As we know NORMAL redundancy means 2 copies of each block.
I have created diskgroup:
CREATE DISKGROUP FG NORMAL REDUNDANCY FAILGROUP controller1 DISK 'ORCL:DISK3' NAME disk3 FAILGROUP controller2 DISK 'ORCL:DISK4' NAME disk4;
I have cleared small number of blocks for the first time.
dd bs=1024 count=200 if=/dev/zero of=/dev/oracleasm/disks/DISK3
I have corrupted header. And I was able to repair it by kfed repair, because second copy of header (located in aus=0 bs=256) was available.
kfed repair /dev/oracleasm/disks/DISK3 ausz=4194304
And it have been repaired.
But when I've corrupted the whole disk (disk size is 1GB)
dd bs=1M count=1024 if=/dev/zero of=/dev/oracleasm/disks/DISK3
I was not able to recover disk with kfed
[oracle@node1 ~]$ kfed repair /dev/oracleasm/disks/DISK3 ausz=4194304 KFED-00320: Invalid block num1 = , num2 = , error = [endian_kfbh]
Can't I rescue disk when I have NORMAL redundancy diskgroup where other disks are healthy?