[Pacemaker] Group not started/stopped in correct order with -INF collocation

[Kulovits Christian - OS ITSC]

Hi Andrew,

But whats about the -Inf collocation. The groups must not be active on the same node. This implies an order in shutting down and starting up, isn´t it? On the other hand, if both groups gets started on different nodes there should not be any order dependency since startup of one group may last a long time and the other should not wait that time.

Regards, Christian

From: Andrew Beekhof [mailto:andrew at beekhof.net]
Sent: Dienstag, 05. Juli 2011 03:46
To: The Pacemaker cluster resource manager
Subject: Re: [Pacemaker] Group not started/stopped in correct order with -INF collocation


On Fri, Jul 1, 2011 at 7:23 PM, Kulovits Christian - OS ITSC <Christian.Kulovits at austrian.com<mailto:Christian.Kulovits at austrian.com>> wrote:
Hello Andrew,

No, there are no ordering constraint between the groups!

Then how is pacemaker supposed to know there is a start/stop order that should be observed?

Regards, Christian

From: Andrew Beekhof [mailto:andrew at beekhof.net<mailto:andrew at beekhof.net>]
Sent: Freitag, 01. Juli 2011 09:31

To: The Pacemaker cluster resource manager
Subject: Re: [Pacemaker] Group not started/stopped in correct order with -INF collocation


On Tue, May 31, 2011 at 10:05 PM, Kulovits Christian - OS ITSC <Christian.Kulovits at austrian.com<mailto:Christian.Kulovits at austrian.com>> wrote:
Hello,
In a 2-node cluster two groups (prod, test) are defined with a collocation score="-INFINITY". When the node running the group prod failed, the test group on the other node was stopped and the prod group was started. After the failed node was online again, the prod group was moved to the other node. BUT the test group was first started, then the prod group was stopped and started on the other node. There was a very short time where both groups were active on the same node.

Do you have an ordering constraint between them?

We use a RA to set the home directory for some users, and so the path gets first set and then unset by this sequence. There is no order defined between these groups to enable parallel starts on different nodes.
Is this a definition problem or a bug. Nevertheless this behavior looks strange for me!

Kind regards, Christian

Mit freundlichen Grüßen / with best regards
Christian Kulovits
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