[ClusterLabs] Increasing Token Timeout Safe By Itself?

[Eric Robinson]

> -----Original Message-----
> From: Jan Friesse <jfriesse at redhat.com>
> Sent: Sunday, January 20, 2019 11:57 PM
> To: Cluster Labs - All topics related to open-source clustering welcomed
> <users at clusterlabs.org>; Eric Robinson <eric.robinson at psmnv.com>
> Subject: Re: [ClusterLabs] Increasing Token Timeout Safe By Itself?
> 
> Eric Robinson napsal(a):
> > I have a few corosync+pacemeker clusters in Azure. Occasionally,
> > cluster nodes failover, possibly because of intermittent connectivity
> > loss, but more likely because one or more nodes experiences high load
> > and is not able to respond in a timely fashion. I want to make the
> > clusters a little more resilient to such conditions (i.e., allow
> > clusters more time to recover naturally before failing over). Is it a
> > simple matter of increasing the totem.token timeout from the default
> > value? Or are
> there other things that should be changes as well? And once the value is
> increased, how do I make it
> 
> Usually it is really enough to increase totem.token. Used token timeout is
> computed based on this value (see corosync.conf man page for more
> details). It's possible to get used value by executing "corosync-cmapctl
>   -g runtime.config.totem.token" command.
> 
> active without restarting the cluster?
> 
> You can ether edit config file (ideally on all nodes) and exec "corosync-cfgtool
> -R" (just on one node) or you can use "corosync-cmapctl  -s totem.token u32
> $REQUIRED_VALUE" (ideally on all nodes). Also pcs/crmshell may also
> support this functionality.
> 
> Honza
> 

Thank you very much for the feedback!

--Eric