How to Check ASM Disk Group Size in Oracle

We can check the ASM disk group size using the following DBA scripts:

SELECT
    name group_name
    , sector_size sector_size
    , block_size block_size
    , allocation_unit_size allocation_unit_size
    , state state
    , type type
    , total_mb total_mb
    , (total_mb - free_mb) used_mb
    , ROUND((1- (free_mb / total_mb))*100, 2) pct_used
    FROM
    v$asm_diskgroup
    ORDER BY
    name

Example:

SQL> SELECT
     2  name group_name
     3  , sector_size sector_size
     4  , block_size block_size
   , allocation_unit_size allocation_unit_size
     5  , state state
     6  , type type
     7    8  , total_mb total_mb
     9  , (total_mb - free_mb) used_mb
    10  , ROUND((1- (free_mb / total_mb))*100, 2) pct_used
    11  FROM
    12  v$asm_diskgroup
    13  ORDER BY
   name
    14   15  /
    GROUP_NAME                     SECTOR_SIZE BLOCK_SIZE ALLOCATION_UNIT_SIZE STATE      TYPE     TOTAL_MB    USED_MB   PCT_USED
   ------------------------------ ----------- ---------- -------------------- ---------- ------ ---------- ---------- ----------
   DATA                                   512       4096              1048576 CONNECTED  EXTERN    6289446    5252541      83.51
   FRA                                    512       4096              1048576 CONNECTED  EXTERN     511591     278989      54.53
   REDO1                                  512       4096              1048576 CONNECTED  EXTERN      20471         53        .26
   REDO2                                  512       4096              1048576 CONNECTED  EXTERN      20471         53        .26
    SQL>