answer there is to do layered storage and use SSDs as caching devices to make everything faster.

    That doesn’t yet work on btrfs. btrfs treats all devices the same.

    So… I am waiting for either an advance in the device selection (I think this is too hard and a violation of their design, so won’t happen) or an advance in Linux’s block device caching technologies. That second one is what I think will happen first.

    I’ve been following dm-cache and bcache with interest. They both seem too terrifying and complex. Now there is lvmcache though, which is a convenience wrapper for dm-cache. That looks much simpler and I’m excited for the time that I trust it enough:

    http://blog-vpodzime.rhcloud.com/?p=45

  2. Yeah – I saw you mention lvmcache/bcache before – they’re both interesting.

    I’ve been using btrfs in production – but not at a large scale (in terms of volume size or concurrent load). I’ve hit a few bugs with it.

    The snapshot feature is really appealing – but don’t turn on quota groups with it (which you need to find disk usage) unless you’re on a very new kernel, else you’ll see kernel panics.

    I’ve seen it fail under high load, report it’s full when ‘df’ etc shows it’s fine (needs a re-balance etc).

    It has plenty of promise at least …

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