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

[Ayal Baron]

----- Original Message -----
> ----- Original Message -----
> > From: "Sander Grendelman" <sander at grendelman.com>
> > To: "Itamar Heim" <iheim at redhat.com>
> > Cc: users at ovirt.org, "Michal Skrivanek" <mskrivan at redhat.com>
> > Sent: Wednesday, December 18, 2013 11:40:36 AM
> > Subject: Re: [Users] Excessive syslog logging from vdsm/sampling.py
> > 
> > - vdsm-4.13.0-11.el6.x86_64
> > - FC storage domain
> > - no floppies attached to VMs as far as I know (any way to test this?)
> > 
> > On Wed, Dec 18, 2013 at 10:21 AM, Itamar Heim <iheim at redhat.com> wrote:
> > > On 12/17/2013 09:04 AM, Sander Grendelman wrote:
> > >>
> > >> Any ideas on this one?
> > >>
> > >> On Mon, Dec 16, 2013 at 11:31 AM, Sander Grendelman
> > >> <sander at grendelman.com> wrote:
> > >>>
> > >>> 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'
> 
> This is not spam, but a real error in the code:
> 
>     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):
>         File "/usr/share/vdsm/sampling.py", line 351, in
>         collectstatsFunction()
>         File "/usr/share/vdsm/sampling.py", line 226, in __call__
>             retValue = self._function(*args, **kwargs)
>         File "/usr/share/vdsm/vm.py", line 509, in _highWrite
>             if not vmDrive.blockDev or vmDrive.format != 'cow':
>         AttributeError: 'Drive' object has no attribute 'format'
> 
> We should check why vmDrive does not have the format attribute in your case.

Probably because this was checked during migration it's a race between migration finish and monitoring checking this.
You can see the error repeated in other cases as well (in bugzilla): 988047, 994534

> The best way to resolve this would be to
> open a bug and attach vdsm logs, which may explain why this is happening.
> 
> Thanks for reporting it!
> 
> Thanks,
> Nir
> 
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