Library » 1997

SCSI Laying the Ground Work for Performance

SCSI Laying the Ground Work for Performance (PDF)
A White Paper prepared by Paul Aloisi of Unitrode, for the SCSI Trade Association

SCSI for the present and future The Small Computer Systems Interconnect (SCSI) that has become the workhorse of the high-end system and workstations. SCSI started from a modest beginning and has continued to improve as the need for performance arises. It started from a basic interface supporting up to 5 megabytes per second, and has improved performance with wide Ultra2 to 80 megabytes per second shipping today.
 
The SCSI standard has been balancing the system speed requirements, system cost and a versatile interconnect to allow the widest variety of options to be connected to the system. The cost performance interface allows workstations and PC's to connect to scanners, CDRs, CDs, CD changers, tape drives, cartridge drives and hard drives with flow control to optimize system throughput.

Expanding the SCSI Bus

Expanding the SCSI Bus (PDF)
A White Paper prepared by Marc D. Brooks of Paralan, for the SCSI Trade Association

The Small Computer Systems Interface (SCSI) has been in existence for over 15 years. This parallel bus has become the most widely utilized mass storage interface in the computer industry. Its strong position in the market place permeates from the high end server applications through workstations down to the low end single user computer. The SCSI interface is projected by most industry analysts to maintain its hold on the mass storage market through the year 2005. This is due in large part to SCSI's inherent protocol flexibility, large support infrastructure, continued speed increases and the acceptance of SCSI Expanders in applications where the following needs have arisen:

Balanced LVD SCSI Drivers and Receivers

Balanced LVD SCSI Drivers and Receivers (PDF)
A White Paper prepared by Ken Stuart and Kelly Bryant of Symbios, for the SCSI Trade Association

The requirements for LVD drivers and receivers are defined in Annex A of the SCSI Parallel Interconnect-2 (SPI-2) specification and is available at:   ftp://www.symbios.com/pub/standards/io/x3t10/drafts/spi2.
 
The purpose of this article is to review these requirements and to show how a balanced LVD driver provides more system margin - and reliability -- for the system designer, system integrator, or VAR.

New Storage Interfaces

New Storage Interfaces (PDF)
A White Paper prepared by Greg Schulz of MTI, for the SCSI Trade Association

This white paper is based on the article "New Storage Interfaces" authored by Greg P. Schulz of MTI that appears in the April 1997 edition of Sys Admin Journal. This paper contains additional material not contained in the above mentioned article as well as general formatting changes.
 
Introduction
Changes are occurring with storage technology including lower cost per megabyte, faster drives, higher bandwidths, and applications requiring larger amounts of storage and throughput. This has resulted in a storage and I/O growth explosion closing the gap between I/O, Storage, and CPU performance. Our discussion centers around storage interfaces that enable data to be stored and retrieved from storage devices (Disk Drives, RAID Arrays, Tape Drives, and Solid State Disk). Network interfaces such as Ethernet®, FDDI, Token Ring, Fast Ethernet, and ATM can also be used as storage transports for distributed or network file systems such as NFS. However, this discussion centers on technology used primarily for storage.

Parallel SCSI Grows, Shrinks and Stays the Same (PDF)
A White Paper prepared by Bill Ham of Digital Equipment Corp., for the SCSI Trade Association

This article is intended to document specific features of parallel SCSI that characterize the migrations over the past few years and into the next few years. Features that grow, those that shrink, and those that stay the same are explored.