HP 3PAR StoreServ Cluster Extension Software Administrator Guide (5697-2442, July 2013)

3. The cluster node which owns the CSV disk fails or the CSV disk fails and the CSV disk moves
to a node in the same datacenter or CSV disk is moved manually to a node in the same
datacenter:
In this scenario, since the CSV disk is moved to a node in the same datacenter, all the VMs
continue to run on their respective cluster nodes. There will not be any change in the ownership
for the VMs.
4. The cluster node which owns the CSV disk fails or the CSV disk fails and the CSV disk moves
to a node in the remote datacenter or CSV disk is moved manually to a node in the remote
datacenter:
In this scenario, all the VMs which are configured with CLX feature for VM management will
wait for the CSV disk to come online on a cluster node in the remote datacenter. Since the
CSV disk is moved to a node in the remote datacenter, all the VMs which are running in the
respective cluster nodes in the primary datacenter will be live migrated by CLX to cluster nodes
in the remote datacenter. Every role has next preferred node property. Selection of the target
node for the live migration will be based on how the next preferred owner property has been
set for the VM role.
Preferred Owners is not set: In this scenario, the next preferred owner node will be selected
randomly among the cluster nodes which are there in the remote datacenter. The selected
cluster node should be up. If not, search will continue until a cluster node is found in the remote
datacenter.
Preferred Owners is partially set: In this scenario, cluster nodes which are not part of the next
preferred owner node property, will be added to the list in the order of NodeID. Next preferred
owner which is in the same datacenter as the datacenter where CSV disk is owned will be
selected from that list. The selected cluster node should be up. If not, search will continue in
the list until a cluster node is found in the remote datacenter.
Preferred Owners is completely set: Since all cluster nodes are part of the next preferred owner
node property list, the next preferred owner node will be selected from this list. The selected
cluster node should be up and should be in the same datacenter as the datacenter where CSV
disk is owned. If not, search will continue in the list until a cluster node is found in the remote
datacenter.
5. When VM owning node goes down and the VM moves to a node in the remote datacenter:
In this scenario, the VM fails to come online on the remote datacenter and the cluster tries to
bring it online on a node in the local datacenter.
6. When VM owning node goes down and the VM moves to the next preferred node in the same
datacenter:
In this scenario, the VM tries to come online on the next preferred node in the same datacenter.
48 Configuring HP 3PAR StoreServ Cluster Extension