topic Re: toc in cluster nodes in Operating System - HP-UX

toc in cluster nodes

Shivkumar — Wed, 17 May 2006 19:32:54 GMT

Hi,

In case of 2 cluster nodes if a node develope some problem then is it desirable if one node goes for TOC ?

Thanks,
Shiv

Re: toc in cluster nodes

James R. Ferguson — Wed, 17 May 2006 19:47:46 GMT

Hi Shiv:

Yes, in a 2-node cluster, failure to detect a heart-beat will result in one node undergoing a TOC (Transfer-of-Control, or reboot) thereby allowing the remaining node to acquire all resources and packages.

Regards!

...JRF...

Re: toc in cluster nodes

A. Clay Stephenson — Wed, 17 May 2006 23:09:45 GMT

It depends upon the nature of the problem but as has already been said if no heartbeat is detected then one of the nodes should die -- otherwise, imagine both nodes trying to activate the same VG and mount filesystems. Also on a two-node cluster you now do not node have quorum and this is why a 2-node cluster must use a quorum server or lock disk -- to avoid split-brain syndrome. On the other hand if a simple disk failure occurred (possibly the boot disk) then this should be a complete non-event on either node and even the node with the failed disk shouldn't care because I'm sure that you mirrored it. Right?