Chapter 2: Installing the Chassis
QXS, QXS-3, and QXS-4 Series Drive Chassis Reverse Cabling Illustrations
QX and QXS Setup Guide
77
Figure 76:
Reverse Cabling Connections Between a RAID Chassis with Dual Controller I/O Modules and 3 Expansion
Chassis
Controller B
Controller A
RAID
Chassis 0
Expansion
Chassis 1
Expansion
Chassis 2
Expansion
Chassis 3
0A
0B
1A
1B
2A
2B
3A
3B
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
Example: Dual-controller RAID Chassis with 7 Expansion Chassis
Cable the RAID Chassis to the Expansion Chassis as shown in the following image.
l
Use the reverse cabling method shown in the following image to ensure the highest level of fault
tolerance.
This cabling method enables the RAID Chassis to maintain access to other Expansion Chassis if any
Expansion Chassis fails or is removed.
l
Note the following:
o
Controller I/O Module 0A is connected to expansion module 1A, with a chain of connections cascading
down (blue).
o
Controller I/O Module 0B is connected to the lowest expansion module of the last drive chassis, with
connections returning to the RAID chassis, in the opposite direction (green).
o
Consult with Quantum technical support when mixing and matching the QXS-3 and QXS-4 Series
expansion chassis.
