IBM 86594RY Hardware Maintenance Manual - Page 75

Preinstallation steps all bays, Termination requirements

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If you install wide (16-bit) SCSI devices, you can set the IDs to any whole number between 0 and 6, or to any whole number between 8 and 13, or to 15. If you install narrow (8-bit) SCSI devices, you can set the IDs to any whole number between 0 and 6. The server automatically sets SCSI IDs for hot-swap hard disk drives, according to the jumper settings on the DASD backplane. The server uses the hard disk drive SCSI IDs to send status information to the indicator lights on each hard disk drive. See "Front panel indicators" on page 85 for the location and identification of the hard disk drive status lights. Table 2 shows the default SCSI IDs that the backplane assigns for hot-swap hard disk drives. Table 2. Automatically Assigned SCSI IDs Bay 1 2 3 4 5 ID 0 1 2 3 4 You can change the default ID addresses of the drives by changing the jumper settings on the DASD backplane. See "SCSI jumpers" on page 137. Termination requirements: The UltraSCSI controller and the backplane of the hot-swap bays provide termination for the internal SCSI bus (cable) in the server. There are no termination requirements for any SCSI devices you install in the hard disk drive bays or attach to this cable. If you attach a SCSI cable and devices to the external SCSI connector, set the termination for the last device on that SCSI cable to Enabled. Refer to the instructions that come with the SCSI device for more information about termination. Preinstallation steps (all bays) Before you begin, be sure you have: Read "Safety information" on page 176. Read the documentation that comes with the option. Read "Termination requirements." Verified that you have all cables, drive trays, and any other equipment specified in the documentation that comes with the internal drive. Before you can install drives in the Netfinity 5000, you might need to perform certain preinstallation activities. Some of the steps are required only during the initial installation of an option. Netfinity 5000 - Type 8659 67

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If you install wide (16-bit) SCSI devices, you can set the
IDs to any whole number between 0 and 6, or to any
whole number between 8 and 13, or to 15.
If you install
narrow (8-bit) SCSI devices, you can set the IDs to any
whole number between 0 and 6.
The server automatically sets SCSI IDs for hot-swap hard
disk drives, according to the jumper settings on the DASD
backplane.
The server uses the hard disk drive SCSI IDs
to send status information to the indicator lights on each
hard disk drive.
See “Front panel indicators” on page
85
for the location and identification of the hard disk drive
status lights.
Table
2 shows the default SCSI IDs that the backplane
assigns for hot-swap hard disk drives.
You can change the default ID addresses of the drives by
changing the jumper settings on the DASD backplane.
See “SCSI jumpers” on page
137.
Termination requirements:
The UltraSCSI controller
and the backplane of the hot-swap bays provide
termination for the internal SCSI bus (cable) in the server.
There are no termination requirements for any SCSI
devices you install in the hard disk drive bays or attach to
this cable.
If you attach a SCSI cable and devices to the external
SCSI connector, set the termination for the last device on
that SCSI cable to Enabled.
Refer to the instructions that
come with the SCSI device for more information about
termination.
Preinstallation steps (all bays)
Before you begin, be sure you have:
±
Read “Safety information” on page
176.
±
Read the documentation that comes with the
option.
±
Read “Termination requirements.”
±
Verified that you have all cables, drive trays, and
any other equipment specified in the
documentation that comes with the internal drive.
Before you can install drives in the Netfinity 5000, you
might need to perform certain preinstallation activities.
Some of the steps are required only during the initial
installation of an option.
Table 2. Automatically Assigned SCSI IDs
Bay
1
2
3
4
5
ID
0
1
2
3
4
Netfinity 5000 - Type 8659
67