Defining delayed fallback timers

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A delayed fallback timer lets a resource group fall back to its higher priority node at a specified time. This lets you plan for outages for maintenance associated with this resource group.

You can specify a recurring time at which a resource group will be scheduled to fall back, or a specific time and date when you want to schedule a fallback to occur.

You can specify the following types of delayed fallback timers for a resource group:

  • Daily
  • Weekly
  • Monthly
  • Yearly
  • On a specific date.
Note: It is assumed that the delayed timer is configured so that the fallback time is valid. If the configured time occurs in the past or is not valid, you receive a warning and the delayed fallback policy is ignored. If you use a specific date, the fallback attempt is made only once, at the specified time.

To make a resource group use a delayed fallback policy, follow these steps:

  1. Configure a delayed fallback timer that you want to use. After you have configured the delayed fallback timer, you can use it in one or several resource groups as the default fallback policy. For instructions, see Configuring delayed fallback timers in SMIT.
  2. Select the Fallback to Higher Priority Node option from the picklist of fallback policies for your resource group. You can do so when configuring a resource group.

    For instructions, see Steps for configuring resource groups in SMIT.

  3. Assign a fallback timer to a resource group, by adding it as an attribute to the resource group.

    If the delayed fallback timer entry does not show up in the list of attributes/resources that you can add to a resource group, this indicates that you did not follow the instructions in steps 1 and 2, because PowerHA® SystemMirror® only displays attributes and resources that are valid in each particular case.

    For instructions, see Assigning a delayed fallback policy to a resource group.