- IBM switch Users and Maintenance Guide

RAID controller
Each RAID controller contains several connectors and LEDs. Each
controller has two host ports and one expansion port for connecting the
storage server to hosts or expansion units. You first insert SFPs into the
ports and then connect the fibre channel cables.
Host ports
The host ports (labelled Host 1 and Host 2) are used to connect a fibre
channel cable from the host systems. You first insert an SFP into the port
and then connect a fibre channel cable. The two host ports in each
controller are independent. They are not connected in the controller module
as they would be in a hub configuration. The host port connections can
auto-negotiate between 1 Gbps and 2 Gbps.
Ethernet port
The Ethernet port is used for an RJ-45 10BASE-T or 100BASE-T Ethernet
connection to each controller. Use the Ethernet connection to directly
manage the DS4100.
Expansion port
The expansion port (labelled Expansion) is used to connect additional
expansion units to the RAID controllers on the DS4100 base storage server.
You first insert an SFP into the port and then connect a fibre channel cable.
Note: In the DS4100 single-controller storage server, the expansion port on
the RAID controller is not active.
Serial
port
The serial port is used by service personnel to perform diagnostic
operations on the RAID controllers. Incorrect use of the serial port can
result in loss of data access and, in some cases, in loss of data.
Note:
The maximum baud rate is 57 600 bps.
Server
ID switch (enclosure ID switch)
The server ID (also referred to as enclosure ID) switch settings range from
0 through 7. When connecting the DS4100 base storage server to DS4000
EXP100 storage expansion units, only the unique IDs ranging from 00
through 07 can be set.
Host port 1
Host port 2
Ethernet
Expansion port (inactive in the DS4100
single-controller storage server)
AC power
connector
AC power
switch
Serial port
Server ID
switch
1 Gbps/
2 Gbps
switch
f10ug022scu
Figure 7. Interface ports and switches for DS4100 single-controller storage server
12 IBM TotalStorage DS4100 Storage Server: Installation, User’s, and Maintenance Guide