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[Xen-users] xm save and OCFS2?

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Subject: [Xen-users] xm save and OCFS2?
From: "Nick Couchman" <Nick.Couchman@xxxxxxxxx>
Date: Sat, 25 Apr 2009 16:49:48 -0600
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I was wondering if anyone knows why an "xm save" of a domain doesn't work to an OCFS2 volume?  My current Xen setup shares storage space between my hosts via OCFS2 on SAN-attached storage.  If I try to do an xm save of a running VM and put the save file on the OCFS2 volume, I get the following:

Error: /usr/lib64/xen/bin/xc_save 25 12 0 0 4 failed

Usage: xm save [-c] <Domain> <CheckpointFile>

Save a domain state to restore later.

  -c, --checkpoint               Leave domain running after creating        


xm log shows these events:

[2009-04-25 16:46:35 6410] DEBUG (XendCheckpoint:91) [xc_save]: /usr/lib64/xen/bin/xc_save 25 12 0 0 4

[2009-04-25 16:46:35 6410] DEBUG (XendCheckpoint:344) suspend

[2009-04-25 16:46:35 6410] DEBUG (XendCheckpoint:94) In saveInputHandler suspend

[2009-04-25 16:46:35 6410] DEBUG (XendCheckpoint:96) Suspending 12 ...

[2009-04-25 16:46:35 6410] DEBUG (XendDomainInfo:467) XendDomainInfo.shutdown(suspend)

[2009-04-25 16:46:35 6410] DEBUG (XendDomainInfo:1114) XendDomainInfo.handleShutdownWatch

[2009-04-25 16:46:35 6410] INFO (XendDomainInfo:1295) Domain has shutdown: name=migrating-DEllis id=12 reason=suspend.

[2009-04-25 16:46:35 6410] INFO (XendCheckpoint:102) Domain 12 suspended.

[2009-04-25 16:46:35 6410] DEBUG (XendCheckpoint:110) Written done

[2009-04-25 16:46:35 6410] INFO (XendCheckpoint:373) Saving memory pages: iter 1   0%ERROR Internal error: Error when writing to state file (5) (errno 14)

[2009-04-25 16:46:35 6410] INFO (XendCheckpoint:373) Save exit rc=1

[2009-04-25 16:46:35 6410] ERROR (XendCheckpoint:144) Save failed on domain DEllis (12).

Traceback (most recent call last):

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line 112, in save

    forkHelper(cmd, fd, saveInputHandler, False)

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", line 361, in forkHelper

    raise XendError("%s failed" % string.join(cmd))

XendError: /usr/lib64/xen/bin/xc_save 25 12 0 0 4 failed

And then the domain suspends, and then it crashes.  Any hints?

Thanks - Nick

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