The SCSI Bus Interface
96122 • Revision: F Chapter 1 General Information 3
Benefits
FIGURE 1-1 is an example of a multi-initiator, multi-target configuration using a
library and four tape drives.
A small computer system interface also provides these benefits:
■ Low overhead
■ High transfer rates
■ A high-performance buffered interface
■ Conformance to industry standards
■ Plug compatibility for easy integration
■ Error recovery, parity, and sequence checking provides high reliability
■ Provisions in the command set for vendor-unique fields
■ Standard or common command sets with an intelligent interface that provides
device independence
The SCSI bus uses seven elements for interface control, data transfer, commands,
and status. Chapter 3, “SCSI Bus Operations,” explains each of these elements in
more detail.
Implementation
Implementation of the SCSI bus for the library supports:
■ 8-bit wide transfers, asynchronous; 16-bit wide selection
■ Disconnect and reselect
■ Multiple initiator
■ Hard resets
■ Single-ended LVD
■ SCSI-3, 68-pin P-cable
Implementation for the library does not support:
■ Soft resets
■ Command queuing
■ Command linking
■ Asynchronous event notification
■ Extended contingent allegiance
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