Change high availability Settings

When a pool has high availability enabled, use the Configure HA dialog box to change VM startup settings and the server failure limit for the pool.

To change high availability restart priority and VM startup sequence settings

  1. Select the pool in the Resources pane, choose the HA tab, and then select Configure HA. Alternatively:
    • On the Pool menu, select High Availability.
    • Right-click in the Resources pane and then select High Availability on the shortcut menu.
  2. Select one or more VMs in the list and set the required VM startup settings. For more on these options, see VM startup settings.

    Set the following options:

    • HA restart priority: Choose a restart priority for each VM:
      • Choose Restart to ensure the selected VMs are restarted if sufficient resources are available within the pool.
      • Choose Restart if Possible if it is not essential to restart the VM automatically.
      • Choose Do Not Restart if you never want the VM to be restarted automatically.
    • Start order : Specifies the order in which individual VMs start up during the recovery operation, allowing certain VMs to be started before others. VMs with a start order value of 0 (zero) start first, then VMs with a start order value of 1, and so on.
    • Attempt to start next VM after: Set the delay interval to wait after starting the VM before starting the next group of VMs in the startup sequence. The next group of VMs are those VMs with a lower start order.
  3. Click OK to apply the changes and close the dialog box.

To change the server failure limit for a pool

  1. Select the pool in the Resources pane, select the HA tab, and then click Configure HA. Alternatively:
    • On the Pool menu, select High Availability.
    • Right-click in the Resources pane and then select High Availability on the shortcut menu.
  2. Under Server failure limit, enter the number of server failures to allow. Ensure this value is less than or equal to the maximum failure capacity for the pool, shown here as max. If max is 0 (zero), the pool is overcommitted, and you cannot save the change. To be able to save the change, either adjust the high availability restart priorities or make more resources available within the pool. For more information, see the following section To increase the maximum failure capacity for a pool.
  3. Click OK to apply the changes and close the dialog box.

To increase the maximum failure capacity for a pool

To increase the maximum failure capacity for a pool, you need to do one or more of the following:

  • Reduce the high availability restart priority of some VMs.
  • Increase the amount of RAM on your servers or add more servers to the pool to increase its capacity.
  • Reduce the amount of memory configured on some VMs.
  • Shut down non-essential VMs.