6.0.1

Option Description
Response for Datastore with
Permanent Device Loss (PDL)
This setting determines what VMCP does in the case of a PDL failure. You
can choose to have it Issue Events or Power off and restart VMs.
Response for Datastore with All
Paths Down (APD)
This setting determines what VMCP does in the case of an APD failure.
You can choose to have it Issue Events or Power off and restart VMs
conservatively or aggressively.
Delay for VM failover for APD
This setting is the number of minutes that VMCP waits before taking
action.
Response for APD recovery after
APD timeout
You can choose whether or not VMCP resets a VM in this situation.
VM monitoring sensitivity
Set this by by moving the slider between Low and High. You can also
select Custom to provide custom settings.
5 Click OK.
Your Virtual Machine Response settings take effect.
Configure Admission Control
After you create a cluster, admission control allows you to specify whether virtual machines can be started if
they violate availability constraints. The cluster reserves resources to allow failover for all running virtual
machines on the specified number of hosts.
The Admission Control page appears only if you enabled vSphere HA.
Procedure
1 In the vSphere Web Client, browse to the vSphere HA cluster.
2 Click the Manage tab and click Settings.
3 Under Settings, select vSphere HA and click Edit.
4 Expand Admission Control to display the configuration options.
5 Select an admission control policy to apply to the cluster.
Option Description
Define failover capacity by static
number of hosts
Select the maximum number of host failures that you can recover from or
to guarantee failover for. Also, you must select a slot size policy.
Define failover capacity by
reserving a percentage of the
cluster resources
Specify a percentage of the cluster’s CPU and Memory resources to reserve
as spare capacity to support failovers.
Use dedicated failover hosts
Select hosts to use for failover actions. Failovers can still occur to other
hosts in the cluster if a default failover host does not have enough
resources.
Do not reserve failover capacity
This option allows virtual machine power-ons that violate availability
constraints.
6 Click OK.
Admission control is enabled and the policy that you chose takes effect.
Configure Datastore for Heartbeating
vSphere HA uses datastore heartbeating to distinguish between hosts that have failed and hosts that reside
on a network partition. Datastore heartbeating allows vSphere HA to monitor hosts when a management
network partition occurs and to continue to respond to failures that occur.
You can specify the datastores that you want to be used for datastore heartbeating.
vSphere Availability
36 VMware, Inc.