HP D7171A - NetServer - LPr Installation Manual page 29

Note: If you are attaching internal SCSI devices to a 68-pin
internal ribbon cable that has a built-in terminator, you must
remove the terminators from all devices attached to the
cable.
On most internal SCSI devices, the termination setting is controlled
by a jumper or a switch, or by physically removing or installing one
or more resistor modules. On most external SCSI devices,
termination is controlled by installing or removing a terminating
plug (see Figure 2-7 and Figure 2-8 on page 2-11). Read the device's
documentation to determine how to enable or disable termination
on your particular SCSI device.
Termination power should be enabled on all SCSI devices in or
attached to the server so that, if you remove a device that is
supplying termination power, termination power on the channel is
available from the other devices. Termination power is also
automatically supplied to the four channels on the HP NetRAID-4M
controller and cannot be disabled.
Termination on SCSI devices can be enabled or disabled
independent of from where the source of termination power is
provided. If the HP NetRAID-4M is powered off, the terminator
jumpers determine if its terminators are on or off — if no jumper is
installed, the termination is off. If the HP NetRAID-4M is powered
on, termination is set according to the device controller's BIOS
setting. However, if the device jumper is on, termination is on
regardless of the BIOS setting. The jumpers are shipped installed.
Note:
If the HP NetRAID-4M controller is installed within a
clustering environment, the terminator jumper must be
installed on all shared channels. To identify the termination
jumpers, see Figure 2-11.
Installing the Hardware
2-15