VCC_MAX_IO_SIZE

   (Alpha and Integrity servers) The dynamic system parameter VCC_
   MAX_IO_SIZE controls the maximum size of I/O that can be cached
   by the extended file cache. It specifies the size in blocks. By
   default, the size is 127 blocks.

   Changing the value of VCC_MAX_IO_SIZE affects reads and writes to
   volumes currently mounted on the local node, as well as reads and
   writes to volumes mounted in the future.

   If VCC_MAX_IO_SIZE is 0, the extended file cache on the local
   node cannot cache any reads or writes. However, the system is
   not prevented from reserving memory for the extended file cache
   during startup if a VCC$MIN_CACHE_SIZE entry is in the reserved
   memory registry.

   VCC_MAX_IO_SIZE is a DYNAMIC parameter.