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ATTO Technology Inc. ExpressPCI Host Adapter Installation and Operation Manual

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

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.

Exhibit 1-1 How SCSI has evolved.

Glossary

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

ATTO Technology website (

www.attotech.com

) and the SCSI Trade Association (

www.scsita.org

Narrow

Fast/

Narrow

Ultra Ultra/WIDE Ultra2 Ultra160 Ultra320

Data transfer

rates

<5 MB/sec 10 MB/sec 20 MB/sec 40 MB/sec 80 MB/sec 160 MB/sec 320 MB/sec

SCSI protocol SCSI-1 SCSI-2 SCSI-3 SCSI-3 SCSI-3 SCSI-3 SCSI-3

Specification SPI-1 SPI-1 SPI-1 SPI-1 SPI-2 SPI-3 SPI-4

Transfer type Single-

Ended

Single-

Ended HVD

Single-

Ended HVD

Single-

Ended HVD

LVD LVD LVD

Term Definition

ANSI American National Standards Institute

Asynchronous

Information

Protection

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

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

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.

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