HP-UX 11i v1 Installation and Update Guide, September 2005

Known Problems and Troubleshooting
SCSI PCI HBA Documentation Correction
Appendix B 165
SCSI PCI HBA Documentation Correction
An error exists in the current manual for each of following SCSI PCI
Host Bus Adapters (HBAs): A4800A, A5149A, A5150A, and A5159A
The content for the “Setting the SCSI IDs” section of the “Installing the
Adapter” chapter is not correct. The correct content for the “Setting the
SCSI IDs” section is as follows:
You must assign the SCSI host bus adapter and each SCSI device a
separate SCSI ID (0 through 15 for a 16-bit SCSI bus). The device's
priority on the SCSI bus is determined by the device's SCSI ID. The
order of SCSI ID priorities (from highest to lowest) is 7, 6, 5, 4, 3, 2,
1, 0, 15, 14, 13, 12, 11, 10, 9, and 8. A device with SCSI ID 7 has
the highest priority, and one with SCSI ID 8 has the lowest.
When you are assigning SCSI IDs, we recommend you give the
SCSI host bus adapter higher priority than the other SCSI devices
on the bus. SCSI ID 7 is the preset SCSI ID for your HP SCSI host
bus adapter (giving it the highest priority on the SCSI bus). Set
each of the other SCSI devices on the bus to one of the remaining
SCSI ID's.
For a multi-initiator (High Availability [HA]) configuration-where
multiple SCSI host bus adapters are connected to the same SCSI
bus-the SCSI host bus adapter that carries the most traffic should
be assigned a SCSI ID of 7 (giving it the highest priority), then you
must change the SCSI ID of each of the remaining SCSI host bus
adapter's on the bus from the preset setting (7), to the next highest
priority remaining SCSI IDs (e.g. 6, 5, 4... and so on).
If you plan to boot your system from a hard disk drive on the SCSI
bus, you should assign that drive the next highest priority
unassigned SCSI ID. If there is only one SCSI host bus adapter
(SCSI ID = 7), the hard disk drive would be assigned a SCSI ID of
6. If there are multiple SCSI host bus adapters, the hard disk drive
would be assigned the next highest priority SCSI ID available after
all of the SCSI host bus adapters have been assigned higher
priority SCSI IDs.