How-to exchange filers' disks and aggrs

[jqLi]

Hi,

We have 2 Fas8020 Running 7-Mode OnTap 8.2.3P3 in HA pair, their aggrs are all SyncMirrored. We'd like to exchange their disks ownership to make A controller works as B controller. And the same to B. How could we do?

I have read some Introductions for replace one node using

disk reassign -s   <old_sysid> -d <new_sysid>

but I am afraid if I use 

disk reassign -s   <a_sysid> -d unowned

disk reassign -s   <b_sysid> -d <a_sysid>

disk reassign -s   unowned -d <b_sysid>

reboot

I think something error may happen during that.