System for adaptively optimizing automated optical library manag

Details System for adaptively optimizing automated optical library manag System for adaptively optimizing automated optical library manag

1995-10-22

1996-10-15

Lee, Thomas C.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

395650, 369 34, 364DIG1, 3642434, 3642432, 3642715, 3642705, G06F 1208

Patent

active

055663486

ABSTRACT:
A method for managing Data Storage Medium (DSM) mount and demount decisions in an automated data storage library that dynamically optimizes both sequential and random data access workloads. The demount decisions adapt to time-varying characteristics in the relative workload mix. When the workload is primarily sequential, the mount and demount decision procedure favors longer mount residency for sequential access streams, reducing the robotic picker activity and reducing response time for mount requests. When the workload is predominantly random access, sequentially accessed DSM residency time is generally reduced and preemptive demounts are more readily implemented. The disclosed method provides for preemptive demounts and uses a two-element decision process to select either a Least Recently Used (LRU) or a Least Recently Mounted (LRM) decision parameter. The relative weights of the LRU and LRM decision tests are varied responsive to measured changes in data access workload characteristics.

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"Optical Library Dataserver Model 3995-151" by the ITSC; IBM Storage Subsystem Enhancements; Jul. 1992, pp. 105-146.

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