Setting Up Scsi Devices; Choosing Scsi Cables - HP D5970A - NetServer - LCII Installation And Configuration Manual

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.
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