ZFS and DMA read error

Mon Aug 31 06:52:38 UTC 2009

Good day to you,

I'm having a bit of trouble with one of the disks in my zfs raidz1 pool.
It's giving me dma read error, and zpool is reporting READ failures.
However, data integrity is OK :-)
Unfortunately I was in the middle of rearranging my backup media, so I'm
backup up everything as we speak.
I will be testing the failing drive in another computer soon, however
before I return it i'd like to know if this could be caused my something
other than hardware failing.
Below the output of "zpool status" and a snippet of /var/log/messages
showing the DMA errors.
Thanks for the input.
Greetz,
Mark

pool: data
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://www.sun.com/msg/ZFS-8000-9P
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        data        ONLINE       0     0     0
          raidz1    ONLINE       0     0     0
            ad4     ONLINE       0     0     0
            ad6     ONLINE      21     0     0
            ad8     ONLINE       0     0     0
            ad10    ONLINE       0     0     0

errors: No known data errors

Aug 31 03:04:35 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 03:04:35 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 03:04:35 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204925440 size=2560 error=5
Aug 31 03:04:53 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 03:04:53 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 03:05:17 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 03:05:17 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 03:05:17 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204918272 size=512 error=5
Aug 31 06:12:01 yoshi login: ROOT LOGIN (root) ON ttyv2
Aug 31 06:35:34 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:35:34 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:35:34 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204925440 size=2560 error=5
Aug 31 06:36:33 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:36:34 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:36:34 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204923392 size=2048 error=5
Aug 31 06:36:38 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:36:38 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:36:38 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204918272 size=512 error=5
Aug 31 06:36:42 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:36:42 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:36:42 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204918272 size=512 error=5
Aug 31 06:37:52 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:37:52 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:37:52 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204918272 size=512 error=5
Aug 31 06:38:31 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:38:31 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:38:31 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204918272 size=512 error=5
Aug 31 06:38:45 yoshi kernel: ad6: FAILURE - READ_DMA48
status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=932040832
Aug 31 06:38:45 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204905984 size=65536 error=5
Aug 31 06:38:45 yoshi root: ZFS: vdev I/O failure, zpool=data
path=/dev/ad6 offset=477204947968 size=512 error=5

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