Acer SmartRAID V Bedienungsanleitung PDF herunterladen (Seite 190)

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Theory of Operation

SmartRAID V Architecture

SmartRAID V controllers can process commands from the operating

system using two different protocols:

• ASPI (Advanced SCSI Programming Interface), which is compatible

with tape and CD-ROM application software.

• I

O Messaging, which uses the full performance capability and

function of the PCI bus.

ASPI Protocol

SmartRAID V controllers can communicate with any ASPI protocol device

under Windows NT and Windows 95/98.

ASPI support under MS-DOS is limited to CD-ROM drives only. MS-DOS

support is provided by the I2ODDL.SYS and DPTCDROM.SYS driver files.

O Messaging Protocol

Intelligent I/O architecture (I

O) is a device driver architecture that

provides a standardized interface between I/O devices and operating

systems. I

O supports PCI bus mastering, overlapped I/O processing,

command queuing, scatter/gather memory access and auto-request

sense.

The I

O architecture uses a split-driver model, where an I/O driver

consists of two parts:

An Operating system Services Module (OSM) that translates

operating system specific I/O calls into a neutral message-based

format.

A Hardware Device Module (HDM) that accepts the OSM messages

and processes them on a specific controller and devices. (The

SmartRAID V controller functions as an HDM.)

This messaging system enables the modules to communicate without

specific knowledge of the underlying operating system or I/O bus.

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Acer SmartRAID V Bedienungsanleitung Seite 190