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Hard to say. You'll need to investigate the extent of the crash.<br>
<br>
On 10/12/2011 10:49 AM, Frank Zhang wrote:
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Sorry,
it’s not power outage, it’s just a normal reboot.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Is
this serious to corrupt the super block?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif"; color:
windowtext;">From:</span></b><span style="font-size:
10pt; font-family:
"Tahoma","sans-serif"; color:
windowtext;"> Frank Zhang <br>
<b>Sent:</b> Wednesday, October 12, 2011 10:37 AM<br>
<b>To:</b> 'Sunil Mushran'<br>
<b>Cc:</b> '<a class="moz-txt-link-abbreviated" href="mailto:ocfs2-users@oss.oracle.com">ocfs2-users@oss.oracle.com</a>'<br>
<b>Subject:</b> RE: [Ocfs2-users] Partition table crash,
where can I find debug message?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Thanks
Suni. Yes the terminology should be super block corruption.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">I
checked with my colleague they said the ISCSI server
suffered a power outage yesterday so they rebooted it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Given
it was under heavy usage because of many VM running on, I
guess this may be the cause. now I am trying to recover it<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif"; color:
windowtext;">From:</span></b><span style="font-size:
10pt; font-family:
"Tahoma","sans-serif"; color:
windowtext;"> Sunil Mushran <a moz-do-not-send="true"
href="mailto:[mailto:sunil.mushran@oracle.com]">[mailto:sunil.mushran@oracle.com]</a>
<br>
<b>Sent:</b> Wednesday, October 12, 2011 10:08 AM<br>
<b>To:</b> Frank Zhang<br>
<b>Cc:</b> '<a class="moz-txt-link-abbreviated" href="mailto:ocfs2-users@oss.oracle.com">ocfs2-users@oss.oracle.com</a>'<br>
<b>Subject:</b> Re: [Ocfs2-users] Partition table crash,
where can I find debug message?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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: <o:p></o:p></p>
<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>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Ocfs2-users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:Ocfs2-users@oss.oracle.com">Ocfs2-users@oss.oracle.com</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://oss.oracle.com/mailman/listinfo/ocfs2-users">http://oss.oracle.com/mailman/listinfo/ocfs2-users</a><o:p></o:p></pre>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif";"><o:p> </o:p></span></p>
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