Date: Thu, 20 Sep 2012 17:13:25 +0300 From: Itamar Heim
<[email protected]> To: [email protected] Cc:
[email protected] Subject: Re: [Users] SPM not selected after host
failed Message-ID: <[email protected]> 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<[email protected]>
To:[email protected]
Subject: Re: [Users] SPM not selected after host failed
Message-ID:<[email protected]>
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
