ATTO Technology ExpressPCI UL4S Manuale di installazione e funzionamento - Pagina 6

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1 SCSI is a key technology for storage

Ultra320 SCSI represents the seventh generation of SCSI technology, an I/O interface that increases

performance while maintaining backward compatibility and legacy support.

From its roots in 5 MB/sec. transfer rates, SCSI

has evolved as the leading interface for disk drive

connections in high performance servers. It

features maximum data transfer rates of 320

MB/second, full backward compatibility with

older versions of SCSI protocols and additional

features to improve performance and reliability.

Ultra320 is a powerful storage technology. All

forms of digital content, from e-mail, video, film,

and audio, to streaming video, and imaging, are

Exhibit 1-1 How SCSI has evolved.

Narrow

Data transfer

<5 MB/sec

rates

SCSI protocol

SCSI-1

Specification

SPI-1

Transfer type

Single-

Ended

Glossary

Some terms used in the storage industry are defined below. More information is available through the

ATTO Technology website (

Term

Definition

ANSI

American National Standards Institute

Asynchronous

AIP: although most Ultra320traffic is sent synchronously and protected by CRC, some

Information

information is still sent asynchronously. AIP implements CRC-level error checking on

Protection

asynchronous traffic ensuring end-to-end data integrity.

bit

Smallest unit of data a computer can process: a single binary digit with a value of either 0 or 1

byte

an ordered set of 8 bits

CRC

Cyclic Redundancy Checking, an error-correcting code which calculates a numeric value for

received and transmitted data. If no error has occurred during transmission, the CRC for both

received and transmitted data should be the same.

destination address

A value in the frame header of each frame which identifies the port in the node where the

frame is being sent

domain validation

Before sending data, domain validation verifies that the physical connection is capable of

handling the negotiated transfer speed. If the system determines that Ultra320speeds are not

feasible, a slower speed is enforced.

ATTO Technology Inc. ExpressPCI Host Adapter Installation and Operation Manual

Fast/

Ultra

Narrow

10 MB/sec

20 MB/sec

SCSI-2

SCSI-3

SPI-1

Single-

Ended HVD

) and the SCSI Trade Association (

www.attotech.com

driving the unprecedented growth in storage that

pushes the I/O bandwidth, requiring more

advanced interfaces to handle data transfer.

SCSI advantages

• Backward compatible with older versions of

SCSI. Newer adapters will negotiate to the

lower speeds of legacy devices.

• Minimal investment to upgrade technology.

Older equipment may still be used with newer

equipment. Upgrade does not require

replacement of infrastructure.

Ultra/WIDE

Ultra2

40 MB/sec

80 MB/sec

SCSI-3

SPI-1

SPI-2

Single-

LVD

Ended HVD

Ultra160

Ultra320

160 MB/sec 320 MB/sec

SCSI-3

SPI-3

SPI-4

LVD