[Ocfs2-users] Partition table crash, where can I find debug message?

[Frank Zhang]

Hi Experts, recently I observed a partition table crash that made me really scared.
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.
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

"SCSI device sdc: drive cache: write back
sdc: unknown partition table
sd 2:0:0:1: Attached scsi disk sdc
sd 2:0:0:1: Attached scsi generic sg3 type 0
OCFS2 Node Manager 1.4.4
OCFS2 DLM 1.4.4
OCFS2 DLMFS 1.4.4
OCFS2 User DLM kernel interface loaded
connection1:0: detected conn error (1011)"

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).
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.

And is there any way to recover the partition table? Thanks



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