Logical Object Table for Disk Archiving Compatibility
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Solution Overview
Problem
Conventional archiving apparatuses using magnetic tapes face compatibility issues with disk-type recording media due to incompatible command sets, limiting the ability to replace tape apparatuses with disk apparatuses in backup or archiving applications.
Innovation Solution
An information processing apparatus and method that generates a logical object table for each container file, recording it on memory and transferring it to the recording medium when the file size reaches a predetermined value, allowing for control and management of container files, enabling access to disk-type recording media using conventional SSC command sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If magnetic tapes are used as recording media, then long-term storage capability is improved, but random access performance deteriorates
Solution Approach 1:
The archiving apparatus is designed to support multiple recording media types (magnetic tapes and disk-type recording media) through a unified command interface. The system can selectively use tape apparatus for sequential access operations or disk apparatus for random access operations, making the archiving system versatile enough to handle both long-term storage and fast retrieval requirements
2Speed
If disk-type recording media are used to improve random access performance, then speed is improved, but compatibility with SSC command sets deteriorates
Solution Approach 1:
A command conversion mechanism acts as an intermediary between the SSC command interface and the disk apparatus. The system translates SSC commands intended for tape apparatus into appropriate commands for disk apparatus, enabling disk-type recording media to be used while maintaining compatibility with existing SSC-based application programs
Solution Approach 2:
The archiving apparatus implements a universal command interface that can communicate with both tape apparatus and disk apparatus using the SSC command set. This multi-functionality allows the system to maintain compatibility with existing applications while supporting faster disk-based storage
Data Source
AI summary
An archiving apparatus that realizes high-speed seek processes and the like by setting a logical object table for each container file with a predetermined size, and closing the container file under a predetermined condition is provided. A data processing section that executes control of access to a recording medium generates a logical object table for managing a container file including logical objects which are recorded data units, and records the logical object table on a memory. In a case where a prescribed condition is satisfied, for example, the container file size has become equal to or larger than a prescribed end reference value, and so on, while a process on the container file is being executed, the logical object table is read out from the memory, and recorded on the recording medium, and the container file is closed.