Compex Systems Advanced SerialRAID Adapters SA33-3285-02 - Manual (Page 52)

RAID-1 Array States
RAID-1 array states are the same as RAID-10 array states. For details, see “RAID-10
Array States” on page 36.
In RAID-1 arrays, the first member disk drive of the array is defined as the primary disk
drive and the second member disk drive is defined as the secondary disk drive. These
definitions prevent operation on separate member disk drives of the array when the
array becomes split, but separate systems can still access one of the member disk
drives. RAID-10 defines the first and third disk drives to be primary member disk drives.
RAID-1 defines the first disk drive to be the equivalent of the first and third disk drives
together. If the first disk drive is missing in RAID-1, it is equivalent to the first and third
disk drives being missing in RAID-10.
32 User’s Guide and Maintenance Information