Hi Andreas, On Wednesday 13 August 2008 11:07:18 Andreas Mock wrote: > Hi Andreas, > > > -----Ursprüngliche Nachricht----- > > Von: "Andreas Kurz" <[EMAIL PROTECTED]> > > Gesendet: 12.08.08 22:27:30 > > An: "General Linux-HA mailing list" <[email protected]> > > Betreff: Re: [Linux-HA] STONITH, default fencing time, forced-fencing > > > > Of course ... one instance should be enough but isn't it safer to make > > sure that every node is able to stonith any other node ... no matter in > > which state the complete cluster is? > > I thought this too longtime ago. I ended also configuring stonith as > separate primitive resource for each node and constraints forcing a sonith > plugin not to run on its controlled node. > > Why this: In my case (and I'm pretty sure that's also valid for other > scenarios) the stonith device can only serve exactly ONE connection. That > means only one user/plugin can connect to the stonith device at a time. As > soon as I used clones I couldn't guarantee that only one clone connects to > the stonith device at one time. The monitor action is implemented as a > connection attempt with gathering some more or less meaningful status > information. > I got many (wrong) monitoring failures. And therefore using clones was not > appropriate. > > Stonith plugin contributors should test and document if the plugin is > "clone-aware".
Mhm ... yes, this seems to be a problem for some stonith devices. I also saw such a behavior sometimes. Personally I always thought the main idea of running a stonith clone makes sense for multi (>2) node cluster ... in theory ;-) > > Another issue is that on a two node cluster the usage of clones where the > clone instance running on the node it can't shoot (suicide forbidden) is > IMHO more or less the same as using one primitive stonith ressource and > an appropriate constraint avoiding a wrong node/stonith assignment. I agree .. for two nodes one primitive stonith ressource per node with a location constraint is also my preferred way of configuration. > > By the way: I really never got the feeling to understand the stonith > subsystem and its behaviour more that 60%. Probably I/we have to take Dejan > for one or more beer and asking him anything we don't know about this. > :-)) Good plan! ... I think rather more than only one beer is needed to understand all ;-) Regards, Andreas > > Best regards > Andreas Mock > > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems -- : Andreas Kurz Tel +43-1-8178292-64 : : LINBIT® Information Technologies GmbH Fax +43-1-8178292-82 : : Vivenotgasse 48, A-1120 Vienna/Europe http://www.linbit.com : DRBD® ist eine eingetragene Marke der LINBIT® Information Technologies GmbH. DRBD® is a registered trademark of LINBIT® Information Technologies GmbH. _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
