Fraction Redolog

Hi Guys,
I have some question. Now in my database i have twelve groups of redo files:

SQL> select * from v$log;

    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
         1          1     194216  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         2          1     194217  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         3          1     194218  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         4          1     194219  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         5          1     194220  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         6          1     194221  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         7          1     194222  104857600          2 NO  CURRENT             8.2726E+12 08-SEP-10
         8          1     194211  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
         9          1     194212  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
        10          1     194213  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
        11          1     194214  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10
        12          1     194215  104857600          2 YES ACTIVE              8.2726E+12 08-SEP-10

12 rows selected.

Now i want change my redolog to two group where one group have two member/Redo. One Group have size 1G, but it's produce ten archive with each archive's size is 100M.