HP Netserver Ultra3 SCSI HBA Guide

Setting Up SCSI Devices

There are several things you may need to do to your SCSI devices before you

connect them to the HP Ultra3 SCSI host bus adapter:

• Check the SCSI IDs

• Set the termination

• Connect the power cables.

Since setup can vary from device to device, always refer to the device’s

documentation for specific instructions.

Below are some guidelines for setting SCSI IDs and termination on your

devices.

Check the SCSI IDs

The HP Ultra3 SCSI host bus adapter and each device you connect to it must

have a unique SCSI ID number ranging from 0 to 15. No two devices can have

the same ID number. The HP Ultra3 SCSI host bus adapter is preset to SCSI ID

7 and should not be changed. If your HP Netserver will boot from a SCSI hard

disk, make sure the SCSI ID of that hard disk is set to 0. (Most SCSI hard disks

are preset to SCSI ID 0 at the factory.) The SCSI IDs for internal devices are

usually set with jumpers; SCSI IDs for external devices are usually set with a

switch on the back of the device.

Terminate the Ends

To ensure reliable communication on the SCSI bus, the device at the end of

each cable, or the end of the cable itself, must have a terminator installed (or

enabled). Terminators must be removed, or termination must be disabled, on

devices between the ends of each cable.

Choosing SCSI Cables

The Ultra3 SCSI Host Adapter kit does not include cables. Any Ultra3 drives

attached to HP Ultra3 host bus adapters inside a HP Netserver require the use of

a special Ultra3 twisted pair cable. The HP Ultra3 cable upgrade kit part

number is P3469A. These cables can be purchased from an authorized

Hewlett-Packard reseller, or on HP Order Assistant (available on the Internet at

http://netserver.hp.com/netserver/)

See Table 1-1 that follows to determine the correct cable for your HP Netserver

and SCSI configuration.