HyperSwap planned switchover with HyperSwap and LUN switching

In the case of a planned outage of a storage server, a HyperSwap® switchover can be initiated, resulting in near-zero downtime from a user perspective. In the following figure on the left, all disk units in IASP1 are metro mirrored to the second DS8000® to create a HyperSwap relationship. In addition to being configured for HyperSwap, IASP1 is also configured for LUN level switching to a second IBM® i partition, named IBM i B in the figure.

For the HyperSwap switchover to be initiated, the following conditions must be met.

1. All disk units in the ASP group must be configured in a HyperSwap relationship.
2. All of the HyperSwap relationships in the ASP group must be fully synchronized.
3. All of the HyperSwap relationships in the ASP group must be going the same direction (some disk units in the ASP group cannot have one DS8000 as the primary while other disk units have the other DS8000 as primary).

When the user wants to initiate a planned HyperSwap switchover of IASP1, the following command must be entered:

CHGHYSSTS OPTION(*SWAP) NODE(*) ASPDEV(*ALL)

After you enter the command, the primary access for IASP1 and SYSBAS will be the second DS8000, as shown in the figure on the right side.