[Pacemaker] live migration and colocation with lvm cloneset issue

[denis bonnenfant]

Hi,

I have an issue with live migration of   a xen resource  over a clvm vg :

- a lvm vg (cl_LVM1) cloned resource is defined on both nodes,
- a xen resource (res_Xen_dns4) is using a lv from vg1, availiable on 
both nodes,
- a colocation constraint is defined between domu and vg1

When I try to live migrate res_Xen_dns4 from crm, it stops and restarts 
cloned instances of vg1, swapping them between nodes ! underlying drbd 
is demoted... Of course, this operation crashes all the other VMs 
connected to vg1, and finally all the cluster is fencing...

Maybe I'm completely wrong, but I don't understand this behavior ! I 
guessed that the colocation constraints were defined with any clone 
member, and didn't force the clones to move. Did I missed something 
important ?

Thanks in advance for any help,

Denis




the relevant cib is something like :

primitive res_LVM_1 ocf:heartbeat:LVM \
         params volgrpname="xen-data" \
         operations $id="res_LVM_1-operations" \
         op start interval="0" timeout="30" \
         op stop interval="0" timeout="30" \
         op monitor interval="10" timeout="60" start-delay="0" \
         op methods interval="0" timeout="5" \
         meta target-role="started"
primitive res_Xen_dns4 ocf:heartbeat:Xen \
         params xmfile="/etc/xen/dns4.diderot.org" 
allow_mem_management="false" \
         operations $id="res_Xen_dns4-operations" \
         op start interval="0" timeout="60" \
         op stop interval="0" timeout="40" \
         op monitor interval="10" timeout="30" start-delay="0" \
         op migrate_from interval="0" timeout="120" \
         op migrate_to interval="0" timeout="120" \
         meta allow-migrate="true"
**clone cl_LVM_1 res_LVM_1 \
         meta clone-max="2" notify="true" interleave="true" 
resource-stickiness="100"
**colocation col_res_Xen_dns4_cl_LVM_1 inf: res_Xen_dns4 cl_LVM_1
order ord_cl_LVM_1_res_Xen_dns4 inf: cl_LVM_1 res_Xen_dns4

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