Breaking Mirrored rootdisk & rootmirror for safe upgrade and rollback

Please see the thread I have going here:
https://forums.symantec.com/syment/board/message?board.id=86&thread.id=2489

Looking for feedback from people who have done this, and maybe have it documented.

Elegant Method to upgrade by breaking Mirrored rootdisk & rootmirror needed.

 
Need to upgrade and want to elegantly break the mirrored rootdisk & rootmirror before upgrade.

 
Does anyone have a method to do this that has worked? I want to break the mirror so I can boot off rootmirror and then mirror rootmirror -> rootdisk.

 

Thanks!

Craig