[ClusterLabs] Serialize and symmetrical=true does not work together

Ken Gaillot kgaillot at redhat.com
Mon Mar 16 19:58:40 EDT 2020

It has always been the case that symmetrical=true was ignored (with a
warning) for serialized constraints; the only recent change was making
false the default so the warning wouldn't be displayed.

If you want the services to start and stop in a particular order, you
don't want a serialized constraint, just a regular order constraint. A
serialized constraint merely says that the actions can't be done at the
same time, either one may be done first.

If you have a serialized constraint saying the resources can't start at
the same time, and want that to apply to stops as well, then you can
create a second serialized constraint explicitly specifying stop as the
action to be ordered.

On Mon, 2020-03-16 at 19:41 +0530, Dileep V Nair wrote:
> Hi,
> I have pacemaker clusters which were working fine with Serialize and
> symmetrical=true together. After an upgrade, I see that Serialize
> does not work with symmetrical=true. How do I make sure the resources
> in Serialize stop in reverse order of start ? All the clusters are
> already in production. Please help.
> Thanks & Regards
> Dileep Nair
> Squad Lead - SAP Base 
> Togaf Certified Enterprise Architect
> IBM Services for Managed Applications
> +91 98450 22258 Mobile
> dilenair at in.ibm.com
> IBM Services
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Ken Gaillot <kgaillot at redhat.com>

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