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Connecting external options
Before you begin:
Read the documentation that comes with your options.
Connecting external SCSI devices
Your server comes with one external SCSI port so that you can connect external
SCSI devices.
You can also attach a SCSI storage expansion enclosure to your server.
Cabling requirements
If you plan to install external SCSI devices, you must order additional SCSI cables.
These cables must have the proper connectors for the SCSI external connector and
the external devices. To select and order the correct cables for use with external
devices, contact your IBM reseller or IBM marketing representative.
Refer to the information that comes with your adapter to determine the number of
internal and external connectors, channels, and SCSI devices that the adapter
supports.
For information about the maximum length of SCSI cable between the terminated
ends of the cable, see the following ANSI SCSI Standards:
X3.131-1986 (SCSI)
X3.131-1994 (SCSI-2)
X3T10/1071D
X3T10/1142D (Ultra-2 SCSI)
X3.302:1998 (Ultra-2 SCSI)
Adhering to these standards ensures that your server operates properly.
Setting SCSI IDs for external devices
Each SCSI 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. See “SCSI
IDs” on page 80 and to the instructions that come with the SCSI devices for more
information about setting a SCSI ID.
Installing external devices
To attach an external device:
1. Read “Safety information” on page 39 through “Handling static-sensitive
devices” on page 43.
2. Run the shutdown procedure for the operating system. Turn off the server and
all attached devices.
3. Follow the instructions that come with the option to prepare it for installation
and to connect it to the server.
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