On Nov 22, 2007, at 5:02 PM, Remigiusz Stachura wrote:
Hi,
I have created a simple two-node cluster with 2 multi-state drbd
resources on each node. All these resources must be promoted
to master state on the same node because they are filesystem for
Xen DomU. There is no necessery live migration so I use DRBD 7.x and
the most fresh HA 2.1.2-21 working on SLES10 SP1.
My problem still is to have the rule which make:
-if one of the drbd resources fail on the primary node,
on the secondary node all drbd resources schould be promoted to
master.
I have created rsc_colocation:
<rsc_colocation id="drbd0_drbd1_master" to="ms-drbd1" to_role="master"
from="ms-drbd0" from_role="master" score="INFINITY/>
After putting it to cib.xml I get stange effect - one of the resources
on secondary node stop running:
- node1: ms-drbd0 - master, ms-drbd1 - master
- node2: ms-drbd0 - not running, ms-drbd1 - slave.
After removing the colocation everything works like before.
I'am puting result of: cibadmin -Ql to the file cib2_check.xml
this was fixed in http://hg.beekhof.net/lha/crm-dev/rev/9af5f1170cf4
and will be in the next interim release shortly
The second problem:
I have created location constraint which should prefer one node for
promoted drbd resource. Is it valid rsc_location constraint?
<rsc_location id="location_drbd0" rsc="ms-drbd0">
<rule id="prefered_location_drbd0" score="100" boolean_op="and" >
<expression attribute="#uname" id="drbd0_on_sles225" operation="eq"
value="sles225"/>
<expression attribute="#role" id="drbd0_in_role__master"
operation="eq" value="Master"/>
</rule>
</rsc_location>
<cib2_check.xml>
no, this is what you want instead
<rsc_location id="location_drbd0" rsc="ms-drbd0">
<rule id="prefered_location_drbd0" score="100" boolean_op="and"
role="Master">
<expression attribute="#uname" id="drbd0_on_sles225" operation="eq"
value="sles225"/>
</rule>
</rsc_location>
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