Could be that the device has been claimed by some other entity. Like lvm,
multipath, etc.
On Apr 13, 2011, at 4:08 AM, Asle Næss <asle.na...@telio.no> wrote:
> Hi,
>
> I have the following setup:
>
> 2 linux nodes connected to shared SAN, both nodes have shared OCFS2 volume as
> /dev/sdb1
> Both servers are running CentOS 5.5
>
> Node 1 has volume mounted RW.
> Node 2 has volume mounted RO.
>
> After an unscheduled reboot of node 2 it is no longer able to mount
> filesystem:
>
> # /etc/init.d/ocfs2 start
> Starting Oracle Cluster File System (OCFS2)
> mount.ocfs2: Device or resource busy while mounting /dev/sdb1 on /data/.
> Check 'dmesg' for more information on this error.
> [FAILED]
>
> dmesg has no information of why it failed.
>
> I've used strace on mount command and believe this is the relevant problem:
>
> mount("/dev/sdb1", "/tmp/sadgfdgerwterfdsvcew/", "ocfs2", 0,
> "heartbeat=local") = -1 EBUSY (Device or resource busy)
>
> Note that I've tried mounting it on "/tmp/sadgfdgerwterfdsvcew/" which is a
> random directory created just before mounting to rule out the possibility of
> a busy mount point.
>
> Controlled reboot of node 2 did not resolve problem.
>
> I believe this show that only node 1 has filesystem mounted:
> # echo "slotmap" | debugfs.ocfs2 -n /dev/sdb1
> Slot# Node#
> 0 1
>
> All commands shown here is done on node 2.
> I'm also able to read disk with other tools on server.
>
> Please advise on how to proceed with debugging and resolving this issue.
>
> Regards,
> Asle Ness
>
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