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Not sure what you mean by a partition table crash. Is it that
someone<br>
overwrote the partition table on the iscsi server? That's what it
looks<br>
like. If mount cannot detect the fs type, then it means atleast
superblock<br>
corruption. And such corruptions typically caused by external
entities.<br>
Stray dd perhaps.<br>
<br>
Did you try recovering the superblock using one of the the backups?<br>
fsck.ocfs2 -r [1-6] /dev/sdX ?<br>
<br>
On 10/11/2011 07:04 PM, Frank Zhang wrote:
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<p class="MsoNormal">Hi Experts, recently I observed a partition
table crash that made me really scared.<o:p></o:p></p>
<p class="MsoNormal">I have two OVM servers sharing OCFS2 over
iscsi, after running a bunch of VMs for a while, all VMs
were gone and I saw the mount points of OCFS2 gone on both
hosts.<o:p></o:p></p>
<p class="MsoNormal">Then I tried to mount it again, the iscsi
device crashed by saying “please specify filesystem type”. I
checked dmesg but there is nothing useful except <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">“SCSI device sdc: drive cache: write back<o:p></o:p></p>
<p class="MsoNormal"> sdc: unknown partition table<o:p></o:p></p>
<p class="MsoNormal">sd 2:0:0:1: Attached scsi disk sdc<o:p></o:p></p>
<p class="MsoNormal">sd 2:0:0:1: Attached scsi generic sg3 type
0<o:p></o:p></p>
<p class="MsoNormal">OCFS2 Node Manager 1.4.4<o:p></o:p></p>
<p class="MsoNormal">OCFS2 DLM 1.4.4<o:p></o:p></p>
<p class="MsoNormal">OCFS2 DLMFS 1.4.4<o:p></o:p></p>
<p class="MsoNormal">OCFS2 User DLM kernel interface loaded<o:p></o:p></p>
<p class="MsoNormal"> connection1:0: detected conn error (1011)”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">basically after logging into ISCSI device
on both hosts, I created soft links of /dev/ovm_iscsi1
pointing to device node under
/dev/disk/by-path/real_isci_device, then I formatted
/dev/ovm_iscsi1 to OCFS2 and mounted them to somewhere(of
course I configured /etc/ocfs2/cluster.conf and made o2cb
correctly start).<o:p></o:p></p>
<p class="MsoNormal">Could somebody tell me where to get more
debug info to trace the problem? This is really scared
considering I may lose all my VMs because of the silent crash.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And is there any way to recover the
partition table? Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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