Library /sys$common/syshlp/tracehlp.hlb START, /MAXIMUM_BUFFERS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /MAXIMUM_BUFFERS=n

    The number of buffers that are used internally  by  TRACE  to  hold
    data.  Increasing this value may avoid trace records being lost.

    The default value is 3 if a remote node is being traced  or  10  if
    tracing is being done locally.