HP NetServer LP 2000r HP Netserver Ultra3 SCSI HBA Guide - Page 11

Setting Up SCSI Devices, Choosing SCSI Cables

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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. 5

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5
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
)
See Table 1-1 that follows to determine the correct cable for your HP Netserver
and SCSI configuration.