When data replication is performed by switching independent auxiliary storage pools (ASPs), a single copy of the data exists. A device CRG identifies a collection of disks that can be varied on and off independently of the system ASP and basic ASPs (SYSBAS) in the event of a failover or switchover.
One scenario using switchable independent ASPs is to switch a disk pool between LPARs on the same physical system (Figure 3).
Figure 3.LPAR implementation of switchable disk pool
In environments which implement switchable independent ASPs, Assure MIMIX for PowerHA provides additional monitoring for and notification of conditions that may require action in order to prevent a prolonged switch.
Switchable independent ASP support combined with logical replication software from Precisely provides enhanced high availability and disaster recovery.