ACL 4/52 Software Interface Guide
Document 6211225-03
Version 3.0
Purpose
1-3
Purpose
This guide was written for software engineers developing the
application and hierarchical mass storage software that accesses the
ACL 4/52 Automated Tape Library (library). The manual describes the
SCSI-2 software interfaces, discusses performance issues as well as
error handling. The document is divided into the following sections:
•
Section 1, “Introduction,” describes the purpose of this manual,
provides a list of its contents and a list of related documentation.
•
Section 2, “Theory of Operation,” contains detailed discussions of
the Medium Changer Elements, Events, Operational Sequences,
Configuration and Error Recovery Procedures as well as System
Performance and Diagnostic Support issues.
•
Section 3, “Software Interfaces,” describes the specific terminology
of the Small Computer Systems Interface (SCSI-2).
Conventions Used in this Guide
The following conventions are used in this guide:
All binary numbers are succeeded by “b”.
All hexadecimal numbers are succeeded by “h”.
Error or attention conditions are represented in parenthesis that
translate as follows:
(SK=S ASC=AA ASCQ=QQ)
where:
S
=
hexadecimal sense key value
AA
=
hexadecimal additional sense code
QQ =
hexadecimal additional sense code qualifier
Definitions of these values are located in Appendix A.