On the same OES2sp3 server I want to add a larger volume and move my GroupWise 2012 post office and domain onto it. I am not moving to a new server at this point.

If I understand the process correctly, these are the steps.

0.) Down server and add new storage volume - format in native EXT3 format(Documentation lists this as preferred on Linux. Is this still true?)
1.) Make a full backup.
2.) Change the properties on the Post Office and Domains UNC path to be what will be their new mount point.
3.) Log in as root
4.) Down all GroupWise daemons.
5.) cp -rp /origlocation /newlocation
6.) Bring up all the GroupWise daemons

Did I miss a major step? Any clarification is appreciated. Thank you.