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Re: [Linux-cluster] A few GFS newbie questions: journals, etc



On Fri, 2005-06-24 at 15:12 -0500, Nate Carlson wrote:
> On Wed, 8 Jun 2005, Lon Hohberger wrote:
> > (a) a totally asymmetric setup: one node having 21 votes, all others 
> > having 1.  If the node with 21 votes goes down, everyone loses quorum 
> > though, and no one can access the file system.
> 
> Y'know, coming back to this.. instead of using gulm, would it be possible 
> for me to set up a cluster where the physical nodes (4) have like 50 votes 
> each, and the VM's have 1 vote each? That way, I could lose one of the 
> physical nodes, and still have a quorum, right?

Yes, as long as more than half the VMs were on the surviving node as
well...

If exactly half of the nodes votes disappear, a quorum no longer exists
(except in the 2-node special case).  Suppose there were 4 VMs:

   2 x 50 votes = 100 votes
     4 x 1 vote =   4 votes
          Total = 104 votes
---------------------------
Need for quorum =  53 votes

-- Lon


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