/OPTIMIZE=LOCKING [or =IO]=distance

    Supplies the calculation with the type of intersite cluster
    communications to be optimized as follows:

    o  LOCKING indicates that the window size is to be optimized
       for lock messages that are relatively small, or for ICC
       communications using message sizes of up to a few hundred
       bytes.

    o  IO indicates that the window size is to be optimized for MSCP
       served IO, or for ICC communications using large messages.