Compaq TruCluster Server AA-RHGWB-TE, Manual

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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