[lustre-discuss] Stray files after failed lfs_migrate

Mohr, Rick mohrrf at ornl.gov
Wed Mar 3 14:10:22 PST 2021


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?


On 3/2/21, 5:24 AM, "lustre-discuss on behalf of Angelos Ching via lustre-discuss" <lustre-discuss-bounces at lists.lustre.org on behalf of lustre-discuss at lists.lustre.org> 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?


    Angelos Ching
    ClusterTech Limited

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