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sol14515: The Force to Standby feature should not be used when the HA group feature is enabled
InformationalInformational

Original Publication Date: 08/08/2013
Updated Date: 11/13/2014

Summary

The high availability (HA) groups feature is designed to assign the active system without user intervention. Therefore, the operator of a BIG-IP system should not attempt to manually control HA operation by using the Force to Standby feature while the HA group feature is enabled. The HA group feature may override the active/standby state and may reassign the active system automatically.

Recommendations

If a manual change of the active state is required, F5 recommends that you disable the HA group feature before forcing the active system to standby. Alternatively, you can take the active system offline temporarily. To do so, perform one of the following procedures.

Disabling the HA group feature before forcing the active system to standby

Using the Configuration utility to disable the HA group feature:

Impact of procedure: This will cause a failover event and the active device to become standby, no longer passing traffic.

Using the Configuration utility to disable the HA group feature:

  1. Navigate to System > High Availability > HA Group List.
  2. Select the HA group by name.
  3. Clear the Enable box.
  4. Select Update.
  5. Navigate to Device Management > Traffic Groups.
  6. Select the traffic group by name.

    traffic-group-1 is the default traffic group.

  7. Select Force to Standby.

Using the tmsh to disable the HA group feature:

  1. Log in to the Traffic Management Shell (tmsh) by typing the following command:

    tmsh

  2. To disable the HA group, type the following command syntax:

    modify /sys ha-group [name] disabled

    For example, to disable an HA group name ha_failover_example, type the following command:

    modify /sys ha-group ha_failover_example disabled

  3. To force the system into Standby state, type the following command:

    run /sys failover standby

Taking a system offline

Impact of procedure: When the BIG-IP system is in the offline state, the TMM interfaces no longer send and receive traffic. This can impact HA features such as connection mirroring.

Using the Configuration utility to take a system offline

  1. Log in to the BIG-IP Configuration utility of the system you want to take offline.
  2. Navigate to Device Management > Devices.
  3. Select the system for which you are logged in.
  4. Click Force Offline.
  5. Click OK.

Using the tmsh to take a system offline

  1. Log in to the tmsh utility by typing the following command:

    tmsh

  2. To take a system offline, type the following command:

    run sys failover offline

  3. To bring a system online, type the following command:

    run sys failover online

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