Hi, On Tue, 2010-08-17 at 10:52 -0400, Ben Turner wrote: > Rolling update from 5.x zstream to 5.x+1 should work. For example 5.5z to > 5.6 should work with rolling updates but 5.4 to 5.6 may have problems. >
Just be sure to keep cman and lvm2-cluster in sync on a single node (i.e. update _both_ to current versions). Otherwise you'll lose your clustered (GFS/GFS2) file systems due to breaking internal API changes (socket where clvmd reads/writes from). This means you _will_ need access to cluster and cluster-storage repos in RHN. Current CMAN in RHEL5.5 updates will break clustered file systems if you do not have the appropriate lvm2-cluster rpm to match. See the changelog on cman for details. > -Ben > > > > ----- Original Message ----- > From: "Mikko Partio" <[email protected]> > To: "linux clustering" <[email protected]> > Sent: Saturday, August 14, 2010 1:18:51 AM GMT -05:00 US/Canada Eastern > Subject: Re: [Linux-cluster] Guidelines on Upgrades > > > > > > On Sat, Aug 14, 2010 at 12:11 AM, Robert Hayden < [email protected] > > wrote: > > > Looking for guidelines on when RHCS components can be upgraded in a rolling > fashion and when it is best to simply take a full cluster downtime. I am > looking at 2-6 node clusters with each node providing a unique set of > functions along with common functions. Each node has a dedicated failover > node(s). > > A couple of examples: > Minor OS upgrades, e.g. RHEL 5.3 to RHEL 5.5 > Major OS upgrades, e.g. RHEL 5.x to RHEL 6.x > Errata for key cluster component, e.g. openais, cman, etc, without kernel > updates > > > > My understanding is that major upgrade require rebuilding the cluster from > scratch, ie. no upgrade is possible. And with minor upgrades, I've tried > doing rolling upgrades and sometime they do work and sometime don't. The > problem is that you don't know which upgrades will work, so my current > approach is just to upgrade the whole cluster at a time. Sure, requires some > downtime (5-15 minutes) but that's better than having a freezed cluster > requiring hours of work to get back online. > > > Just my $0.02. > > > Regards > > > Mikko > -- > Linux-cluster mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/linux-cluster > > -- Best Regards, Brett Delle Grazie ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ -- Linux-cluster mailing list [email protected] https://www.redhat.com/mailman/listinfo/linux-cluster
