[Linux-cluster] porblem with quorum at cluster boot

[brem belguebli]

The configuration you are trying to build, 2 cluster nodes (1 vote each)
plus a quorum disk 1 vote (making a total expected votes= 3) must remain up
if you loose 1 of the members (as long as the remaining node still accesses
the quorum disk) because there are still 2   active votes (1 remaining node
+ 1 quorum disk) = 2 > expected_votes/2.

The Quorum (majority) must be greater (absolutely greater  >) than
expected_votes/2 (51% or greater) in order to service to continue.


2010/9/27 Bennie R Thomas <Bennie_R_Thomas at raytheon.com>

> Try setting your expected votes to 2 or 1..
>
> Your Cluster is hanging with one node because it want's 3 votes.
>
>
>
>   From: Brem Belguebli <brem.belguebli at gmail.com> To: linux clustering <
> linux-cluster at redhat.com> Date: 09/25/2010 10:30 AM Subject: Re:
> [Linux-cluster] porblem with quorum at cluster boot Sent by:
> linux-cluster-bounces at redhat.com
> ------------------------------
>
>
>
> On Fri, 2010-09-24 at 12:52 -0400, Jason_Henderson at Mitel.com wrote:
> >
> > I think you still need two_node="1" in your conf file if you want a
> > single node to become quorate.
> >
> two_nodes=1 is only valid if you do not have a quorum disk.
>
> > linux-cluster-bounces at redhat.com wrote on 09/24/2010 12:38:17 PM:
> >
> > > hello,
> > >
> > > I have a 2 node cluster with qdisk quorum partition;
> > >
> > > each node has 1 vote and the qdisk has 1 vote too; in cluster.conf
> > I
> > > have this explicit declaration:
> > > <cman expected_votes="3" two_node="0"\>
> > >
> > > when I have both 2 nodes active cman_tool status tell me this:
> > >
> > > Version: 6.1.0
> > > Nodes: 2
> > > Expected votes: 3
> > > Quorum device votes: 1
> > > Total votes: 3
> > > Node votes: 1
> > > Quorum: 2
> > >
> > > then, if I power off a node these value, as expected, changed this
> > way:
> > > Nodes: 1
> > > Total votes: 2
> > >
> > > and the cluster is still quorate and functional.
> > >
> > > the problem is if I power off both the node and them power on only
> > one
> > > of them: in this case the single node does not quorate and the
> > cluster
> > > does not start: I have to power on both the node to have the
> > cluster
> > > (and services on the cluster) working.
> > >
> > > I'd like the cluster can work (and boot) even with a single node
> > (ie, if
> > > one of the node has hw failure and is down I still want to be able
> > to
> > > reboot the working node and have it booting correctly the cluster)
> > >
> > > any hints? (thank's for reading all this)
> > >
> > > --
> > > bye,
> > > emilio
> > >
> > > --
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