The subsystem must be switched off to change RAID level.
To change RAID level:
1.
Power off
2.
Set the new RAID level using the RAID level selector
3.
Remove all four disks
4.
Power on
5.
Install the four disks to start RAID initialization
Changing RAID level may lead to the loss of all data on the array.
-4-3-
Chapter 4 – Setting up an array