Before you begin the migration to the new input/output adapter (IOA), as with any configuration change, it is important to do a normal system turn off. 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 the V5R2 release is migrated to an IOA that was released after the V5R2 release, your disk units are not protected by device parity protection while parity is being regenerated.
You cannot migrate a parity set back to the old generation of adapters after you have made the change to a new adapter. You cannot migrated a parity set back to the old generation of adapters and keep the data in tact. 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 you must stop and restart the device parity protection.