Re: XFS File system in trouble

Leslie Rhorer
2015-07-20T08:35:17Z

On 7/20/2015 3:05 AM, Martin Papik wrote:
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> Since you've already found one HW related fault, would you consider
> booting into memtest for a couple of passes just to be on the safe
> side.

I did that after confirming the one stick of memory was bad. Twice. I
got over 20,000 errors on the bad stick, and 0 on the good one. I also
swapped the locations on the motherboard, and the bad stick still failed
while the good one passed 100%.

> And did you by any chance look at SMART if applicable and
> possibly running a test on the drives.

Yes. SMART found no errors, but think about it. Every time tar tries
to create a directory when untarring that file in that location, the
file system croaks when it tries to create a directory. Not when reading
and not when writing other than when it creates a directory. When I
create the directory manualy, the process quits failing at that point
and fails later on during a different directory create. The array
remains intact when reading, and dmesg shows no drive errors. I've
re-synced the array, which reads every byte on all 8 drives without a
single mismatch - several times. To my knowledge, no read has ever
failed except after the filesystem goes offline. I thought reads were
failing during the CRC checks, but that was a red herring.

> Another test I sometimes do
> when I'm unsure about disks is "cat /dev/sda > /dev/null" (i.e. a
> whole disk read test)

echo repair > /sys/block/md0/md/sync_action reads not one drive, but
every byte on all 8 drives.

> and see (dmesg) if any errors show up, unless

'Nary one, and no mismatches.

> you're willing to run badblocks in a read-write nondestructive mode.
> In my experience the read test or badblocks can be run simultaneously
> with smartctl -t long. But as a start I'd look at smartctl --all
> /dev/sd? and see if there are any bad signs. I hope this helps. Good luck
>
>
> On 07/20/2015 10:41 AM, Leslie Rhorer wrote:
>> On 7/19/2015 6:27 PM, Dave Chinner wrote:
>>> On Sat, Jul 18, 2015 at 08:02:50PM -0500, Leslie Rhorer wrote:
>>>>
>>>> I found the problem with md5sum (and probably nfs, as well).
>>>> One of the memory modules in the server was bad. The problem
>>>> with XFS persists. Every time tar tried to create the
>>>> directory:
>>>
>>> Now you need to run xfs_repair.
>>
>> I do that every time the array implodes. It makes no difference.
>> It never mentions cleaning the structure tar says needs cleaning,
>> and the next time I run tar on that file, the filesystem craters.
>>
>> _______________________________________________ xfs mailing list
>> xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs
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