Compaq AA-RHGWC-TE manual Qlogic ISP1020 devices KZPBA-CBs as isp0 and isp1 with disks

Example 10–5: Displaying the pk* Console Environment Variables on an AlphaServer 4100 System (cont.)

pkf0_fast1

pkf0_host_id7

pkf0_termpwr1

Compare the show pk* command display in Example 10–5 with the show config command in Example 10–1 and the show dev command in Example 10–2. Note that there are no pk* devices in either display. Example 10–2 shows:

•The NCR 53C810 SCSI controllers as ncr0 and ncr1 with disk DKa and

DKb (pka and pkb)

•The Qlogic ISP1020 devices (KZPBA-CBs) as isp0 and isp1 with disks

DKc and DKd (pkc and pkd)

•The KZPSA-BBs with disks DKe and DKf (pke and pkf)

Example 10–5 shows two pk*0_soft_term environment variables; pkc0_soft_term which is on, and pkd0_soft_term which is diff.

The pk*0_soft_term environment variable applies to systems using the QLogic ISP1020 SCSI controller, which implements the 16-bit wide SCSI bus and uses dynamic termination.

The QLogic ISP1020 module has two terminators, one for the 8 low bits and one for the high 8 bits. There are five possible values for pk*0_soft_term:

•off — Turns off both the low 8 bits and high 8 bits

•low — Turns on the low 8 bits and turns off the high 8 bits

•high — Turns on the high 8 bits and turns off the low 8 bits

•on — Turns on both the low 8 bits and high 8 bits

•diff — Places the bus in differential mode

The KZPBA-CB is a Qlogic ISP1040 module, and its termination is determined by the presence or absence of internal termination resistor SIPs RM1-RM8. Therefore, the pkb0_soft_term environment variable has no meaning and it may be ignored.

Example 10–6 shows the use of the show isp console command to display the console environment variables for KZPBA-CBs on an AlphaServer 8x00.

10–14Configuring Systems for External Termination or Radial Connections to Non-UltraSCSI Devices