Connecting External Options; Connecting External Scsi Devices; Cabling Requirements; Setting Scsi Ids For External Devices - IBM xSeries 240 81Y Hardware Maintenance Manual

Connecting external options

Before you begin:
Read "Safety information" on page 224.
Read the documentation that comes with the
options.

Connecting external SCSI devices:

attach a SCSI storage expansion enclosure to the server.

Cabling requirements:

The SCSI controller in the
server has one channel that can be used to attach external
devices. This channel is connected to the SCSI connector
on the back of the server and supports 14 unique SCSI
IDs. To select and order the correct cables for use with
external devices, contact your IBM reseller or IBM
marketing representative.
For information about the maximum length of SCSI cable
between the terminated ends of the cable, see ANSI SCSI
Standards:
X3.131-1986 (SCSI)
X3.131-1994 (SCSI-2)
X3T10/1071D
Adhering to these standards ensures that the server
operates properly.

Setting SCSI IDs for external devices:

device that is connected to a SCSI controller must have a
unique SCSI ID, so that the SCSI controller can identify
the devices and ensure that different devices do not
attempt to transfer data at the same time. SCSI devices
that are connected to different SCSI controllers can have
duplicate SCSI IDs. The SCSI controller uses one of the
SCSI IDs; the default SCSI ID for the SCSI controller is 7.
See "SCSI IDs" on page 123 and refer to the instructions
that come with the SCSI devices for more information
about setting a SCSI ID.

Installation procedure:

To attach an external
device:
1. Turn off the server and all attached devices.
2. Follow the instructions that come with the option to
prepare it for installation and to connect it to the
server.

Input/output ports and connectors:

input/output (I/O) connectors are for attaching external
devices, such as printers, keyboards, and displays, to the
server. The I/O connectors on the server include:
Two serial-port connectors
One management port C connector
One parallel-port connector
One video-port connector
142
xSeries 240 HMM
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Each SCSI
The