[Users] SPM not selected after host failed

[Patrick Hurrelmann]

On 20.09.2012 16:13, Itamar Heim wrote:
> On 09/20/2012 05:09 PM, Patrick Hurrelmann wrote:
>> On 20.09.2012 16:01, Itamar Heim wrote:
>>>> Power management is configured for both nodes. But this might be the
>>>> problem: we use the integrated IPMI over LAN power management - and
>>>> if I pull the plug on the machine the power management becomes un-
>>>> available, too.
>>>>
>>>> Could this be the problem?
>>>
>>> yes... no auto recovery if can't verify node was fenced.
>>> for your tests, maybe power off the machine for your tests as opposed to
>>> "no power"?
>>
>> Ugh, this is ugly. I'm evaluating oVirt currently myself and have
>> already suffered from a dead PSU that took down IPMI as well. I really
>> don't want to imagine what happens if the host with SPM goes down due to
>> a power failure :/ Is there really no other way? I guess multiple fence
>> devices are not possible right now. E.g. first try to fence via IPMI and
>> if that fails pull the plug via APC MasterSwitch. Any thoughts?
> 
> SPM would be down until you manually confirm shutdown in this case.
> SPM doesn't affect running VMs on NFS/posix/local domains, and only 
> thinly provisioned VMs on block storage (iscsi/FC).
> 
> question, if no power, would the APC still work?
> why not just use it to fence instead of IPMI?
> 
> (and helping us close the gap on support for multiple fence devices 
> would be great)
> 

Ok, maybe I wasn't precise enough. With power failure I actually meant a
broken PSU on the server and I won't be running any local/NFS storage
but only iSCSI.
But you're right with your point that in such situation fencing via APC
would be sufficient. I was mixing my different environments. My lab only
has IPMI right now, while the live environment most likely will have APC
as well.

Regards
Patrick

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