Hello,  A member can't be in two pools at the same time.   Once a RAID level has been set, when you add disks, they are added to the existing RAIDset at the same level.    Sorry, but you can't covert from a larger capacity RAID level to a smaller one.  R50 -> R5 yes, but not R5->R50.  You will either have to back up data, reset and restore, or get a loaner array, add it to the group, remove the original array, then add it back in at R50.  The remove the loaner.   This can be done live w/o any data loss or downtime.   Regards,  Don 
hi there, We currently have a single PS4000 with 8 disks in a RAID-5.  We plan to add another 8 disks and convert the SAN to RAID-50.. Are we able to add the extra 8 disks and create a new storage pool with RAID-50? We can then migrate the existing VMs across to the new pool. Once all across we plan to blow away the RAID5 array and add the disks to the RAID-50. Is this possible? Cheers, H 
migration from RAID5 to 50