HP NetRAID-4M Configuration and Upgrade Guide (Release 5)

The design of the HP NetRAID-4M requires the manual override of automatic SCSI

termination for the cluster environment. This guarantees that the controller will still

be able to terminate the SCSI bus even if the controller is powered off. Manual

override requires:

• removing the card,

• possibly inserting a jumper, and

• reinstalling the card.

Controller Position and Termination

Two SCSI standards require that:

• An active host bus adapter must drive the termination power.

• SCSI termination must be provided at the ends of the bus and nowhere else.

The NetRAID-4M card is shipped with a jumper in place. It should be there for all

shared channels. Based on the card's position on the SCSI bus, do the following:

1. If the card is in the middle of the SCSI bus, remove the jumper.

2. If the card is at the end of the SCSI bus and not part of a cluster, the jumper may

be removed or may remain in place. Termination power is automatically

supplied to the four channels on the HP NetRAID-4M controller and cannot be

disabled.

3. If the card is at the end of the SCSI bus and part of a cluster, the jumper must be

in place.

2 SCSI Devices and Clustering

NOTE Verify that the initiator's SCSI ID for each shared channel on

each controller is a unique number. Also, verify that the

initiator's SCSI IDs for each channel are unique from the IDs

assigned to the storage enclosures. The Rack Storage/12

reserves SCSI ID 5 for the enclosure and SCSI IDs 0-3 and 8-

15 for mass storage devices.