NEC MC2400 - Manual (Page 148)

A-6 System Cabling
RAID Configuration
The RAID options available for your system are the Mylex AcceleRAID ™ 150 and the
Mylex AcceleRAID 250 Controller boards, which gives your system the added security
of fault tolerance.
If you order a system with a RAID controller, the system is pre-cabled at the factory
(see "RAID System Cabling Configuration" figures below.)
If you are adding either the AcceleRAID ™ 150 or the AcceleRAID 250 Controller you
must install, cable, and configure the controller. Refer to "Installing a RAID Controller
Board" in Chapter 4.
Note: Next Boot Status for the first Symbios SYM53C875
controller must be turned OFF if you install the optional Mylex
AcceleRAID
™ 150 or Mylex AcceleRAID 250 Controller board in your
system. Refer to “Symbios Configuration Utility” found in Chapter 3.
Note that Jumper JP10 (see figure below) that enables the SCSI Interrupt Steering
Logic (SISL) control on the RAID controller must be in its off position (not jumpered),
which is its default position.
Note: The jumper is set correctly at the factory for your
system configuration. If your system requires a jumper change,
change only the jumper setting for that condition. Otherwise, keep
the jumper at its factory setting.