GB_CACHEALLMAX

   (Alpha and Integrity servers) If a file is connected to RMS with
   the RMS global buffer DEFAULT option enabled, the number of of
   blocks cached is either a maximum of the GB_CACHEALLMAX parameter
   or a percentage of the file, whichever results in a larger global
   count.

   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_CACHEALLMAX is a DYNAMIC parameter.