/sys$common/syshlp/helplib.hlb Sys Parameters, MSCP_CMD_TMO  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    MSCP_CMD_TMO is the time in seconds that the OpenVMS MSCP server
    uses to detect MSCP command timeouts. The MSCP Server must
    complete the command within a built-in time of approximately
    40 seconds plus the value of the MSCP_CMD_TMO parameter.

    The MSCP_CMD_TMO default value of 0 is normally adequate. A
    value of 0 provides the same behavior as in previous releases
    of OpenVMS (which did not have an MSCP_CMD_TMO system parameter).
    A nonzero setting increases the amount of time before an MSCP
    command times out.

    If command timeout errors are being logged on client nodes,
    setting the parameter to a nonzero value on OpenVMS servers
    reduces the number of errors logged. Increasing the value of
    this parameter reduces the numb client MSCP command timeouts and
    increases the time it takes to detect faulty devices.

    If you need to decrease the number of command timeout errors,
    Compaq recommends that you set an initial value of 60. If timeout
    errors continue to be logged, you can increase this value in
    increments of 20 seconds.

    MSCP_CMD_TMO is a DYNAMIC parameter.