On 01/09/15 09:27 AM, Michael Schwartzkopff wrote: > Hi, > > perhaps this question was answered elsewhere, but I count not find any > satisfying answer. So is it possible to set uo a corosync/pacemaker cluster > that detects errors and does the failover in a sub-second time span? > > if yes, how? > > > Mit freundlichen Grüßen, > > Michael Schwartzkopff
Corosync declares a loss of a node, so you would need to start by tuning it (token loss timeout and loss count). Of course, as you tighten this up, the chances of a transient issue causing false declaration of node loss increases. Next, you'd need a fence device that can terminate and verify the node's termination very, very quickly. I do not know of such a device. Part of this is also the time taken for the fence agent to be invoked. Last, you'd need to have pacemaker calculate the new desired state and make those changes. The services being recovered would need to start exceptionally quickly. In theory, it's possible I suppose. In practice, very unlikely. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ Users mailing list: [email protected] http://clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
