Hello Mark,

Am Freitag, den 08.05.2009, 14:21 +0100 schrieb Mark Sutton:
> On 20 Apr 2009, at 11:12, er krishna wrote:
> 
> > I am trying to setup NFS failover and its recovery via GFS (using  
> > CMAN) tool. Of course, I have created a gfs file system over my  
> > logical volume ( basically its on exported block devices ). I have  
> > three nodes centos, centos1 and centos2. I am attaching my  
> > cluster.conf file for further reference. Everything seems fine, but  
> > I am not able to migrate my NFS services when I poweroff my first  
> > node. Anybody has any idea about it ?
> >
> 
> A quick glance at your cluster.conf suggests you're not telling cman  
> how many votes to require for quorum. I'm not sure what the behaviour  
> of cman is in these conditions but it might well be setting  
> expected_votes to the total number of nodes in your cluster ie 3. So  
> if one node went down then the cluster would lose quorum and any  
> cluster operations including failover will fail.
> 
> <cman/>
> 
> For a 3 node cluster I guess expected_votes would be best at 2, so  
> maybe try changing your cman line to this:
> 
> <cman expected_votes="2" />

cman does the right thing by default so there is no need to specify it.

In this case it also wouldn't make any difference at all:

quorum =  floor( expected_votes / 2 ) + 1

2 in booth cases.

> And that might fix it... Of course this thread is a little old now,  
> you might have already fixed the problem...
> 
> Hope this helps,
> 
> Mark

Marc


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