Configuring HP-UX For Peripherals

90 Chapter3
Configuring Interface Cards
Selecting Device Drivers for Your Interface Cards
SCSI Addressing
Up to seven single-ended SCSI or fifteen fast-wide SCSI devices can be
configured to a single SCSI deviceadapter. Each device requires a unique
bus address.
• For single-ended SCSI, addresses range from 7 to 0 with 7 (highest
priority) reserved for the adapter itself and 0 being the lowest
priority.
• For fast-wide SCSI, addresses range from 7 to 0 with 7 (highest
priority) reserved for the adapter itself and 14 to 8 (lowest priority).
Although most peripheral devices require only one address, the Optical
Disk Library System (HP C17 xx A) uses three SCSI addresses (two for
the magnet-optical drives and one for the auto changer picker).
SCSI Cabling
Multiple SCSI peripheral devices can be connected to a single SCSI
interface using a daisy-chain configuration. The final SCSI device in the
daisy chain requires the proper terminator, discussed later in "SCSI
Signal Termination."
NOTE The SCSI bus should be kept as short as possible. Total cable length for
Table 3-11 SCSI Configuration Requirements
Architecture Interface Card (SCSI Type) Interface Driver
Series 700 EISA 25525A/B (Differential)
sctl
a
Series 800 CIO 27147A (Single-Ended)
scsi2
b
Series 800 HP-PB 28655A (Single-Ended)
scsi1
c
Series 800 HP-PB 28696A (Fast/Wide)
scsi3
c
a. Specifying sctl causes c700, c720, wsio, core, eisa, and eeprom
to be included in the kernel.
b. Specifying scsi2 causes cio_ca0, sio, pfail, and pa to be
included in the kernel.
c. Specifying scsi1 or scsi3 causes sio, pfail, and pa to be included
in the kernel.