Confusion about required_mirror_free_mb in asm

Hi!
i have confusion about required_mirror_free_mb in asm.
i have 6 disks with normal redundancy and 4 failgroups.
SQL> select STATE,TOTAL_MB,FREE_MB ,NAME,FAILGROUP from v$asm_disk;
STATE TOTAL_MB FREE_MB NAME FAILGROUP
NORMAL 2047 1421 ASMDISK1 FG1
NORMAL 2047 1424 ASMDISK2 FG1
NORMAL 2047 1424 ASMDISK3 FG2
NORMAL 2047 1424 ASMDISK4 FG2
NORMAL 2047 1423 ASMDISK5 ASMDISK5
NORMAL 2047 1422 ASMDISK6 ASMDISK6
6 rows selected.
Almost all 6 disk have same space consumption.
SQL> select GROUP_NUMBER,DISK_NUMBER,STATE,TOTAL_MB,FREE_MB ,NAME from v$asm_disk;
GROUP_NUMBER DISK_NUMBER STATE TOTAL_MB FREE_MB NAME
1 0 NORMAL 2047 1421 ASMDISK1
1 1 NORMAL 2047 1424 ASMDISK2
1 2 NORMAL 2047 1424 ASMDISK3
1 3 NORMAL 2047 1424 ASMDISK4
1 4 NORMAL 2047 1423 ASMDISK5
1 5 NORMAL 2047 1422 ASMDISK6
6 rows selected.
SQL>
SQL> select name, type, total_mb, free_mb, required_mirror_free_mb,usable_file_mb from v$asm_diskgroup;
NAME TYPE TOTAL_MB FREE_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB
DATA NORMAL 12282 8538 4094 2222
SQL>
Here is my question that how asm desides REQUIRED_MIRROR_FREE_MB i.e 4GB in above case........
please can anybody answer me.....
regards
M.usman

thank you for your reply...now confusion has increased even more....
now i have change configuration a bit....
STEp 1)
i have 6 Disks each of 2 gb in size And 3 Failgroups FG1,FG2,FG3.
FG1
ASMDISK1
ASMDISK2
FG2
ASMDISK3
ASMDISK4
FG3
ASMDISK5
ASMDISK6
SQL> select GROUP_NUMBER,DISK_NUMBER,STATE,TOTAL_MB,FREE_MB ,NAME from v$asm_disk;
GROUP_NUMBER DISK_NUMBER STATE TOTAL_MB FREE_MB NAME
1 0 NORMAL 2047 1420 ASMDISK1
1 1 NORMAL 2047 1418 ASMDISK2
1 2 NORMAL 2047 1420 ASMDISK3
1 3 NORMAL 2047 1419 ASMDISK4
1 4 NORMAL 2047 1421 ASMDISK5
1 5 NORMAL 2047 1420 ASMDISK6
6 rows selected.
SQL> select name, type, total_mb, free_mb, required_mirror_free_mb,usable_file_mb from v$asm_diskgroup;
NAME TYPE TOTAL_MB FREE_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB
DATA NORMAL 12282 8518 4094 2212
required_mirror_free_mb=4GB as you said that mirroring is per failgroup so it means that the largest failure could occur is that any failgroup fails,failgroup comprises of 2 2gb disk so its 4gb.
STEp 2)
I deleted two disks 5 and 6 in FG3
now i have two failgroups FG1 and FG2
FG1
ASMDISK1
ASMDISK2
FG2
ASMDISK3
ASMDISK4
SQL> select GROUP_NUMBER,DISK_NUMBER,STATE,TOTAL_MB,FREE_MB ,NAME from v$asm_disk;
SQL> select STATE,TOTAL_MB,FREE_MB ,NAME,FAILGROUP from v$asm_disk;
STATE TOTAL_MB FREE_MB NAME FAILGROUP
NORMAL 2047 0
NORMAL 2047 0
NORMAL 2047 1128 ASMDISK1 FG1
NORMAL 2047 1127 ASMDISK2 FG1
NORMAL 2047 1128 ASMDISK3 FG2
NORMAL 2047 1127 ASMDISK4 FG2
6 rows selected.
SQL> select name, type, total_mb, free_mb, required_mirror_free_mb,usable_file_mb from v$asm_diskgroup;
NAME TYPE TOTAL_MB FREE_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB
DATA NORMAL 8188 4510 *2047* 1231
Now still the largest failure could occur is that any failgroup fails,failgroup comprises of 2 2gb disk so its agian 4gb.
But here its showing 2gb here i am confused.
Maybe my concept is wrong please help ...please dont mind anything that i am again n again asking questions.

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    If you have an AOL email address (like [email protected]), and you are not using that as another Apple ID, you can change the AOL Username Apple ID to that. Otherwise, you can change it to any valid email address (which you will have to verify when you change to it).
    Hope that clears it up. Post back if it doesn't!
    Cheers,
    GB

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    Oracle can use the Online Redo Logs for Recovery. Normally this happens in the case of Instance Recovery (e.g. from a server crash or shutdown abort) -- where the datafiles are not restored from a prior backup.
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    Hemant K Chitale
    Edited by: Hemant K Chitale on Oct 10, 2011 11:43 AM
    Edited by: Hemant K Chitale on Oct 10, 2011 11:44 AM
    Edited by: Hemant K Chitale on Oct 10, 2011 4:33 PM
    Edited by: Hemant K Chitale on Oct 10, 2011 4:34 PM

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