/sys$common/syshlp/helplib.hlb SET, DEVICE, Qualifiers, /MEMBER_TIMEOUT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MEMBER_TIMEOUT=n ddcu:

    Specifies the timeout value to be used for a member of a shadow
    set.

    The value supplied by this qualifier overrides the system
    parameter, SHADOW_MBR_TMO, for this specific device. Each member
    of a shadow set can be assigned a different MEMBER_TIMEOUT value.

    The valid range for n is 1 to 16,777,215 seconds.

    The device specified must be a member of a shadow set that is
    mounted on the node where the command is issued.