Ocfs2 users - Jan 2007 - Question about taking down a cluster

Can someone correct me on my understanding of the order to take down a cluster?

Lets say I have a server exporting a drive via iscsi, and 4 nodes
connecting to it.

Now I want to shutdown all my machines to do maintenance or what have you.

So I shutdown one, then two. But how does the quorum(sp?) work? If I
am down to only 2 servers up and running will they fence? I read
something about the lowest number node having more votes or something
like that?

Do I need to shut my nodes down in reverse order of what node # they
are in the cluster.conf so that the node id 0 is the last of the nodes
to be shut down?

Or am I just completely off on all of this?

On Tue, Jan 30, 2007 at 11:08:20PM -0800, Brandon Lamb
wrote:
> So I shutdown one, then two. But how does the quorum(sp?) work? If I
> am down to only 2 servers up and running will they fence? I read
> something about the lowest number node having more votes or something
> like that?
If you do a regular shutdown (via umount), there should be no fencing - the
node shutting down communicates to the others so that they expect it to
disappear shortly.

The quorum calculation only comes into play when nodes unexpectedly lose
network communication with each other.

> Do I need to shut my nodes down in reverse order of what node # they
> are in the cluster.conf so that the node id 0 is the last of the nodes
> to be shut down?
No shutdown order is required - just be sure that the iscsi stack doesn't
shut down before ocfs2 is unmounted :)
	--Mark

--
Mark Fasheh
Senior Software Developer, Oracle
mark.fasheh@oracle.com