Ultra160 Scsi Ports; Scsi Cabling Requirements; Setting Scsi Ids - IBM 6000R - Netfinity - 8682 Hardware Maintenance Manual

Table 16. Auxiliary-device connector pin-number
assignments
Pin
1 Data
2 Not connected
3 Ground
4 +5 V dc
5 Clock
6 Not connected

Ultra160 SCSI ports

The server has an integrated dual-channel Ultra160 small
computer system interface (SCSI) controller. This controller
supports two independent Ultra 160/m SCSI channels: one
internal and one external. Each of these channels supports
up to 15 SCSI devices. In addition, this controller uses:
• Double-transition clocking to achieve high transfer
rates
• Domain name validation to negotiate compatible data
transfer speeds with each device
• Cyclic-redundancy checking (CRC), instead of the
usual parity checking, to significantly improve data reli-
ability
• An active terminator on the system board for SCSI bus
termination
The server comes with two SCSI cables. One cable con-
nects the internal SCSI channel connector to the standard
hot-swap-drive backplane. The other cable is not connected
to the server when the server is shipped and must be
installed in the server. If you want to use the external LVD
SCSI channel connector to connect external SCSI devices
to the server, remove the knockout on the rear of the server
and install the LVD SCSI cable that comes with the server.
Note: If you install a PCI RAID adapter to configure and
manage the internal hot-swap drives, you must move
the SCSI cable from the system-board SCSI connec-
tor to an internal channel connector on the RAID
adapter. See "Cabling example for the ServeRAID
adapter" on page 71 for additional information.

SCSI cabling requirements

If you plan to attach external SCSI devices, you must order
additional SCSI cables. 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, refer to the ANSI
SCSI standards. Adhering to these standards will help
ensure that the server operates properly.

Setting SCSI IDs

Each SCSI device connected to a SCSI controller must have
a unique SCSI ID. This ID enables the SCSI controller to
identify the device and ensure that different devices on the
Signal
Installing options
97