Created attachment 731119 [details]
## Logs vdsm, rhevm, libvirt

Description of problem:
Get ERROR: Stats function failed: <AdvancedStatsFunction _sampleDiskLatency at 0x25302f0>, via power off mass VMs

Version-Release number of selected component (if applicable):
RHEVM 3.2 - SF11 environment:

RHEVM: rhevm-3.2.0-10.14.beta1.el6ev.noarch	
VDSM: vdsm-4.10.2-11.0.el6ev.x86_64
LIBVIRT: libvirt-0.10.2-18.el6.x86_64
QEMU & KVM: qemu-kvm-rhev-0.12.1.2-2.355.el6_4.2.x86_64
SANLOCK: sanlock-2.6-2.el6.x86_64

Run scenarios:
1. Run power-off 200 VM's action, paralleled via PythonSDK

How reproducible:
100%

Steps to Reproduce:
1. Run power-off 200 VM's action, paralleled via PythonSDK
  
Actual results:
Get error libvirtError: Unable to write to monitor: Broken pipe

Expected results:
No exception should be found

Additional info:
/var/log/ovirt-engine/engine.log

/var/log/vdsm/vdsm.log

Thread-131049::ERROR::2013-04-03 11:25:38,360::utils::416::vm.Vm::(collect) vmId=`dc60bc7d-36ff-4602-9d54-211be4da8569`::Stats function failed: <AdvancedStatsFunction _sampleDiskLatency at 0x25302f0>
Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/vdsm/utils.py", line 412, in collect
    statsFunction()
  File "/usr/lib64/python2.6/site-packages/vdsm/utils.py", line 287, in __call__
    retValue = self._function(*args, **kwargs)
  File "/usr/share/vdsm/libvirtvm.py", line 187, in _sampleDiskLatency
    vmDrive.name, flags=libvirt.VIR_TYPED_PARAM_STRING_OKAY)
  File "/usr/share/vdsm/libvirtvm.py", line 529, in f
    ret = attr(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line 104, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1826, in blockStatsFlags
    if ret is None: raise libvirtError ('virDomainBlockStatsFlags() failed', dom=self)
libvirtError: Unable to write to monitor: Broken pipe