Seagate ST12550WD Betriebsanweisung PDF herunterladen (Seite 15)

KZPSA PCI-to-SCSI Storage Adapter

2–2 EK–KZPSA–UG. B01

These defaults were chosen for optimum performance of the adapter. If they are

acceptable for your configuration, proceed to Installation in Chapter 3. Each of

these attributes, except for termination present, can be changed by using the

configuration utility described in Chapter 6.

2.2 PCI Bus Configuration

PCI Adapters are automatically configured by the power-up software. The

adapter addresses and interrupts are set without jumpers.

2.3 SCSI Bus Configuration

The KZPSA allows direct connection of both 8-bit (narrow) and 16-bit (wide)

differential SCSI bus devices. You can connect up to 15 devices to your adapter.

The total bus length should not exceed 25 meters for a differential SCSI bus.

For the KZPSA to support single-ended devices, you must use a differential-to-

single-ended SCSI bus converter such as the Digital DWZZA bus converter.

With a DWZZA bus converter (16-bit differential to 8-bit single-ended), you can

connect up to 7 single-ended SCSI bus devices in addition to 8 wide differential

SCSI bus devices to the KZPSA adapter. With a DWZZB bus converter (16-bit

differential to 16-bit single-ended), you may connect up to 15 single-ended de-

vices. The total bus length should not exceed 3 meters for a fast single-ended bus

or 6 meters for a slow single-ended bus.

The SCSI ID for the KZPSA adapter is defaulted to 7. If multiple adapters (see

your host system manual for possibilities) are used on the same SCSI bus, the

recommended SCSI IDs of the adapters should be 7, 6, 5, etc. Specific applica-

tions, such as Available Server Environment in Appendix B, may make alterna-

tive recommendations.

Only one device can use the SCSI bus at a time. When two or more devices try to

use the bus at the same time, the priority arbitration scheme determines which

device goes first and which devices must wait. The SCSI ID priority from highest

to lowest is as follows: SCSI ID 7-6-5-4-3-2-1-0-15-14-13-12-11-10-9-8.

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Seagate ST12550WD Betriebsanweisung Seite 15