IBM 847661U Hardware Maintenance Manual - Page 113

Preinstallation steps all bays, Termination requirements

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Certain types of physical SCSI devices (bridge controllers) can support more than one logical device. For example, a printer controller might support up to eight printers. The printer controller is a physical device, and each printer is a logical device. If the printer controller is assigned to ID 2, the ID of the first printer appears in the SCSI device configuration as PUN 2, LUN 0. The IDs of the other printers are PUN 2, LUN 1; PUN 2, LUN 2; on up to PUN 2, LUN 7. Termination requirements: The Netfinity 3000 server comes with an UltraSCSI adapter. The SCSI bus must be terminated at both ends only. The UltraSCSI adapter provides termination for one end of the SCSI bus (cable) in the server. The SCSI cable in the server comes with a terminator that provides termination for the other end of the SCSI bus. Therefore, any internal SCSI devices that are installed must have their termination set to Disabled. When you install devices in bays 2, 3, 5, and 6, you must disable the termination for the devices before you install them. If you connected external SCSI devices to the server, set the termination for the last device on the external cable to Enabled. See the device documentation for instructions. If you plan to install both 16-bit (wide) and 8-bit (narrow) SCSI devices: 1. Attach the 16-bit devices at the beginning of the SCSI chain. 2. Attach the 8-bit devices at the end of the SCSI chain. Note The beginning of the SCSI chain is the end closest to the SCSI adapter or the system board. This enables the UltraSCSI adapter to recognize all of the devices in the SCSI chain, and thus ensures proper server operation. 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 212. 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. IBM Netfinity 3000 - Type 8476 105

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Certain types of physical SCSI devices (
bridge controllers
)
can support more than one logical device.
For example, a printer controller might support up to eight
printers.
The printer controller is a physical device, and
each printer is a logical device.
If the printer controller is
assigned to ID 2, the ID of the first printer appears in the
SCSI device configuration as PUN 2, LUN 0.
The IDs of
the other printers are PUN 2, LUN 1; PUN 2, LUN 2; on up
to PUN 2, LUN 7.
Termination requirements:
The Netfinity 3000 server
comes with an UltraSCSI adapter.
The SCSI bus must be
terminated at both ends only.
The UltraSCSI adapter
provides termination for one end of the SCSI bus (cable) in
the server.
The SCSI cable in the server comes with a
terminator that provides termination for the other end of the
SCSI bus.
Therefore, any internal SCSI devices that are
installed must have their termination set to Disabled.
±
When you install devices in bays 2, 3, 5, and 6, you
must disable the termination for the devices before
you install them.
±
If you connected external SCSI devices to the server,
set the termination for the last device on the external
cable to Enabled.
See the device documentation for
instructions.
If you plan to install both 16-bit (wide) and 8-bit (narrow)
SCSI devices:
1.
Attach the 16-bit devices at the beginning of the SCSI
chain.
2.
Attach the 8-bit devices at the end of the SCSI chain.
Note
The beginning of the SCSI chain is the end closest to
the SCSI adapter or the system board.
This enables the UltraSCSI adapter to recognize all of the
devices in the SCSI chain, and thus ensures proper server
operation.
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
212.
±
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.
IBM Netfinity 3000 - Type 8476
105