VMS Help  —  Sys Parameters, CLUSTER_CREDITS
    CLUSTER_CREDITS specifies the number of per-connection buffers a
    node allocates to receiving VMS$VAXcluster communications.

    If the SHOW CLUSTER command displays a high number of credit
    waits for the VMS$VAXcluster connection, you might consider
    increasing the value of CLUSTER_CREDITS on the other node.
    However, in large cluster configurations, setting this value
    unnecessarily high consumes a large quantity of nonpaged pool.
    Each receive buffer is at least SCSMAXMSG bytes in size but might
    be substantially larger depending on the underlying transport.

    It is not required for all nodes in the cluster to have the same
    value for CLUSTER_CREDITS.

    The default value is currently 32. Unless a system has very
    constrained memory available, VSI recommends that these values
    not be increased.
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