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qdisk and voting in RHEL4 CS (Re: [Linux-cluster] Is heuristic really required?)



On Thu, 24 Apr 2008, Lon Hohberger wrote:

> On Wed, 2008-04-23 at 16:11 -0400, Charlie Brady wrote:
> > On Fri, 18 Apr 2008, HarriPäiväniemi wrote:
> > 
...
> 
> > Another thing I've noticed (with RHEL4 RHC) is the the quorum disk doesn't 
> > show up in the node list of the first node set up in the cluster, and 
> > doesn't contribute a vote. Anyone have any ideas about that?
> 
> It's not really a node, and is not reported by CMAN in the nodes list as
> it is in RHEL5/STABLE2 branches.

Not so, it is sometimes reported by cman in the nodes list. Herewith the 
/proc/cluster/nodes file from four nodes of a cluster, each with qdiskd 
running:


[root g5node11 ~]# for i in 12 14 16 18 ; do ssh 192.168.10.$i cat /proc/cluster/nodes ; done
Node  Votes Exp Sts  Name
   1    1    1   M   g5node11
   2    1    3   M   g5node12
   3    1    5   M   g5node13
   4    1    7   M   huys3
Node  Votes Exp Sts  Name
   0    1    0   M   /dev/sda1
   1    1    1   M   g5node11
   2    1    3   M   g5node12
   3    1    5   M   g5node13
   4    1    7   M   huys3
Node  Votes Exp Sts  Name
   0    2    0   M   /dev/sda1
   1    1    1   M   g5node11
   2    1    3   M   g5node12
   3    1    5   M   g5node13
   4    1    7   M   huys3
Node  Votes Exp Sts  Name
   0    3    0   M   /dev/sda1
   1    1    1   M   g5node11
   2    1    3   M   g5node12
   3    1    5   M   g5node13
   4    1    7   M   huys3
[root g5node11 ~]#

I'm guessing that the order of startup or of adding nodes to the cluster 
is responsible for the non-appearance of qdisk on one node, and the 
varying votes on other nodes, but I'd appreciate some better 
understanding, and a workaround or fix if someone can provide it.

--
Charlie



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