How OCR mirroring works

Hi Gurus ,
As per Oracle docs "Normal redundancy disk groups provide   3 voting disk files, 1 OCR and 2 copies(one primary and one secondary mirror).
Does it means there are 2 OCR in this diskgroup ? .Then ,
Where is the OCR primary and Mirror created in this case?Are they been on separate failure group ? Then how can I check the same through asmcmd?
Here is my environment set up
[grid@xxxx01 ~]$ ocrcheck
Status of Oracle Cluster Registry is as follows :
         Version                  :          3
         Total space (kbytes)     :     262120
         Used space (kbytes)      :       2800
         Available space (kbytes) :     259320
         ID                       : 1074808153
         Device/File Name         : +OCR_VOTE
                                    Device/File integrity check succeeded
                                    Device/File not configured
                                    Device/File not configured
                                    Device/File not configured
                                    Device/File not configured
         Cluster registry integrity check succeeded
         Logical corruption check bypassed due to non-privileged user
My +OCR_VOTE is in normal redundancy , while looking at ASM level
[grid@xxxx01 ~]$ asmcmd
ASMCMD>
ASMCMD> cd +OCR_VOTE
ASMCMD> ls
ehrptpi-cluster/
ASMCMD> cd xxxxxi-cluster/
ASMCMD> ls
ASMPARAMETERFILE/
OCRFILE/
ASMCMD> cd OCRFILE/
ASMCMD> ls -l
Type     Redund Striped Time             Sys Name
OCRFILE MIRROR COARSE   JAN 07 20:00:00 Y    REGISTRY.255.763526561
ASMCMD>
Here I can see only one OCR file . Then what is meant by 1 OCR and 2 copies ?
Can somebody shed some light on how OCR mirroring actually works ?
Thanks and Regards,
Mahi

Hi Thomas,
Thanks for the guidance .Please find the output from my RAC environment.
SQL> select distinct g.name "Diskgroup", g.type "redundancy",
    d.failgroup "Failgroup" ,d.path "diskwithinfailgroup"
    from v$asm_diskgroup g,
      v$asm_disk d
    where g.group_number = d.group_number
   and g.NAME = 'OCR_VOTE'
SQL> /
Diskgroup                      redund Failgroup                      diskwithinfailgroup
OCR_VOTE                       NORMAL OCR_VOTE_0000                  /dev/oracleasm/disks/GRID01
OCR_VOTE                       NORMAL OCR_VOTE_0001                  /dev/oracleasm/disks/GRID02
OCR_VOTE                       NORMAL OCR_VOTE_0002                  /dev/oracleasm/disks/GRID03
SQL>
SQL> select distinct GROUP_KFFXP, NUMBER_KFFXP, name, DISK_KFFXP from x$kffxp, v$asm_alias where GROUP_KFFXP=GROUP_NUMBER and NUMBER_KF
FXP=FILE_NUMBER and system_created='Y' and name like '%REGIST%';
GROUP_KFFXP NUMBER_KFFXP NAME
DISK_KFFXP
1
253 REGISTRY.253.852564731
0
1
253 REGISTRY.253.852564731
2
1
255 REGISTRY.255.852564731
0
1
255 REGISTRY.255.852564731
1
1
255 REGISTRY.255.852564731
2
SQL>
select group_number,disk_number,failgroup,substr(path,1,48) as "Path(48 Chars)" ,mount_status,header_status,mode_status,state,total_mb,free_mb
from v$asm_disk order by group_number,disk_number;
GROUP_NUMBER DISK_NUMBER FAILGROUP                      Path(48 Chars)                                   MOUNT_S HEADER_STATU MODE_ST STATE
           0           0                                /dev/oracleasm/disks/DATA15                      CLOSED FORMER       ONLINE NORMAL
           0           6                                /dev/oracleasm/disks/DATA14                      CLOSED FORMER       ONLINE NORMAL
           0          10                                /dev/oracleasm/disks/DATA10                      CLOSED FORMER       ONLINE NORMAL
           0          11                                /dev/oracleasm/disks/DATA09                      CLOSED FORMER       ONLINE NORMAL
           1           0 OCR_VOTE_0000                  /dev/oracleasm/disks/GRID01                      CACHED MEMBER       ONLINE NORMAL
           1           1 OCR_VOTE_0001                  /dev/oracleasm/disks/GRID02                      CACHED MEMBER       ONLINE NORMAL
           1           2 OCR_VOTE_0002                  /dev/oracleasm/disks/GRID03                      CACHED MEMBER       ONLINE NORMAL
           2           0 ORADATA_0000                   /dev/oracleasm/disks/DATA01                      CACHED MEMBER       ONLINE NORMAL
           2           1 ORADATA_0001                   /dev/oracleasm/disks/DATA02                      CACHED MEMBER       ONLINE NORMAL
           2           2 ORADATA_0002                   /dev/oracleasm/disks/DATA03                      CACHED MEMBER       ONLINE NORMAL
           2           3 ORADATA_0003                   /dev/oracleasm/disks/DATA04                      CACHED MEMBER       ONLINE NORMAL
           2           4 ORADATA_0004                   /dev/oracleasm/disks/DATA05                      CACHED MEMBER       ONLINE NORMAL
           2           5 ORADATA_0005                   /dev/oracleasm/disks/DATA11                      CACHED MEMBER       ONLINE NORMAL
           2           6 ORADATA_0006                   /dev/oracleasm/disks/DATA12                      CACHED MEMBER       ONLINE NORMAL
           2           7 ORADATA_0007                   /dev/oracleasm/disks/DATA13                      CACHED MEMBER       ONLINE NORMAL
           3           0 ORAFRA_0000                    /dev/oracleasm/disks/DATA06                      CACHED MEMBER       ONLINE NORMAL
           3           1 ORAFRA_0001                    /dev/oracleasm/disks/DATA07                      CACHED MEMBER       ONLINE NORMAL
           3           2 ORAFRA_0002                    /dev/oracleasm/disks/DATA08                      CACHED MEMBER       ONLINE NORMAL
18 rows selected.
From the group number and disk_number I am able to find out to which disks oracle internally stripes OCR. But little confused with the 2nd select query output . Why its having different values for NUMBER_KFFXP (253 and 255) .??
Also if oracle internally maintain mirrored copy of OCR in normal and high redundancy disk group , Why should we create a separate OCR (upto 5) on different disk groups?
How to find out the master OCR?
Thanks in advance.
Mahi

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