Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Instrukcja Obsługi Pobierz pdf (Strona 346)

Example 9–5: Displaying the pk* Console Environment Variables on an

AlphaServer 4100 System (cont.)

pkf0_fast 1

pkf0_host_id 7

pkf0_termpwr 1

Compare the show pk* command display in Example 9–5 with the

show config command in Example 9–1 and the show dev command

in Example 9–2. Note that there are no pk* devices in either display.

Example 9–2 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 9–5 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 9–6 shows the use of the show isp console command to display

the console environment variables for KZPBA-CBs on an AlphaServer 8x00.

9–14 Configuring Systems for External Termination or Radial Connections

to Non-UltraSCSI Devices

1 2 ... 341 342 343 344 345 346 347 348 349 350 351 ... 421 422

Brak uwag

Compaq StorageWorks TM RAID Array 3000 Pedestal Storage Subsystem Instrukcja Obsługi Strona 346