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Dear all, I am a newbie in lustre, I set up a simple configuration
to mount a filesystem from a Dell Powervault MD3800i (iscsi +
multipath enabled)<br>
It was working properly but, after the last reboot I cannot mount
the lustre filesystem anymore<br>
I am running lustre 3.10.0 on scientific linux 7.3.<br>
I put MDT/MDS on the server<br>
together with OST <br>
<br>
Here is the relevant /etc/fstab<br>
<br>
<address># Lustre MDT / MDS (Manage filenames, directories etc and
Block devices</address>
<address>
/dev/sda1 /mnt/lustre-mdt-mds
lustre noauto,_netdev 0 0</address>
<address>
/dev/mapper/seqdata /mnt/lustre-ost
lustre noauto,_netdev 0 0</address>
<address>
# Lustre Client</address>
<address>
master-mds@tcp:/seqdata /seq_data
lustre noauto,_netdev 0 0</address>
<br>
I can mount the /mnt/lustre-mdt-mds filesystem but not the OST, and
of course no client<br>
<br>
<br>
here are the devices<br>
<address>[root@newmaster lustre]# cat /proc/fs/lustre/devices </address>
<address> 0 UP osd-ldiskfs seqdata-MDT0000-osd
seqdata-MDT0000-osd_UUID 9</address>
<address> 1 UP mgs MGS MGS 5</address>
<address> 2 UP mgc MGC10.163.85.99@tcp
69e92317-78f6-eef7-1764-57da5aadafe2 5</address>
<address> 3 UP mds MDS MDS_uuid 3</address>
<address> 4 UP lod seqdata-MDT0000-mdtlov
seqdata-MDT0000-mdtlov_UUID 4</address>
<address> 5 UP mdt seqdata-MDT0000 seqdata-MDT0000_UUID 5</address>
<address> 6 UP mdd seqdata-MDD0000 seqdata-MDD0000_UUID 4</address>
<address> 7 UP qmt seqdata-QMT0000 seqdata-QMT0000_UUID 4</address>
<address> 8 UP osp seqdata-OST0000-osc-MDT0000
seqdata-MDT0000-mdtlov_UUID 5</address>
<address> 9 UP lwp seqdata-MDT0000-lwp-MDT0000
seqdata-MDT0000-lwp-MDT0000_UUID 5</address>
<br>
<br>
Here are the errors when I try to mount the OST<br>
<br>
<address>[root@newmaster lustre]# mount /mnt/lustre-ost </address>
<address><br>
Apr 25 12:13:41 newmaster kernel: LDISKFS-fs (dm-0): file extents
enabled, maximum tree depth=5</address>
<address>Apr 25 12:13:42 newmaster kernel: LDISKFS-fs (dm-0):
mounted filesystem with ordered data mode. Opts:
,errors=remount-ro,no_mbcache,nodelalloc</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(llog_osd.c:246:llog_osd_read_header())
seqdata-OST0000-osd: error reading [0xa:0x14:0x0] log header size
8192: rc = -14</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(llog_osd.c:246:llog_osd_read_header()) Skipped 1 previous
similar message</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(mgc_request.c:1832:mgc_llog_local_copy())
MGC10.163.85.99@tcp: failed to copy remote log seqdata-client: rc
= -14</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError: 13a-8:
Failed to get MGS log seqdata-client and no local copy.</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError: 15c-8:
MGC10.163.85.99@tcp: The configuration from log 'seqdata-client'
failed (-2). This may be the result of communication errors
between this node and the MGS, a bad configuration, or other
errors. See the syslog for more information.</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(obd_mount_server.c:1369:server_start_targets())
seqdata-OST0000: failed to start LWP: -2</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(obd_mount_server.c:1844:server_fill_super()) Unable to
start targets: -2</address>
<address>Apr 25 12:13:42 newmaster kernel: Lustre: Failing over
seqdata-OST0000</address>
<address>Apr 25 12:13:42 newmaster kernel: Lustre: server umount
seqdata-OST0000 complete</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(obd_mount.c:1449:lustre_fill_super()) Unable to mount
(-2)</address>
<address>mount.lustre: mount /dev/mapper/seqdata at /mnt/lustre-ost
failed: No such file or directory</address>
<address>Is the MGS specification correct?</address>
<address>Is the filesystem name correct?</address>
<address>If upgrading, is the copied client log valid? (see upgrade
docs)</address>
<br>
<br>
Here is the lnet configuration, currently only the server is listed<br>
<address>[root@newmaster lustre]# cat /etc/modprobe.d/lustre.conf </address>
<address>options lnet networks=tcp0(eth2)</address>
<br>
I tried to search in the mailing list some good explanation of what
happened but I could not find any.<br>
Could you please help me to debug the problem?<br>
Thanks a lot in advance<br>
Stefano Turolla<br>
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