[Info-vax] troubles with quorum disk

[Ken Fairfield]

On Tuesday, January 8, 2013 6:16:17 AM UTC-8, Pierre wrote:
> On Monday, January 7, 2013 11:07:57 PM UTC+1, Michael Moroney wrote:
[...]
> > You have EXPECTED_VOTES=3 yet you have 2 votes for the quorum
> > disk and 1 for each cluster member.  This adds up to 4, not
> > 3.
> > 
> > With QDSKVOTES=2, your cluster cannot run unless you have 
> > your quorum disk's votes.
> 
> that's the idea. I want my cluster to run with at least one
> node but the quorum disk is mandatory. hence the nodes voting
> 1, the QD voting 2 and the expected votes 3.

I think you need to go back and look at the docs for how quorum
is calculated.  You really should just give the quorum disk
one vote and you're all set.

Quorum=((expected_votes/2) + 1) = 2.  So with qdisk_votes=1,
expected_votes=3, quorum = ((3/2)+1) = 1+1 = 2.  With each
node having one vote, you can successfully boot, i.e., and
establish quorum with one node + quorum disk, *and* you can
maintain quorum with just the two nodes should the quorum
disk go belly-up (or otherwise need to be dismounted or 
replaced, etc.).

The misunderstanding of quorum calculations has made this
far more complicated than it needed to be...

    -Ken