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I found the problem, <br>
somehow the OST client configuration file was corrupted.<br>
<br>
I found this post very useful:<br>
<a class="moz-txt-link-freetext" href="http://lustre-discuss.lustre.narkive.com/Z5s6LU8B/lustre-2-5-2-unable-to-mount-ost">http://lustre-discuss.lustre.narkive.com/Z5s6LU8B/lustre-2-5-2-unable-to-mount-ost</a><br>
<div class="moz-cite-prefix"><br>
<br>
I tried the same steps:<br>
<br>
unmount OST and MGT/MDT<br>
mount the OST and MGS with ldiskfs<br>
llog on the client configuration file crashed, so I copied the one
from the MGS<br>
unmount all the filesystems<br>
run a writeconf to the MDS and all OSTs<br>
reboot the system<br>
<br>
After the reboot the OST was mounted, and after a long check the
client could also mount the volume<br>
<br>
Thanks in any case<br>
<br>
ciao<br>
Stefano<br>
<br>
P.S. the steps in details were:<br>
# umount /mnt/lustre-ost<br>
# mount -t ldiskfs /dev/sda1 /mnt/lustre-ost<br>
<br>
# umount /mnt/lustre-mdt-mds/<br>
# mount -t ldiskfs /dev/mapper/seqdata /mnt/lustre-mdt-mds<br>
Verify that llog crashed with<br>
# llog_reader /mnt/lustre-ost/CONFIGS/seqdata-client <br>
<br>
Copy the non-corrupted file from MGS <br>
# cp /mnt/lustre-ost/CONFIGS/seqdata-client
/mnt/lustre-ost/CONFIGS/seqdata-client.ORIG<br>
# cp -f /mnt/lustre-mdt-mds/CONFIGS/seqdata-client
/mnt/lustre-ost/CONFIGS/seqdata-client<br>
# tunefs.lustre --verbose --writeconf /dev/mapper/seqdata<br>
# reboot<br>
<br>
<br>
On 04/26/2017 10:27 AM, Stefano Turolla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:004ec27d-4558-d6b4-d443-dafbea0da330@genzentrum.lmu.de">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
Actually, this is what I thought, but all files and directories
are there<br>
<br>
[root@newmaster ~]# ls -lrtd /dev/mapper/seqdata /mnt/lustre-ost
/dev/dm-0 <br>
drwxr-xr-x 2 root root 6 Dec 2 13:35 /mnt/lustre-ost<br>
brw-rw---- 1 root disk 253, 0 Apr 25 11:59 /dev/dm-0<br>
lrwxrwxrwx 1 root root 7 Apr 25 11:59 /dev/mapper/seqdata
-> ../dm-0<br>
<br>
Besides that, the file system seems to be there<br>
[root@newmaster ~]# e2fsck /dev/mapper/seqdata <br>
e2fsck 1.42.13.wc5 (15-Apr-2016)<br>
seqdata-OST0000: clean, 974805/31538944 files,
3578657570/8073955508 blocks<br>
<br>
Stefano<br>
<br>
<div class="moz-cite-prefix">On 04/25/2017 11:49 PM, Brett Lee
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAHZA4jQUgz_j2DWd-ehjWre2hHFUvcXWYP14rtvtCj-9g2foHA@mail.gmail.com">
<p>"No such file or directory."</p>
<p>Could that be the cause?</p>
<p>Brett<br>
--<br>
Protect Yourself Against Cybercrime<br>
PDS Software Solutions LLC<br>
<a href="https://www.TrustPDS.com" moz-do-not-send="true">https://www.TrustPDS.com</a></p>
<div class="gmail_quote">On Apr 25, 2017 4:25 AM, "Stefano
Turolla" <<a href="mailto:turolla@genzentrum.lmu.de"
moz-do-not-send="true">turolla@genzentrum.lmu.de</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> 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 <wbr>
/mnt/lustre-mdt-mds lustre
noauto,_netdev 0 0</address>
<address> /dev/mapper/seqdata <wbr>
/mnt/lustre-ost lustre
noauto,_netdev 0 0</address>
<address> # Lustre Client</address>
<address> master-mds@tcp:/seqdata <wbr>
/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-<wbr>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_<wbr>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,<wbr>nodelalloc</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(llog_osd.c:246:llog_<wbr>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_<wbr>osd_read_header())
Skipped 1 previous similar message</address>
<address>Apr 25 12:13:42 newmaster kernel: LustreError:
11242:0:(mgc_request.c:1832:<wbr>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:<wbr>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:<wbr>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:<wbr>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>
</div>
<br>
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</blockquote>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Stefano Turolla
Gene Center
University of Munich
Feodor-Lynen-Str. 25 81377 Munich, Germany
tel. +49 (0)89 2180 71055
email. <a class="moz-txt-link-abbreviated" href="mailto:turolla@genzentrum.lmu.de" moz-do-not-send="true">turolla@genzentrum.lmu.de</a>
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<br>
<pre class="moz-signature" cols="72">--
Stefano Turolla
Gene Center
University of Munich
Feodor-Lynen-Str. 25 81377 Munich, Germany
tel. +49 (0)89 2180 71055
email. <a class="moz-txt-link-abbreviated" href="mailto:turolla@genzentrum.lmu.de">turolla@genzentrum.lmu.de</a>
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