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тАО10-13-2004 03:21 AM
тАО10-13-2004 03:21 AM
Is this the right process to take?
thanks
Paul
Solved! Go to Solution.
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тАО10-13-2004 04:42 AM
тАО10-13-2004 04:42 AM
Re: remove a quorum disk when adding a 3rd node to cluster
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тАО10-13-2004 04:49 AM
тАО10-13-2004 04:49 AM
Re: remove a quorum disk when adding a 3rd node to cluster
thanks
Paul
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тАО10-13-2004 05:02 AM
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тАО10-13-2004 11:41 PM
тАО10-13-2004 11:41 PM
Re: remove a quorum disk when adding a 3rd node to cluster
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тАО10-14-2004 12:08 AM
тАО10-14-2004 12:08 AM
Re: remove a quorum disk when adding a 3rd node to cluster
The interesting point here is, what value would you assign to EXPECTED_VOTES. Definitely _not_ 3 - otherwise you'll suspend the entire cluster every time you want to reboot a node.
Definitely NOT true. In a cluster with 3 voting members, you can safely set EXPECTED_VOTES to 3. Even if a voting member crashes, the cluster happily continues because of the of the fact that quorum is calculated as:
(sum of all votes of all voting members + 2) / 2
In this case that means:
(3+2)/2 = 2.
So the cluster is happy if 2 voting members (one vote each) are present.
By default AUTOGEN will calculate it as 2 if you have three nodes with 1 vote each.
I'm not sure about that, maybe someone else can shed a light on this.
Still, when you start up the entire cluster, you won't get it running until you bring at least two nodes up.
You have a point there. But in a cluster with three voting members, don't you want at least 2 of them to be present, before you turn over the cluster to the end-users.
Certainly I would.
Greetz,
Kris
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тАО10-14-2004 12:39 AM
тАО10-14-2004 12:39 AM
Re: remove a quorum disk when adding a 3rd node to cluster
Agreed that EXPECTED_VOTES=3 will be OK for two remaining nodes.
> But in a cluster with three voting
> members, don't you want at least 2 of
> them to be present, before you turn over
> the cluster to the end-users.
> Certainly I would.
It depends. Imho, the more time my cluster is available, the better for users. To me, performance is secondary to availability. And consider another situation: you're a system manager doing an upgrade or another change. No chance to check if everything went well until _two_ nodes finished startup. Another point: some upgrades simply require to shut down all other nodes booting from the same system disk. Do you prefer to change EXPECTED_VOTES and reboot every such time?
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тАО10-14-2004 04:49 AM
тАО10-14-2004 04:49 AM
Re: remove a quorum disk when adding a 3rd node to cluster
By the way: there has been a change in behaviour: I don't know when it changed, but I know that in earlier OpenVMS releases a single node was able to form a VMScluster, but then blocked due to not enough votes for quorum. The system manager could then get that node life with a quorum recalculation request through the 'IPC>' mechanism. I have noted that with V7.3-2 a cluster is only formed when enough votes for the quorum are present. Indeed that requires changing EXPECTED_VOTES through a conversational bootstrap, but - as I already wrote - I would NOT hardcode it.
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тАО10-14-2004 05:31 AM
тАО10-14-2004 05:31 AM
Re: remove a quorum disk when adding a 3rd node to cluster
thanks
Paul
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тАО10-14-2004 05:37 AM
тАО10-14-2004 05:37 AM
Re: remove a quorum disk when adding a 3rd node to cluster
Get rid of the quorum disk und give each node VOTES=1 and EXPECTED_VOTES=3.