Suspending an appliance from an HA group for maintenance
When you want to suspend an appliance from a high availability group, for example, to carry out maintenance on the appliance, you perform a managed failover. This procedure transfers all the workload to the remaining appliance in the group.
To achieve the managed failover, you put the appliance that you want to temporarily remove from the group into standby mode. You then resume the appliance after the maintenance is complete.
Note: While you have one appliance in standby mode, your queue managers can run only on the
remaining appliance. You should take care to avoid any outage on the second appliance. If your appliance is part of a configuration that has disaster recovery to
another HA pair at a remote site, consider failing over to the remote site.
You use this technique when you update the firmware on the appliances in your high availability
group, for example to apply a fix pack. In this situation, you suspend the first appliance, update
the firmware, and then resume it. You can then suspend the other appliance, upgrade the firmware,
and then resume it.
Note: When you use this technique to update firmware, the HA queue managers
running on the first appliance that you updated restart when you resume the HA group on the second
appliance.