[ClusterLabs] Unexpected Resource movement after failover

[Nikhil Utane]

Andrei,

*"It would help if you told which node and which resources, so
your configuration could be interpreted in context. "*

Any resource can run on any node as long as it is not running any other
resource.

*"so "a not with b" does not imply "b not with a". So first pacemaker
decided where to place "b" and then it had to move "a" because it cannot
colocate with "b"."*

Hmm. I used to think "a not with b" means "b not with a" as well. Looks
like that's not the case. That should be it then.

Thanks for the quick answer, guys.

-Nikhil



On Thu, Oct 13, 2016 at 7:59 PM, Andrei Borzenkov <arvidjaar at gmail.com>
wrote:

> On Thu, Oct 13, 2016 at 4:59 PM, Nikhil Utane
> <nikhil.subscribed at gmail.com> wrote:
> > Hi,
> >
> > I have 5 nodes and 4 resources configured.
> > I have configured constraint such that no two resources can be
> co-located.
> > I brought down a node (which happened to be DC). I was expecting the
> > resource on the failed node would be migrated to the 5th waiting node
> (that
> > is not running any resource).
> > However what happened was the failed node resource was started on another
> > active node (after stopping it's existing resource) and that node's
> resource
> > was moved to the waiting node.
> >
> > What could I be doing wrong?
> >
>
> It would help if you told which node and which resources, so your
> configuration could be interpreted in context. But I guess Ulrich is
> correct - your constraints are asymmetrical (I assume, I am not
> familiar with PCS), so "a not with b" does not imply "b not with a".
> So first pacemaker decided where to place "b" and then it had to move
> "a" because it cannot colocate with "b".
>
> > <nvpair id="cib-bootstrap-options-have-watchdog" value="true"
> > name="have-watchdog"/>
> > <nvpair id="cib-bootstrap-options-dc-version" value="1.1.14-5a6cdd1"
> > name="dc-version"/>
> > <nvpair id="cib-bootstrap-options-cluster-infrastructure"
> value="corosync"
> > name="cluster-infrastructure"/>
> > <nvpair id="cib-bootstrap-options-stonith-enabled" value="false"
> > name="stonith-enabled"/>
> > <nvpair id="cib-bootstrap-options-no-quorum-policy" value="ignore"
> > name="no-quorum-policy"/>
> > <nvpair id="cib-bootstrap-options-default-action-timeout" value="240"
> > name="default-action-timeout"/>
> > <nvpair id="cib-bootstrap-options-symmetric-cluster" value="false"
> > name="symmetric-cluster"/>
> >
> > # pcs constraint
> > Location Constraints:
> >   Resource: cu_2
> >     Enabled on: Redun_CU4_Wb30 (score:0)
> >     Enabled on: Redund_CU2_WB30 (score:0)
> >     Enabled on: Redund_CU3_WB30 (score:0)
> >     Enabled on: Redund_CU5_WB30 (score:0)
> >     Enabled on: Redund_CU1_WB30 (score:0)
> >   Resource: cu_3
> >     Enabled on: Redun_CU4_Wb30 (score:0)
> >     Enabled on: Redund_CU2_WB30 (score:0)
> >     Enabled on: Redund_CU3_WB30 (score:0)
> >     Enabled on: Redund_CU5_WB30 (score:0)
> >     Enabled on: Redund_CU1_WB30 (score:0)
> >   Resource: cu_4
> >     Enabled on: Redun_CU4_Wb30 (score:0)
> >     Enabled on: Redund_CU2_WB30 (score:0)
> >     Enabled on: Redund_CU3_WB30 (score:0)
> >     Enabled on: Redund_CU5_WB30 (score:0)
> >     Enabled on: Redund_CU1_WB30 (score:0)
> >   Resource: cu_5
> >     Enabled on: Redun_CU4_Wb30 (score:0)
> >     Enabled on: Redund_CU2_WB30 (score:0)
> >     Enabled on: Redund_CU3_WB30 (score:0)
> >     Enabled on: Redund_CU5_WB30 (score:0)
> >     Enabled on: Redund_CU1_WB30 (score:0)
> > Ordering Constraints:
> > Colocation Constraints:
> >   cu_3 with cu_2 (score:-INFINITY)
> >   cu_4 with cu_2 (score:-INFINITY)
> >   cu_4 with cu_3 (score:-INFINITY)
> >   cu_5 with cu_2 (score:-INFINITY)
> >   cu_5 with cu_3 (score:-INFINITY)
> >   cu_5 with cu_4 (score:-INFINITY)
> >
> > -Thanks
> > Nikhil
> >
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