37
Figure 30. The properties of HP-Boulder-IT-HeartBeat
Configuring the resource pool for HA
XenServer HA maintains a failover plan that defines the response to the failure of one or more
XenServer hosts. To configure HA functionality for a resource pool, select the Pool menu option in
XenCenter and click High Availability. The Configure HA wizard now guides you through the setup,
allowing you, for example, to specify the heartbeat SR, HP_Boulder-IT-HeartBeat, as shown in Figure
31.
As part of the setup, you can specify HA protection levels for VMs currently defined in the pool.
Options include:
Protect – The “Protect” setting ensures that HA has been enabled for VMs. Protected VMs are
guaranteed to be restarted first if sufficient resources are available within the pool.
Restart if possible – VMs with a “Restart if possible” setting are not guaranteed to be restarted
following a host failure. However, if sufficient resources are available after protected VMs have
been restarted, “Restart if possible” VMs will be restarted on a surviving pool member.
Do not restart – VMs with a “Do not restart” setting are not restarted following a host failure.
If the resource pool does not have sufficient resources available, even protected VMs are not
guaranteed to be restarted. XenServer will make additional attempts to restart VMs when the state of
