IBM 847671U 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