GB_DEFPERCENT

   (Alpha and Integrity servers) If a file is connected to RMS with
   the RMS global buffer DEFAULT option enabled, either a percentage
   (GB_DEFPERCENT) of the file is cached or up to GB_CACHEALLMAX
   blocks of it are cached, whichever results in a larger global
   buffer count. A percentage greater than 100 percent can be
   specified for GB_DEFPERCENT to provide growing room for a file
   in the global cache.

   Note that although a maximum cache size of %x7FFFFFFF is
   supported for an indexed file, sequential and relative file
   organizations are restricted to a maximum cache size of 32767.

   GB_DEFPERCENT is a DYNAMIC parameter.