How to Tune IPM Optical Disc Swapping
Last updated on JUNE 30, 2016
Applies to:Oracle Imaging and Process Management - Version: 18.104.22.168.0 to 10.1.3.6 - Release: Stellent to 10gR3
Information in this document applies to any platform.
Why is it that some optical jukebox drives are swapping frequently, while others never swap. How can this be tuned?
The Storage Server (specifically the subsystem) tracks which volumes are in the optical drives, and how long and often these volumes are accessed. In order to do this, an algorithm called LRU (Least Recently Used) is used. The LRU enables the selection of the best volume (least used) to remove when needing to insert a new volume. Also, there is logic to not allow one volume to remain in the drive too long, based upon how long it has been in the drive. The LRU value in the REGISTER.DAT gets written only when the storage server is shut down. In IPM 7.6 and later, LRU is not stored to the ST_VOLUMES table at all.
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