Seagate ST12550WD Betriebsanweisung PDF herunterladen (Seite 11)

KZPSA PCI-to-SCSI Storage Adapter

1–2 EK–KZPSA–UG. B01

The adapter’s processor minimizes the SCSI I/O overhead of the host computer’s

processor by interpreting host commands and translating them into specific de-

vice commands. This includes support for direct data transfer to host memory,

coding device-specific commands into specific command scripts, and supporting

internal command queues with disconnect/reconnect functionality.

The KZPSA is capable of 32-bit bus master data transfers, including PCI en-

hanced data transfer commands. The host adapter supports most SCSI-2 func-

tions.

The host adapter supports multithreaded I/O operations, thereby allowing simul-

taneous operations on multiple SCSI targets or Logical Units (LUNs). In systems

with multiple targets, the Disconnect/Reconnect feature optimizes SCSI bus us-

age. In systems that have fragmented memory buffers, the Scatter/Gather feature

provides high performance.

In addition to its normal role of SCSI initiator, the KZPSA provides support for

target mode operations. In this mode, the KZPSA can receive incoming SCSI-2

processor commands intended for its locally connected host. This functionality

makes the KZPSA, with operating system support, an integral component in ad-

vanced-system configurations such as the high availability DECsafe Available

Server Environment.

The KZPSA has several parameters the user can change to optimize the adapter’s

functionality within the system. These parameters may be changed using the

configuration utility software included with the module. This utility provides the

capability of changing settings on the boards NVRAM without having to make

physical changes to the host adapter board.

Some of the major features of the KZPSA are:

• Compliance with Intel PCI version 2.0, ANSI X3t9.2 SCSI-2 Standard, and

U.S. and international safety/emissions standards

• Fast-Narrow SCSI (8-bit, 10 Mbytes per second, 7 devices)

• Fast-Wide SCSI (16-bit, 20 Mbytes per second, 15 devices)

• On-board NVRAM that can be customized using a configuration utility – no

need to remove the computer cover to change configuration

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Seagate ST12550WD Betriebsanweisung Seite 11