Overview
ISO/IEC 9318-4:2002 - "Information technology - Intelligent peripheral interface - Part 4: Device generic command set for magnetic tape drives (IPI-3 tape)" defines the device-generic command set for magnetic tape drives using the IPI‑3 (Intelligent Peripheral Interface) family. The second edition (2002) replaces the 1990 edition as a technical revision, with a revised scope, added attribute usage, and new position control parameters. This standard complements other Intelligent Peripheral Interface (IPI) standards to enable high‑performance, general‑purpose parallel peripheral interfacing for tape storage.
Key topics and technical requirements
The standard specifies the logical interface and command semantics required for interoperable tape drive operation. Major technical topics include:
- Logical interface characteristics: PhysicalBlocks, DataBlocks, extents, partitions, alternate data areas, partition parameters, and block numbering.
- Message packet structure: Command and response packet formats for device operations.
- Control commands: NOP, facility operations, attributes, path and port control, operating mode, abort/resume, and access permits.
- Position commands: SPACE, POSITION CONTROL (with new parameters in the 2002 edition), REPORT POSITION, RECORD POSITION.
- Transfer commands: READ, WRITE, READ RAW DATA, SEARCH, and related transfer semantics including buffer operations and physical/ECC handling.
- Combination and auxiliary commands: COPY, COMPARE, SHADOW READ/WRITE, and other combined operations.
- Diagnostic and logging: PERFORM DIAGNOSTICS, READ/WRITE ERROR LOG, diagnostic control and error reporting.
- Attributes & parameters: Detailed usage of attributes and many parameter fields governing behavior and status reporting.
Keywords: ISO/IEC 9318-4:2002, IPI-3 tape, intelligent peripheral interface, device-generic command set, tape drive commands.
Applications and who uses it
ISO/IEC 9318-4:2002 is used where standardized, low‑level command/control for magnetic tape drives is required:
- Tape drive manufacturers for firmware and hardware interface implementations.
- System integrators and OEMs building storage subsystems and backup appliances.
- Firmware and device-driver developers implementing command packet parsing, buffer management, positioning and error handling.
- Quality assurance and test labs validating conformance, interoperability and diagnostic reporting.
- Archivists and enterprise backup architects who require predictable tape behavior for large-scale data retention and disaster recovery.
Benefits include improved interoperability, deterministic positioning and transfer semantics, and a consistent diagnostic/logging model.
Related standards
- Complements other parts of the Intelligent Peripheral Interface (IPI) family and related ISO/IEC storage interface standards. For conformance, refer to the broader IPI series and other ISO/IEC documents covering device classes and physical interfaces.