Thanks Rick,
I've always assumed those data resides inside MDT, but your explanation
makes sense since the files are temporarily files used by mysqld which
might have been deleted while the files were being migrated. Since they
are not needed anyway, I just unlink-ed them (as rm will stat the file
before removal and it outright fails).
IIRC lfsck needs to be done with the whole volume offline?
Best regards,
Angelos
On 04/03/2021 06:10, Mohr, Rick via lustre-discuss wrote:
Angelos,
If a file still existed on the MDS but its data on the OST had somehow been
removed, then you might see symptoms like those you described. (stat fails
because info can't be retrieved from the ost, but lfs getstripe can still query
layout info from the mds.). But if that is the case, I can't really say how it
might have happened in the first place.
Have you tried running lfsck to look for consistency problems?
--Rick
On 3/2/21, 5:24 AM, "lustre-discuss on behalf of Angelos Ching via lustre-discuss"
<[email protected] on behalf of [email protected]>
wrote:
Dear all,
I was dealing with some OST migration using lfs_migrate and things went
mostly fine albeit for a few files that might have been in use during
the migration:
> # ls
> ls: cannot access ibleTHWm: No such file or directory
> ls: cannot access ib7rP0qy: No such file or directory
> ls: cannot access ib3AQ9vK: No such file or directory
> ls: cannot access ib30N1p9: No such file or directory
> ib30N1p9 ib3AQ9vK ib7rP0qy ibleTHWm
> # stat ib30N1p9
> stat: cannot stat ‘ib30N1p9’: No such file or directory
> # lfs getstripe ib30N1p9
> ib30N1p9
> lmm_stripe_count: 1
> lmm_stripe_size: 1048576
> lmm_pattern: raid0
> lmm_layout_gen: 0
> lmm_stripe_offset: 1
> obdidx objid objid group
> 1 71909438 0x449403e 0
The files couldn't be stat'ed but still returns upon lfs getstripe.
The same error appears on all clients and I've tried unmounting and
remounting the MDT on the server side already.
Any idea what might have been corrupted and what could be the fix?
Cheers,
--
Angelos Ching
ClusterTech Limited
Tel : +852-2655-6138
Fax : +852-2994-2101
Address : Unit 211-213, Lakeside 1, 8 Science Park West Ave., Shatin,
Hong Kong
Got praises or room for improvements? http://bit.ly/TellAngelos
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