OPCACHEMAX, an Optical Subsystem configuration parameter
The OPCACHEMAX configuration parameter specifies the total amount of space that is available for simple-large-object retrieval in the memory cache that the Optical Subsystem uses.
Until the memory cache fills, it stores simple large objects that are requested by any application. Simple large objects that cannot fit in the cache are stored on disk in the blobspace that the STAGEBLOB configuration parameter indicates. You can increase the size of the cache to reduce contention among simple-large-object requests and to improve performance for requests that involve the Optical Subsystem.