[Users] SPM not selected after host failed

[Jorick Astrego]

On 09/20/2012 04:36 PM, users-request at ovirt.org wrote:
> Date: Thu, 20 Sep 2012 17:13:25 +0300 From: Itamar Heim 
> <iheim at redhat.com> To: patrick.hurrelmann at lobster.de Cc: 
> users at ovirt.org Subject: Re: [Users] SPM not selected after host 
> failed Message-ID: <505B2485.9080604 at redhat.com> Content-Type: 
> text/plain; charset=ISO-8859-15; format=flowed 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)
>
>
> ------------------------------
>
> Message: 8
> Date: Thu, 20 Sep 2012 16:24:47 +0200
> From: Patrick Hurrelmann<patrick.hurrelmann at lobster.de>
> To:users at ovirt.org
> Subject: Re: [Users] SPM not selected after host failed
> Message-ID:<505B272F.7000301 at lobster.de>
> Content-Type: text/plain; charset=ISO-8859-15
>
> 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
We don't have an APC, but we have dual psu's on two independent power 
feeds with independent backup power. Would we be sufficiently protected?

-- 
Kind Regards,

Netbulae
Jorick Astrego