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Re: [Xen-users] pbd-plug failing when attaching an SR that was introduced



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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