By Marc Farley

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Data Availability Through a Single SCSI I/O Controller SCSI was originally conceived as a way to attach many different types of devices to a common I/O bus, controlled by a single I/O controller. The capability to connect many kinds of devices makes SCSI extremely versatile for customers with a variety of application and storage needs. However, two SCSI host adapters do not easily share the same SCSI bus. SCSI’s evolution as a single-controller architecture allowed it to be very reliable but makes it unpredictable for connecting more than one SCSI host adapter to a single bus.

Things get a little more interesting when the wide SCSI bus is used. To maintain a level of compatibility with the existing narrow SCSI bus, wide SCSI preserves narrow SCSI’s priority scheme and places the additional IDs, 8 through 15, at a lower priority. Therefore, the priority of SCSI IDs for wide SCSI is as follows: While seven and fifteen addresses are more than enough for most workstation applications, storage networking applications, such as RAID, require more addresses to achieve the capacity desired.

Fibre Channel blends gigabit networking technology with I/O channel technology in a single integrated technology family. Whereas SCSI, by default, implies the parallel SCSI bus with multiple data lines running in parallel, Fibre Channel implements serial SCSI with a single optical or copper cable connecting network nodes, as shown in the illustration that follows. It is the application of a serial SCSI protocol that enables Fibre Channel cables to extend up to 10,000 meters. Compared to the 25 meter maximum of SCSI, this seems almost too good to be true.

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