Yes you can. Just right-click the raid group in question and hit properties. On the disk tab is an expand button. Adding drive/s will cause a restripe of the data.  If this was a different raid type, you would need to fall into the restrictions of those raid types. Raid 1/0 would only allow adding 2 drives at a time.  -Ryan
Hi. I have an unallocated shelf of identical drives in my old CX700.  If I create a RAID group on the first 10 drives (RAID 5 9+1), can I later expand the RAID group by adding the 11th drive and make it RAID5 10+1?  I want to avoid the whole metta-LUN thing.  I know I can expand it by migrating it to a different shelf but I thought it would be easier to just add a drive.  Thank you.
Can I add a drive to a RAID group?