CRG Failover HyperSwap and LUN switching
In the case of a planned outage of the system server, a CRG failover can be initiated.
The following conditions must be met before the failover is initiated.
- Both DS8000s must be accessible by PowerHA® through DSCLI.
- None of the HyperSwap® relationships in the IASP can have two primary volumes. This is shown by XXXX for the copy status when a Display HyperSwap Status or Work with HyperSwap Status command is run for the IASP.
In the figure, first the CRG failover takes place, resulting in , where IASP1 is now varied on to IBM i B. If affinity was defined by the ADDHACFGD command and the affinity is not correct after the CRG failover, then PowerHA will also initiate a HyperSwap switchover of IASP1, shown in .
If a HyperSwap switchover cannot be completed due to some reason such as HyperSwap being suspended or not fully synchronized, the CRG failover completes and a diagnostic message is sent indicating that the HyperSwap switchover failed.