[Users] Excessive syslog logging from vdsm/sampling.py

[Sander Grendelman]

The syslog on my ovirt nodes is constantly logging errors from sampling.py:

Dec 16 11:22:47 gnkvm01 vdsm vm.Vm ERROR
vmId=`66aa5555-2299-4d93-931d-b7a2e421b7e9`::Stats function failed:
<AdvancedStatsFunction _highWrite at 0x1733dc0>#012Traceback (most
recent call last):#012  File "/usr/share/vdsm/sampling.py", line 351,
in collect#012    statsFunction()#012  File
"/usr/share/vdsm/sampling.py", line 226, in __call__#012    retValue =
self._function(*args, **kwargs)#012  File "/usr/share/vdsm/vm.py",
line 509, in _highWrite#012    if not vmDrive.blockDev or
vmDrive.format != 'cow':#012AttributeError: 'Drive' object has no
attribute 'format'
Dec 16 11:22:47 gnkvm01 vdsm vm.Vm ERROR
vmId=`22654002-cbef-454d-b001-7823da5f592f`::Stats function failed:
<AdvancedStatsFunction _highWrite at 0x1733dc0>#012Traceback (most
recent call last):#012  File "/usr/share/vdsm/sampling.py", line 351,
in collect#012    statsFunction()#012  File
"/usr/share/vdsm/sampling.py", line 226, in __call__#012    retValue =
self._function(*args, **kwargs)#012  File "/usr/share/vdsm/vm.py",
line 509, in _highWrite#012    if not vmDrive.blockDev or
vmDrive.format != 'cow':#012AttributeError: 'Drive' object has no
attribute 'format'
Dec 16 11:22:48 gnkvm01 vdsm vm.Vm ERROR
vmId=`d3dae626-279b-4bcf-afc4-7a3c198a3035`::Stats function failed:
<AdvancedStatsFunction _highWrite at 0x1733dc0>#012Traceback (most
recent call last):#012  File "/usr/share/vdsm/sampling.py", line 351,
in collect#012    statsFunction()#012  File
"/usr/share/vdsm/sampling.py", line 226, in __call__#012    retValue =
self._function(*args, **kwargs)#012  File "/usr/share/vdsm/vm.py",
line 513, in _highWrite#012    self._vm._dom.blockInfo(vmDrive.path,
0)#012  File "/usr/share/vdsm/vm.py", line 835, in f#012    ret =
attr(*args, **kwargs)#012  File
"/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line
76, in wrapper#012    ret = f(*args, **kwargs)#012  File
"/usr/lib64/python2.6/site-packages/libvirt.py", line 1797, in
blockInfo#012    if ret is None: raise libvirtError
('virDomainGetBlockInfo() failed', dom=self)#012libvirtError: invalid
argument: invalid path
/rhev/data-center/mnt/blockSD/b526b148-b810-47c6-9bdd-4fd8d8226855/images/347f2238-c018-4370-94df-bd1e81f8b854/9e5dad95-73ea-4e5c-aa13-522efd9bad11
not assigned to domain
Dec 16 11:22:48 gnkvm01 vdsm vm.Vm ERROR
vmId=`c6f56584-1ccd-4c02-be94-897a4e747d34`::Stats function failed:
<AdvancedStatsFunction _highWrite at 0x1733dc0>#012Traceback (most
recent call last):#012  File "/usr/share/vdsm/sampling.py", line 351,
in collect#012    statsFunction()#012  File
"/usr/share/vdsm/sampling.py", line 226, in __call__#012    retValue =
self._function(*args, **kwargs)#012  File "/usr/share/vdsm/vm.py",
line 509, in _highWrite#012    if not vmDrive.blockDev or
vmDrive.format != 'cow':#012AttributeError: 'Drive' object has no
attribute 'format'
Dec 16 11:22:48 gnkvm01 vdsm vm.Vm ERROR
vmId=`0ae3a3d7-ead9-4c0d-9df0-3901b6e6859c`::Stats function failed:
<AdvancedStatsFunction _highWrite at 0x1733dc0>#012Traceback (most
recent call last):#012  File "/usr/share/vdsm/sampling.py", line 351,
in collect#012    statsFunction()#012  File
"/usr/share/vdsm/sampling.py", line 226, in __call__#012    retValue =
self._function(*args, **kwargs)#012  File "/usr/share/vdsm/vm.py",
line 509, in _highWrite#012    if not vmDrive.blockDev or
vmDrive.format != 'cow':#012AttributeError: 'Drive' object has no
attribute 'format'

These messages might have something to do with reading
information/statistics through the API.
But I've stopped all my (monitoring) processes using the API.

Restarting ovirt-engine and vdsm did not resolve the issue.

Both nodes and engine server are running oVirt 3.3.1 on CentOS 6.4

This may be a red herring but the values  of disk statistics read
through the API are "static"/unchanging.

Any clues on whether these messages are serious and any ideas on how
to stop them
spamming my system logs?