Jonathan E Brassow wrote: > Looking at the cman_tool man page, I don't see a way to change the > heartbeat interval. Dave, is there a way to change this while cman is > part of a cluster? > > To change the in memory version number or expected votes for cman, you > would: > > 1) change cluster.xml file > 2) ccs_tool update <new xml file> > 3) cman_tool version -r <new #> ; cman_tool expected -e <new expected #> > > If cman_tool can change the heartbeat interval without restarting the > cluster (or cman on each machine), it would look very much like step > #3. This can not be done through the GUI, because the GUI only changes > the in memory version number. A reply for the list: The heartbeat & detection intervals for cman can be set by writing values into /proc/cluster/conf/cman/hello_timer & /proc/cluster/conf/cman/deadnode_timer These values are in seconds and take effect immediately (-ish, ie the new hello timer will take effect after the last hello timer has expired). Because these really need to be the same on all nodes I don't recommend changing them on-the-fly though - they should be set between loading the module and running cman_tool join. There is also /proc/cluster/conf/cman/max_retries which some may like to increase if they are seeing "No response to messages" reasons for a node being kicked out of the cluster - you can change this any time you like with no ill effects. The version of cman_tool on the STABLE tag of CVS has code that will read these values from CCS when "cman_tool join" is run. I think this should be in a future RHEL4 Update. -- patrick -- Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
