[Lustre-discuss] missing ost's?

[Michael Di Domenico]

On Tue, Jun 16, 2009 at 8:25 PM, Michael Di
Domenico<mdidomenico4 at gmail.com> wrote:
> I have a small lustre test cluster with eight OST's running.  The
> servers were shut off over the weekend, upon turning them back on and
> trying to startup lustre I seem to have lost my OST's.
>
> [root at node1 ~]$ lctl dl
>  0 UP mgs MGS MGS 19
>  1 UP mgc MGC192.168.1.254 at tcp 8acd9bf1-d1ca-8e26-1fad-bd2cf88a2957 5
>  2 UP mdt MDS MDS_uuid 3
>  3 UP lov lustre-mdtlov lustre-mdtlov_UUID 4
>  4 UP mds lustre-MDT0000 lustre-MDT0000_UUID 3
>  5 UP ost OSS OSS_uuid 3
>  6 UP obdfilter lustre-OST0000 lustre-OST0000_UUID 3
>
> Everything in the messages log appears to be fine as if it was just a
> normal startup of lustre, except for the below message.  I'm not sure
> what logfile the error is referring to, and the message gives little
> detail on where i should start looking for an error.
>
> Jun 16 20:13:55 node1-eth0 kernel: LustreError:
> 3106:0:(llog_lvfs.c:577:llog_filp_open()) logfile creation
> CONFIGS/lustre-MDT0000T: -28
> Jun 16 20:13:55 node1-eth0 kernel: LustreError:
> 3106:0:(mgc_request.c:1086:mgc_copy_llog()) Failed to copy remote log
> lustre-MDT0000 (-28)

Apparently from the lustre manual the -28 at the end of the line is an
error code, which points to

-28 -ENOSPC The file system is out-of-space or out of inodes. Use lfs df
(query the amount of file system space) or lfs df -i
(query the number of inodes).

verified by

[root at node1 ~]$ df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/md2             1280000   42132 1237868    4% /
/dev/md0              255232      45  255187    1% /boot
tmpfs                 124645       1  124644    1% /dev/shm
/dev/md3               63872      24   63848    1% /mgs
/dev/md4              255040  255040       0  100% /mdt
/dev/md5             29892608   28726 29863882    1% /ost

I only put 500k files in the filesystem i would not have thought the
mdt would have used up the inodes that fast