[lustre-discuss] recovery MDT ".." directory entries (LU-5626)

Patrick Farrell paf at cray.com
Tue Oct 27 10:46:19 PDT 2015


That's something of a time bomb - If one of those directories fsck 
wishes it could correct is small and grows in number of files, you'll 
get the MDT going read only (and a few odd LBUGs if you try to put it back).

- Patrick

On 10/27/2015 12:18 PM, Mohr Jr, Richard Frank (Rick Mohr) wrote:
>> On Oct 27, 2015, at 11:22 AM, Chris Hunter <chris.hunter at yale.edu> wrote:
>> We have a lustre 1.8 filesystem that was upgraded to lustre 2.x and "dirdata" feature was enabled. We encountered LU-5626/LU-2638 issue with ".." directory entries. Are there established recovery steps for this issue ?
>> If I run fsck, the directory entries will be moved into lost+found.
>> I assume the next step is to run the ll_recover_lost_found_objs tool ?
>> Can you share any advice/experience about recovery ?
> I only recall seeing the bug once on my file system (about a year after we upgraded), so it really hasn’t been a problem.  It has been a while, so I don’t remember the details.  But I think I just handled it by not letting fsck make any “corrections”.
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
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