[Ocfs2-users] OCFS2 and Xen interoperability issue

[Sunil Mushran]

ocfs2 and kernel versions?

Gonçalo Borges wrote:
> Hi All...
>
> I'm testing a Xen solution on an OCFS2 SAN to store VM images,
> and I'm observing an interoperability issue between two kinds of
> softwares.
>
> I've already tried to obtain some feedback from Xen experts without
> any success. Maybe I'm more lucky on this list, and someone knows
> a workaround to the problem.
>
> The problem is the following: If I try to save a Virtual Machine (VM)
> asking to store the checkpoint file in any local dir of the physical
> host where the VM is running (ex: /tmp), everything works fine, and
> I can properly restore the VM afterwards. Nevertheless, if I try to save
> a VM asking to store the saved file inside the OCFS2 SAN, it fails with
> the following messages in (xend) log:
>
> ---*---
>
> [2009-08-21 14:45:25 xend 9720] INFO (XendCheckpoint:351) Saving memory
> pages: iter 1   0%ERROR Internal error: Error when writing to state file
> (5) (errno 14)
> [2009-08-21 14:45:25 xend 9720] INFO (XendCheckpoint:351) Save exit rc=1
> [2009-08-21 14:45:25 xend 9720] ERROR (XendCheckpoint:133) Save failed
> on domain one-0 (9).
> Traceback (most recent call last):
>     File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
> line 110, in save
>       forkHelper(cmd, fd, saveInputHandler, False)
>     File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
> line 339, in forkHelper
>       raise XendError("%s failed" % string.join(cmd))
> XendError: /usr/lib64/xen/bin/xc_save 26 9 0 0 0 failed
>
> ---*---
>
> It seems this is related to the fact that Xen is unable to "lock" the 
> remote
> block device, which in our case is an ocfs2 one. I'm not the only one 
> complaining
> about this issue, according to the following threads:
>
> http://lists.xensource.com/archives/html/xen-users/2009-04/msg00670.html
> http://lists.xensource.com/archives/html/xen-users/2008-09/msg00948.html
>
> I wonder if anyone can provide additional info, or if there is some 
> workaround
> for the problem?
>
> Cheers
> Goncalo
>
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