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

[Andrew Beekhof]

On Mon, Jul 18, 2011 at 6:38 PM, Kulovits Christian - OS ITSC <
Christian.Kulovits at austrian.com> wrote:

> 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?
>

Colocation does not imply ordering.
Groups imply both, but only _within_ a group.


> 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> 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]
> *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> 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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