/STALL=WRITES[=nnn]
       /NOSTALL=WRITES[=nnn]

    Using /STALL=WRITES[=nnn] qualifier, you can stall the write
    operations for nnn seconds. nnn is the number of seconds for
    which you can stop write operations. If no value is specified
    for nnn, the lock is released after SHADOW_MBR_TMO seconds. The
    default is SHADOW_MBR_TMO.

    /NOSTALL=WRITES[=nnn] releases the lock after nnn seconds so that
    write operations can continue on the shadow set.