Manage application CRG takeover IP addresses
using cluster resource services. You can also manage them manually.
There are two ways to have the application takeover IP address associated with an application CRG managed. The easiest way, which is the default, is to let cluster resource services manage the takeover IP address. This method will direct cluster resource services to create the takeover IP address on all nodes in the recovery domain, including nodes subsequently added to the recovery domain. When this method is selected, the takeover IP address cannot currently be defined on any node in the recovery domain.
The alternative way is to manage the takeover IP addresses yourself. This method directs cluster resource services to not take any steps to configure the takeover IP address; the user is responsible for configuration. You must add the takeover IP address on all nodes in the recovery domain (except on replicate nodes) before starting the cluster resource group. Any node to be added to the recovery domain of an active CRG must have the takeover IP address configured before being added.
- Multiple subnets
- It is possible to have the application takeover IP address work across multiple subnets, although the default is to have all recovery domain nodes on the same subnet. See Enabling application switchover for the steps to configure the application takeover IP address when the nodes in the recovery domain span subnets.