VMS Help Sys Parameters, VCC_FLAGS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (Alpha only) 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 can't 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 is the default for VAX systems.

    2      Enables file system data caching and selects the Extended
           File Cache. This is the default for Alpha systems.

    VCC_FLAGS is an AUTOGEN parameter.