[Xen-users] Snapshot fail, when I snapshot a vm the second time.

[huang.shuangqing@xxxxxxxxxx]

Hello,

When I snapshot a vm the first time,
it succeed. There is a snapshot file on disk and the vm is  running.
 But when I do it the second time, it fail.
Can  snapshot a vm sevral  times?
 If can , what's wrong with it? 

xen : xen-4.0.1-rc5, kernel : kernel-2.6.31.

Error message:
[root@localhost ide]# xm save -c 8 dom8_2.snap
Error: Timeout waiting for domain 8
to suspend
Usage: xm save [-c] <Domain> <CheckpointFile>

Save a domain state to restore later.
  -c, --checkpoint    
          Leave domain running after creating
       
           
                     snapshot


log in xend.log :

[2010-11-08 09:19:03 18934] DEBUG (XendCheckpoint:124)
[xc_save]: /usr/lib64/xen/bin/xc_save 4 8 0 0 4
[2010-11-08 09:19:03 18934] DEBUG (XendCheckpoint:394)
suspend
[2010-11-08 09:19:03 18934] DEBUG (XendCheckpoint:127)
In saveInputHandler suspend
[2010-11-08 09:19:03 18934] DEBUG (XendCheckpoint:129)
Suspending 8 ...
[2010-11-08 09:19:03 18934] DEBUG (XendDomainInfo:519)
XendDomainInfo.shutdown(suspend)
[2010-11-08 09:19:03 18934] DEBUG (XendDomainInfo:1891)
XendDomainInfo.handleShutdownWatch
[2010-11-08 09:19:03 18934] INFO (XendCheckpoint:423)
xc_save: failed to get the suspend evtchn port
[2010-11-08 09:19:03 18934] INFO (XendCheckpoint:423)
[2010-11-08 09:20:04 18934] INFO (XendCheckpoint:423)
ERROR Internal error: Suspend request failed
[2010-11-08 09:20:04 18934] INFO (XendCheckpoint:423)
ERROR Internal error: Domain appears not to have suspended
[2010-11-08 09:20:04 18934] INFO (XendCheckpoint:423)
Save exit rc=1
[2010-11-08 09:20:04 18934] ERROR (XendCheckpoint:178)
Save failed on domain CGSL (8) - resuming.
Traceback (most recent call last):
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 146, in save
    forkHelper(cmd, fd, saveInputHandler,
False)
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 395, in forkHelper
    inputHandler(line, child.tochild)
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 131, in saveInputHandler
    dominfo.waitForSuspend()
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 2980, in waitForSuspend
    raise XendError(msg)
XendError: Timeout waiting for domain
8 to suspend
[2010-11-08 09:20:04 18934] DEBUG (XendDomainInfo:3117)
XendDomainInfo.resumeDomain(8)
[2010-11-08 09:20:04 18934] DEBUG (XendDomainInfo:1891)
XendDomainInfo.handleShutdownWatch

Any help is appreciate.

-- John


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