[ClusterLabs] Early VM resource migration

[Klechomir]

On 16.12.2015 17:52, Ken Gaillot wrote:
> On 12/16/2015 02:09 AM, Klechomir wrote:
>> Hi list,
>> I have a cluster with VM resources on a cloned active-active storage.
>>
>> VirtualDomain resource migrates properly during failover (node standby),
>> but tries to migrate back too early, during failback, ignoring the
>> "order" constraint, telling it to start when the cloned storage is up.
>> This causes unnecessary VM restart.
>>
>> Is there any way to make it wait, until its storage resource is up?
> Hi Klecho,
>
> If you have an order constraint, the cluster will not try to start the
> VM until the storage resource agent returns success for its start. If
> the storage isn't fully up at that point, then the agent is faulty, and
> should be modified to wait until the storage is truly available before
> returning success.
>
> If you post all your constraints, I can look for anything that might
> affect the behavior.
Thanks for the reply, Ken

Seems to me that that the constraints for a cloned resources act a a bit 
different.

Here is my config:

primitive p_AA_Filesystem_CDrive1 ocf:heartbeat:Filesystem \
         params device="/dev/CSD_CDrive1/AA_CDrive1" 
directory="/volumes/AA_CDrive1" fstype="ocfs2" options="rw,noatime"
primitive VM_VM1 ocf:heartbeat:VirtualDomain \
         params config="/volumes/AA_CDrive1/VM_VM1/VM1.xml" 
hypervisor="qemu:///system" migration_transport="tcp" \
         meta allow-migrate="true" target-role="Started"
clone AA_Filesystem_CDrive1 p_AA_Filesystem_CDrive1 \
         meta interleave="true" resource-stickiness="0" 
target-role="Started"
order VM_VM1_after_AA_Filesystem_CDrive1 inf: AA_Filesystem_CDrive1 VM_VM1

Every time when a node comes back from standby, the VM tries to live 
migrate to it long before the filesystem is up.

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