[Pacemaker] Adding Cluster Nodes in Pacemaker "Configuration Explained"

[Andrew Beekhof]

On Wed, Oct 21, 2009 at 1:48 PM, Colin <colin.hch at gmail.com> wrote:
> Let's see whether I can summarise correctly:

basically all correct

>
> For Pacemaker + CoroSync/OpenAIS, the Pacemaker attribute
> "expected-quorum-votes" tells the cluster how many votes it needs for
> quorum. (What happens when the option is not set?)

The cluster sets it for you based on how many nodes it can see.

> For Pacemaker + Heartbeat, the Pacemaker attribute
> "expected-quorum-votes" is ignored, and Heartbeat's idea of quorum is
> used, i.e. (a) for a two-node cluster (list of cluster nodes has two
> entries as per "cl_status listnodes") every node that is up and
> running believes to have quorum, whether alone or not, and (b) for an
> n-node cluster with n greater than two a partition with strictly
> greater than 50% of the nodes has quorum. (IIRC (a) can be changed by
> making the vote more complicated,

i don't believe this is possible but may be mistaken

> but I'm not interested in two-node
> clusters and did not look into this.)
>
> Regards, Colin
>
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