<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
extent of the corruption... (not crash)<br>
<br>
On 10/12/2011 10:51 AM, Sunil Mushran wrote:
<blockquote cite="mid:4E95D3B0.5000907@oracle.com" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
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:
<blockquote
cite="mid:93099572B72EB341B81A644E134F240BF7A9F18F02@SJCPMAILBOX01.citrite.net"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
@font-face
{font-family:"\@SimSun";
panose-1:2 1 6 0 3 1 1 1 1 1;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
color:black;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";
color:black;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";
color:black;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;
color:black;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle20
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";
color:black;}
span.EmailStyle23
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<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>
<div>
<div style="border-width: 1pt medium medium; border-style:
solid none none; border-color: rgb(181, 196, 223)
-moz-use-text-color -moz-use-text-color; padding: 3pt 0in
0in;">
<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 moz-do-not-send="true"
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>
</div>
</div>
<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>
<div>
<div style="border-width: 1pt medium medium; border-style:
solid none none; border-color: rgb(181, 196, 223)
-moz-use-text-color -moz-use-text-color; padding: 3pt 0in
0in;">
<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 moz-do-not-send="true"
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>
</div>
</div>
<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>
</div>
</blockquote>
<br>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
Ocfs2-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Ocfs2-users@oss.oracle.com">Ocfs2-users@oss.oracle.com</a>
<a class="moz-txt-link-freetext" href="http://oss.oracle.com/mailman/listinfo/ocfs2-users">http://oss.oracle.com/mailman/listinfo/ocfs2-users</a></pre>
</blockquote>
<br>
</body>
</html>