NEC Express5800 series User Manual page 99

The assignment messages in different RAID types are as follows:
– RAID-0: Two drives min. and four drives max.
– RAID-1: Two drives min. or two drives max. and one spare drive
IMPORTANT:
Up to two hard disk drives can be connected per CPU blade. Spare
drives cannot be set.
To start the system from the created array, be sure to create a
bootable array. See "Setting Bootable Array System" described later.
Configuring Your Server 4-33