Replacing a failed Disk in a Raid Set

["Art Tostaine, Jr." <artjr@xxxxxxxxxxx>]

My Disk config looks like this on my V5R1 270:

                           Resource                    
ASP  Unit      Type Model  Name        Status          
  1                                             Unprotected     
        1      6713  074   DD004       DPY/Failed      
        2      6713  074   DD001       DPY/Unprotected 
        3      6713  074   DD005       DPY/Unprotected 
        4      6713  074   DD002       DPY/Unprotected 
        5      6713  070   DD003       DPY/Unprotected

Can I just power down, pop out disk 1, replace it, then power on?  Or is
there something I need to do in service tools?

I've been browsing the backup and recovery guide, but haven't found how
to yet.  I don't have hardware service on this development machine, so
I'm doing this myself.

Art Tostaine, Jr.
CCA, Inc.
Jackson, NJ 08527