Chapter 1: Components
4U56 Drive System
QX and QXS Setup Guide
23
4U56 RAID Chassis: Rear Panel Layout
The diagram and table below display and identify important component items that comprise the rear panel
layout of a 4U56 RAID chassis. The following image (Figure 31 below) shows a representative example of
RAID chassis models included in the product series.
Note:
The 4U56 Series RAID chassis (4U) is considerably different from the 2U12, 2U24, and 2U48
RAID chassis (2U) systems.
Figure 31:
4U56 RAID Chassis: Rear Panel Layout
LINK
SERVICE–1
CACHE
DIRTY
CLEAN
LINK
ACT
SERVICE–2
CLI
CLI
PORT 0
PORT 1
PORT 2
PORT 3
LINK
SERVICE–1
CACHE
DIRTY
CLEAN
LINK
ACT
SERVICE–2
CLI
CLI
PORT 0
PORT 1
PORT 2
PORT 3
3
4
5
5
3
4
1
2
1.
Controller I/O Module A
2.
Controller I/O Module B
3.
AC Power Switch (qty. 2)
4.
AC Power Supply (PSU, qty. 2)
5.
Fan Control Module (FCM, qty. 2)
The RAID chassis accommodates two Controller I/O modules within the chassis (see callouts No.1 and
No.2 above). A RAID chassis accommodates two power supply units of the same type — either both AC or
both DC — within the two power supply slots (see two instances of callout No.4 above). Beneath each
power supply is a power supply switch (see two instances of callout No.3 above). The RAID chassis
accommodates two fan control modules (see two instances of callout No.5 above).
Caution:
The QXS storage configurations are dual-controller. Single-controller support is provided
only when a controller fails over to its partner controller. A controller I/O module must be installed in
each slot to ensure sufficient airflow through the chassis during operation.
Note:
The chassis support hot-plug replacement of redundant controller I/O modules, fans, power
supplies, and expansion modules. Hot-add replacement of expansion chassis is also supported.
