IBM DCS3860, Installation, User'S, And Maintenance Manual

Page: 27 / 204

Controllers
The DCS3860 storage system (1813-86C) has two redundant controllers, which can
be hot-swapped. The controllers contain the storage system control logic, interface
ports, and LEDs. The controllers install from the rear of the storage enclosure.
Controller A is installed in storage bridge bay slot A (SBB A) and controller B is
installed in storage bridge bay slot B (SBB B). All connections to the hosts and the
expansion enclosures are made through the controllers. Figure 4 shows the location
of the controllers in the DCS3860.
Note: To preserve optimal airflow, do not remove a failed controller FRU from the
DCS3860 chassis until you are ready to replace it with a new FRU.
Information about the condition of the controllers is conveyed by indicator LEDs
on the controller. See “Controller LEDs” on page 62 for more information about the
LEDs found on the RAID controller.
Controller cable connections
The SAS ports, Ethernet ports, and the optional HIC on a DCS3860 system are
depicted with a diagram. Each controller contains the following connections:
v Two 6 Gbps x4 SAS expansion ports to connect EXP3800 expansion enclosures
v
Two RJ-45 Ethernet ports for system management
v
Support for one optional host interface card (HIC)
Attention:
The DCS3860 storage system controllers must be identical to each
other in hardware (host port adapter and cache size) and firmware. If you install a
host port adapter in one controller, you must install an identical host port adapter
in the other controller.
Expansion ports
Each controller has two 6 Gbps x4 SAS expansion ports to connect expansion
enclosures to the storage system. The four SAS expansion ports (two on each
controller) are used to form a redundant drive channel.
Ethernet management ports
The Ethernet connections provide for out-of-band management of the controller.
Each controller has two RJ-45 Ethernet ports that support either 100Base-T or
1000Base-T connections.
AC DC
2
1
I
O
AC DC
2
1
I
O
Controller or ESM
SBB A
Controller or ESM
SBB B
dcsi0030
Figure 4. Location of the DCS3860 controllers
Chapter 1. Introduction
9