81 Chapter 7
7.1.2 Operating System Swap
When the primary operating system is damaged and can't start, the hidden
backup operating system (Array 3) can be used to start the system. The
RAID BIOS must be used to swap to the hidden backup OS.
1. Restart the unit and press <Ctrl-R> to enter the RAID BIOS.
2. In the upper left corner you can see the complete list of arrays (as
shown below). Array 3 has just undergone a mirror split. The blue
indicates that it is a hidden array. As only one array (Number 1) can
be used to turn on the system, we have to swap the backup system
array to the first, so it can be used to turn on the system.