SCSI


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SCSI

[′skəz·ē]
(computer science)

SCSI

SCSI

(Small Computer System Interface) Pronounced "scuzzy," SCSI is an earlier hardware interface for up to 15 peripherals connected to one expansion card, called a "SCSI host adapter." Introduced in 1986 by Shugart Associates (see SASI), this parallel architecture was replaced by its serial successor (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. Initially the only kind chosen for multi-drive RAID configurations, less-costly IDE drives were eventually used (see RAID, IDE and SATA).

SCSI Was a Mini-Network
The SCSI bus connects up to 15 devices in a daisy chain topology, and 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 take up only one expansion slot in the computer.







SCSI Ports
To enable the daisy chain, all SCSI devices had one "in" and one "out" port plus a dial to set the device number. These SCSI-1 sockets are on the back of a 1990s disk drive. See SCSI connectors.
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.
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.
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.
E-Disk(R) storage solutions are offered with SCSI, IDE/ATA, Fibre Channel, USB, FireWire, Compact PCI, VME, PMC, and Ethernet interfaces in 2.
One of the most significant attributes of Serial Attached SCSI is that it allows SCSI enterprise class drives to coexist with lower cost/gigabyte Serial ATA drives.
To meet the termination resistance requirements of the SCSI standards, Vishay uses fusible link technology to trim the termination value.