/sys$common/syshlp/helplib.hlb
Sys Parameters, ACP_EXTCACHE
 *Conan The Librarian (sorry for the slow response - running on an old VAX) 

    ACP_EXTCACHE sets the number of entries in the extent cache.
    Each entry points to one contiguous area of free space on disk.
    A specification of 0 means no cache. Too small a value causes
    excessive XQP I/O operations, while too large a value causes
    excessive physical memory to be consumed by the extent cache.

    ACP_EXTCACHE is a DYNAMIC and FEEDBACK parameter.
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