Xen users - Dec 2011 - pbd-plug failing when attaching an SR that was introduced

Any troubleshooting steps I can follow to get this SR attached again?  Has
anyone seen this error before?

 

xe pbd-plug uuid=b804d322-c501-6b59-fb7e-b6612042535c
There was an SR backend failure.
status: non-zero exit
stdout:
stderr: Traceback (most recent call last):
  File "/opt/xensource/sm/LVMSR", line 1446, in ?
    SRCommand.run(LVHDSR, DRIVER_INFO)
  File "/opt/xensource/sm/SRCommand.py", line 246, in run
    ret = cmd.run(sr)
  File "/opt/xensource/sm/SRCommand.py", line 94, in run
    return self._run_locked(sr)
  File "/opt/xensource/sm/SRCommand.py", line 131, in _run_locked
    return self._run(sr, target)
  File "/opt/xensource/sm/SRCommand.py", line 223, in _run
    return sr.attach(self.params[''sr_uuid''])
  File "/opt/xensource/sm/LVMSR", line 308, in attach
    self._checkMetadataVolume(self.sm_config)
  File "/opt/xensource/sm/LVMSR", line 200, in _checkMetadataVolume
    self._synchMetaData(map)
  File "/opt/xensource/sm/LVMSR", line 210, in _synchMetaData
    xml = metadata.retrieveXMLfromFile(self.mdpath)
  File "/opt/xensource/sm/metadata.py", line 103, in
retrieveXMLfromFile
    _testHdr(hdr)
  File "/opt/xensource/sm/metadata.py", line 41, in _testHdr
    assert(hdr[2] <= MD_MAJOR)
AssertionError

 



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On 19.12.2011 08:21, Jeremy Udit wrote:
>
> Any troubleshooting steps I can follow to get this SR attached again?  
> Has anyone seen this error before?
>
> xe pbd-plug uuid=b804d322-c501-6b59-fb7e-b6612042535c
> There was an SR backend failure.
> status: non-zero exit
> stdout:
> stderr: Traceback (most recent call last):
>   File "/opt/xensource/sm/LVMSR", line 1446, in ?
>     SRCommand.run(LVHDSR, DRIVER_INFO)
>
(skip)
>
>   File "/opt/xensource/sm/metadata.py", line 103, in
retrieveXMLfromFile
>     _testHdr(hdr)
>   File "/opt/xensource/sm/metadata.py", line 41, in _testHdr
>     assert(hdr[2] <= MD_MAJOR)
> AssertionError
>
Well, start from /var/log/SMlog to see which command is actually 
failing. All storage stuff is performed not by xapi, but by the sm 
(/opt/xensource/sm) which is written in python.

There can be bunch of errors and reasons, and probably you will need to 
dig to the underlaying LVM stuff.

P.S. Are you having updated system? If you install ''normal''
LVM2 package
from centos repository this will broke many LVM operations.


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