[ovirt-users] Host failed to attach one of the Storage Domains attached to it

[Alin Ilie]

Hello,

We have a small oVirt deplopyment, with 2 INTEL CPUs and 1 AMD, therefor 
we defined 2 clusters.
One of the Intel machines is running the management as well (We called 
this SOL).
This deployment is connected to a NAS through NFS shares.

Suddenly (no more than 2 days) SOL is reported as "Non operational" and 
in the Action Items is saying "
Host failed to attach one of the Storage Domains attached to it."
All other machines seems to be fine.

In the past we encountered similar errors after (accidental) reboot of 
the hosts, but now it is not the case:
[root at sol ~]# uptime
  08:10:48 up 9 days, 15:48,  1 user,  load average: 0.08, 0.05, 0.12

The "funny" is that the virtual machines already started on SOL are 
still running without any problems.

I am not sure what logs to check.

In /var/log/vdsm/vdsm.log we have this error, but I do not think it is 
relevant:
Thread-38964::ERROR::2015-07-05 
08:37:24,882::__init__::506::jsonrpc.JsonRpcServer::(_serveRequest) 
Internal server error
Traceback (most recent call last):
   File "/usr/lib/python2.6/site-packages/yajsonrpc/__init__.py", line 
501, in _serveRequest
     res = method(**params)
   File "/usr/share/vdsm/rpc/Bridge.py", line 271, in _dynamicMethod
     result = fn(*methodArgs)
   File "/usr/share/vdsm/API.py", line 1330, in getStats
     stats.update(self._cif.mom.getKsmStats())
   File "/usr/share/vdsm/momIF.py", line 60, in getKsmStats
     stats = self._mom.getStatistics()['host']
   File "/usr/lib/python2.6/site-packages/mom/MOMFuncs.py", line 75, in 
getStatistics
     host_stats = self.threads['host_monitor'].interrogate().statistics[-1]
AttributeError: 'NoneType' object has no attribute 'statistics'

Thank you !
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