Hi, On Thu, May 20, 2010 at 06:30:15PM +0100, Alexander Fisher wrote: > On 19 May 2010 12:20, Dejan Muhamedagic <[email protected]> wrote: > > On Wed, May 19, 2010 at 11:10:06AM +0100, Alexander Fisher wrote: > >> On 19 May 2010 10:55, Dejan Muhamedagic <[email protected]> wrote: > >> > Hi, > >> > > >> > On Tue, May 18, 2010 at 06:24:34PM +0100, Alexander Fisher wrote: > >> >> > We have a pair of servers in a cluster plugged into a pair of APC > >> >> > rack-mounted PDU's of the sort that could be controlled by this > >> >> > stonith > >> >> > plugin. My problem is that these are dual power supply servers, which > >> >> > means I would have to shut down two outlets that are on on two > >> >> > different > >> >> > PDUs to completely power off one of the nodes. Is it possible to use > >> >> > this stonith plugin to do that? The documentation on configuring > >> >> > outlet > >> >> > numbers (from "crm ra info stonith:external/rackpdu") is a bit sparse; > >> >> > it isn't clear that what I want to do is even possible. > >> >> > > >> >> > --Greg > >> >> > >> >> Hi Greg. > >> >> > >> >> I'm in the process of setting up exactly the same thing. > >> >> Do you know that on APC PDUs, you can group outlets across several > >> >> physical PDUs? I've got a bit more testing to do, but this seems to > >> >> work ok. > >> >> The plugin is configured to talk to just one outlet on one of the PDUs > >> >> and the > >> >> PDU does the rest. > >> > > >> > That's cool. Do you have a link to the documentation describing > >> > this. > >> > >> http://www.apcmedia.com/salestools/ASTE-6Z6KAV_R1_EN.pdf > >> > >> "A global outlet group consists of one or more outlets on a Switched Rack > >> PDU. > >> One outlet is configured as a global outlet, which logically links the > >> outlet group to > >> outlet groups on up to three other Switched Rack PDUs. All outlets in the > >> linked > >> global outlet groups are synchronized." > > > > There's now a README for the rackpdu which mentions this feature > > and contains relevant URLs. Many thanks! > > > > Cheers, > > > > Dejan > > Hi Again. > > A word of warning. If the two PDUs can't communicate (perhaps a > switch is down or a bad cable) > and you fire the reset command at the PDU you can talk to, it'll > appear to have worked > (from the clusters perspective), but obviously won't.
That's really bad. Is the firmware up to date? At any rate, you should report this to the vendor. Thanks, Dejan > I don't know how worried about this I should be. Should I be worried > about stonith working if I've > got a switch failure? > > I think I'll use IPMI and rackpdu in the same configuration. > If I connect both PDUs to the same switch and all IPMI ports to the > other, I *think* everything will be fine, > in the event of either a switch failure or a power failure leading to > one dead PDU and one dead switch. > > I think I need to draw a diagram! :) > > Is this a text only mailing list or can I attach images (my ascii art sucks)? > > Kind regards, > Alex > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
