Configuring Replication Resource Groups

Replication resource groups collocate the device group under Sun StorEdge Availability Suite 3.1 software control with the logical hostname resource. A replication resource group must have the following characteristics:

• Be a failover resource group

  A failover resource can run on only one node at a time. When a failover occurs, failover resources take part in the failover.

• Have a logical hostname resource

  The logical hostname must be hosted by the primary cluster. After a failover or switchover, the logical hostname must be hosted by the secondary cluster. The Domain Name System (DNS) is used to associate the logical hostname with a cluster.

• Have an HAStoragePlus resource

  The HAStoragePlus resource enforces the switchover of the device group when the replication resource group is switched over or failed over. Sun Cluster software also enforces the switchover of the replication resource group when the device group is switched over. In this way, the replication resource group and the device group are always collocated, or mastered by the same node.

  The following extension properties must be defined in the HAStoragePlus resource:

  • GlobalDevicePaths. This extension property defines the device group to which a volume belongs.

  • AffinityOn property = True. This extension property causes the device group to switch over or fail over when the replication resource group switches over or fails over. This feature is called an affinity switchover.

  For more information about HAStoragePlus, see the SUNW.HAStoragePlus(5) man page.

• Be named after the device group with which it is collocated, followed by -stor-rg

  For example, devicegroup-stor-rg.

• Be online on both the primary cluster and the secondary cluster