Re: [Users] SPM not selected after host failed

Date: Thu, 20 Sep 2012 17:13:25 +0300 From: Itamar Heim <iheim(a)redhat.com&gt; To: patrick.hurrelmann(a)lobster.de Cc: users(a)ovirt.org Subject: Re: [Users] SPM not selected after host failed Message-ID: <505B2485.9080604(a)redhat.com&gt; 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&lt;patrick.hurrelmann(a)lobster.de&gt; To:users@ovirt.org Subject: Re: [Users] SPM not selected after host failed Message-ID:<505B272F.7000301@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