Being the chickensh*t that I am when it comes to upgrading production machines, I gave things a few days before upgrading a CentOS 5.5 pacemaker-1.0.10 / corosync-1.2.7 cluster to CentOS 5.6 (so that I can see what, if anything, was going wrong with other installations). Echoing other peoples' experiences, this has gone absolutely painlessly. Thanks and kudos to the CentOS team. And doing a painless rolling upgrade on the cluster, thus minimizing the service outage to a few tens of seconds was *really* nice. Devin -- Place your clothes and weapons where you can find them in the dark. - Robert Heinlein