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[Xen-users] XCP xapi debugging

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] XCP xapi debugging
From: George Shuklin <george.shuklin@xxxxxxxxx>
Date: Fri, 15 Oct 2010 16:01:44 +0400
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Good day.

Suddenly on pretty high loaded pool with about 50 VM per 5 hosts I got
following problem vm does not start and start command silently waiting.

xe task-list displays pack of tasks with same status and resident-on:

uuid ( RO)                  : b607ef7b-e185-72d9-4d3a-5795557922fc
            name-label ( RO): VM.start
      name-description ( RO): 
            subtask_of ( RO): <not in database>
              subtasks ( RO): 
           resident-on ( RO): e9dc1da9-178b-4a98-8dd2-571a920cd4cc
                status ( RO): pending
              progress ( RO): 0.000
                  type ( RO): <none/>
                result ( RO): 
               created ( RO): 20101015T11:03:04Z
              finished ( RO): 19700101T00:00:00Z
            error_info ( RO): 
    allowed_operations ( RO): Cancel

My next question: how can I know what happens? Where to look next?
dmesg, daemon.log, messages does not contain any valuable information.

I filter xensource.log but it only contain connection about task

How can I found what prevent VM starts?

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