IOA migration
There are considerations and limitations when migrating an IOA.
Before you begin the migration to the new IOA, as with any configuration change, it is important to do a normal system power down. This will assure that all of your cache data is written to disk before the power down completes. When a parity set under an IOA that was released before V5R2 is migrated to an IOA that was released after V5R2, your disk units are not protected by device parity protection while parity is being regenerated.
You cannot migrate a parity set back to adapters released before V5R2 after you have made the change to a new adapter. You cannot migrate a parity set back to the old generation of adapters and keep the data intact. This action requires a save and restore of disk unit data to prevent data loss. To migrate RAID 5 protection to RAID 6 or RAID 6 protection to RAID 5, stop and restart the device parity protection.