Summary

SCSI can be a confusing subject for those who haven't dealt with it before. The various levels of SCSI, along with issues such as termination, SCSI IDs, and SCSI BIOSes, can be intimidating. The rewards of using SCSI devices can be considerable, however, particularly in a highperformance server environment. Today's fastest SCSI devices are faster than today's fastest EIDE devices. SCSI is inherently better suited than EIDE to communicate with several devices simultaneously, and to use a large number of different SCSI devices. These benefits can be mitigated by the need to mix modern, high-speed hard disks with older, lower-speed SCSI devices

Chapter 9

such as removable disks or scanners. Such a mixture might necessitate the use of two host adapters or shorter SCSI cables and lower transfer rates.

Fortunately, Linux support for SCSI host adapters is quite good. Aside from a few just-introduced models, most major SCSI host adapters and chipsets are supported by Linux, some with official support from the SCSI host adapter manufacturer. Support is actually worse at the low end of the scale, among bottom-of-the-line PIO ISA SCSI host adapters, particularly those from small manufacturers. Fortunately, you can usually replace such boards with better low-end PCI host adapters for under $100, and get a performance boost in the bargain.

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The Ultimate Computer Repair Guide

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