On 09/20/2012 04:36 PM, users-request(a)ovirt.org wrote: > 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 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?