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Example 10–5: Displaying the pk* Console Environment Variables on an
AlphaServer 4100 System (cont.)
pke0_termpwr 1
pkf0_fast 1
pkf0_host_id 7
pkf0_termpwr 1
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.
10–14 Configuring Systems for External Termination or Radial Connections
to Non-UltraSCSI Devices