xfs_repair Input/output error

xfs_repair Input/output error

[Cory Coager]

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I had a power failure while I was running a defrag on an xfs partition. Now
I am unable to mount, xfs_check or xfs_repair the partition. The partition
is lvm and all other partitions seem to be fine except this one. When
attempting to mount the partition the drive makes some funny noises and
these messages spit out on the console:

hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=268552872,
high=16, low=117416, sector=268552868
ide: failed opcode was: unknown
end_request: I/O error, dev hda, sector 268552868

I believe the drive is fine because check_ide_smart reports:

Id=  1, Status=11 {PreFailure , OnLine }, Value=100, Threshold= 60, Passed
Id=  2, Status= 5 {PreFailure , OffLine}, Value=100, Threshold= 50, Passed
Id=  3, Status= 7 {PreFailure , OnLine }, Value=151, Threshold= 24, Passed
Id=  4, Status=18 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=  5, Status=51 {PreFailure , OnLine }, Value=100, Threshold=  5, Passed
Id=  7, Status=11 {PreFailure , OnLine }, Value=100, Threshold= 67, Passed
Id=  8, Status= 5 {PreFailure , OffLine}, Value=100, Threshold= 20, Passed
Id=  9, Status=18 {Advisory    , OnLine }, Value= 96, Threshold=  0, Passed
Id= 10, Status=19 {PreFailure , OnLine }, Value=100, Threshold= 60, Passed
Id= 12, Status=50 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=192, Status=50 {Advisory    , OnLine }, Value= 99, Threshold= 50, Passed
Id=193, Status=18 {Advisory    , OnLine }, Value= 99, Threshold= 50, Passed
Id=194, Status= 2 {Advisory    , OnLine }, Value=137, Threshold=  0, Passed
Id=196, Status=50 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=197, Status=34 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=198, Status= 8 {Advisory    , OffLine}, Value=100, Threshold=  0, Passed
Id=199, Status=10 {Advisory    , OnLine }, Value=200, Threshold=  0, Passed
OffLineStatus=0 {NeverStarted}, AutoOffLine=No, OffLineTimeout=92 minutes
OffLineCapability=27 {Immediate Auto SuspendOnCmd}
SmartRevision=16, CheckSum=151, SmartCapability=3 {SaveOnStandBy AutoSave}

I can xxd and dd this partition without getting any console errors. I can
also mount the partition with -o ro,norecovery.  How do I repair this and
recover my data?

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Re: xfs_repair Input/output error

[Michael Monnerie]

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On Mittwoch 29 April 2009 Cory Coager wrote:
> When attempting to mount the partition the drive makes some funny
> noises and these messages spit out on the console:
>
> hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
> hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=268552872,
> high=16, low=117416, sector=268552868
> ide: failed opcode was: unknown
> end_request: I/O error, dev hda, sector 268552868

This is definitely your drive gone bad.

> I believe the drive is fine because check_ide_smart reports:

If the drive "makes funny noises" and I/O errors are logged, it has bad 
sectors. Try with
# smartctl -a /dev/sda
and look for a line like this:
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always  -  0

If the last number is >0, your drive has problems - replace it!

For a full SMART check, please try:
smartctl --smart=on --offlineauto=on --saveauto=on --test=long /dev/sda

This tells your drive to make a long selftest. It prints the estimated 
time for the test to run (usually 1-3h). Then check your smart values 
again. You should try to not use your drive during this time.

> I can xxd and dd this partition without getting any console errors. 

It is possible the drive remapped the bad sectors itself.

> I can also mount the partition with -o ro,norecovery.  How do I repair
> this and recover my data?

Plug in new drive.
Boot from recovery cd
dd if=/dev/sda of=/dev/sdb 
remove old drive
xfs_repair
enjoy

mfg zmi
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