SCSI


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Related to SCSI: SCSI controller, SCSI connectors

SCSI

[′skəz·ē]
(computer science)

SCSI

SCSI

(Small Computer System Interface) Pronounced "scuzzy," SCSI is a hardware interface for up to 15 peripherals connected to one PCI or PCI Express card ("SCSI host adapter") on the motherboard. Introduced in 1986 by Shugart Associates (see SASI), this original parallel architecture was largely replaced by a serial version (see serial attached SCSI).

SCSI hard drives were used in mainframes, servers and storage arrays in the late-1980s and 1990s because they were very robust, and they were initially the only ones used in RAID configurations (see RAID). Eventually, less-costly IDE drives became highly reliable (see IDE and SATA).

SCSI Is a Mini-LAN
The SCSI bus is like a mini-LAN connecting 15 devices; actually 16 but the host counts as one. Any two can communicate at one time: host-to-peripheral and peripheral-to-peripheral. For more details, see SCSI Architecture Model, SCSI signaling, SCSI connectors and SCSI switch.


A "Scuzzy" Daisy Chain
SCSI enabled multiple peripherals to connect to one host adapter and take up only one slot in the computer. Devices included two ports to form a daisy chain.
References in periodicals archive ?
If this is not convincing enough, SCSI LTO 3 drives have Ultra320 SCSI ports capable of 320 MB/sec.
STA will schedule 'plugfests' (test labs) in 1Q 2004, in cooperation with the University of New Hampshire, to provide STA members with the opportunity to test all newly developed Serial Attached SCSI products for compatibility with Serial ATA and for interoperability.
The SCSI would prefer to have a professional football team to root for, but without one, the SCSI concentrates on the nine major pro and college teams that are here.
SCSI installation is generally not a do-it-yourself job; it's best to turn to an experienced technician.
Additional features of the 53C810, the first "three volt-friendly" PCI device on the market, include a 64-byte DMA FIFO and an 8-byte synchronous SCSI FIFO which provide speed matching.
The SCSI Trade Association was established in 1995 to provide a focal point for members to communicate the benefits of SCSI to the industry.
Approximately 10 years ago, disk drive engineering gurus established an MTBF rating for SCSI drives which drove the MTBF calculations over the 1 million/hour mark.
The Winstation ZIP 250 disk drive utilizes SCSI I and SCSI II technology and is compatible with most industrial software plus Windows 3.
Adaptec's ASPI software managers integrate SCSI into all major operating systems and, along with Adaptec's SCSI host adapters, are used by the industry's leading PC makers.
To meet the termination resistance requirements of the SCSI standards, Vishay uses fusible link technology to trim the termination value.
Redundant connection support enabled by this dual port functionality is a feature previously found only on Fibre Channel devices and is one of several key differentiating factors absent in Serial ATA and parallel SCSI drives.
5-inch form factor, maximum capacity for the E-Disk(R) Ultra320 SCSI is pegged at 155 GB.