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SCSI switch

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A device that cross connects computers to SCSI devices and overcomes certain SCSI limitations. The regular SCSI interface is a shared bus architecture, but a SCSI switch provides the full bandwidth between any two devices, greatly increasing overall throughput. This is the same concept as shared Ethernet versus an Ethernet switch.

SCSI switches also double the cable distance between devices and minimize access contention, because the devices are not subject to a priority by their ID numbers. In addition, the 7-device or 15-device limit gives way to any number of devices, because the switches can be cascaded.

Shared Vs. Switched
Switched SCSI eliminates many limitations, including bandwidth, cable distance and number of devices. The switch has a backplane capable of handling the full SCSI bandwidth at each of its ports.


Extending the Limitations
GigaLabs pioneered the SCSI switch, but later went out of business. This JigSaw 8-slot model provided 16 non-blocking ports between SCSI devices. (Image courtesy of GigaLabs, Inc.)
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Q: Is it possible to run a SCSI switch between a peripheral device and two hosts?
Ask THE SCSI FIPET by Computer Technology Review
When it detects an error, an automated two by four SCSI switch switches network operations to a standby server in the cluster.
APCON Inc. to ship POWERSWITCH for NT in early November by Business Wire
BUSINESS WIRE)--April 4, 1995--APPLIED CONCEPTS has added six Rack Mountable versions of the popular SCSI SWITCH to its product line.
APPLIED CONCEPTS INC. announces RACK MOUNT SCSI SWITCH by Business Wire
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