The static system parameter VCC_FLAGS enables and disables file
    system data caching. If caching is enabled, VCC_FLAGS controls
    which file system data cache is loaded during system startup.

    Value  Description

    0      Disables file system data caching on the local node and
           throughout the OpenVMS Cluster.

           In an OpenVMS Cluster, if caching is disabled on any node,
           none of the other nodes can use the extended file cache
           or the virtual I/O cache. They cannot cache any file data
           until that node either leaves the cluster or reboots with
           VCC_FLAGS set to a nonzero value.

    1      Enables file system data caching and selects the Virtual
           I/O Cache.  This value is relevant only for Alpha systems.

    2      Enables file system data caching and selects the extended
           file cache.

                                   NOTE

       On x86 and Integrity servers, the volume caching product
       ([SYS$LDR]SYS$VCC.EXE) is not available. XFC caching is the
       default caching mechanism. Setting the VCC_FLAGS parameter
       to 1 is equivalent to not loading caching at all or to
       setting VCC_FLAGS to 0.

    VCC_FLAGS is an AUTOGEN parameter.