VMS Help  —  Sys Parameters, ACP_DIRCACHE
    ACP_DIRCACHE sets the number of pages for caching directory
    blocks. Too small a value causes excessive XQP I/O operations,
    while too large a value causes excessive physical memory to be
    consumed by the directory data block cache.

    ACP_DIRCACHE is an AUTOGEN, DYNAMIC, and FEEDBACK parameter.
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