ORA-15087: disk ‘string’ is formatted as an ext2/ext3 or OCFS2 file system

Problem:
ORA-15087: disk ‘string’ is formatted as an ext2/ext3 or OCFS2 file system

Document:
Cannot See ASM Disks From Asmca when using udev rules on rhel 6 (Doc ID 1911888.1)

SOLUTION
Clear the header by writing 25 MB of null, after clearing the header ASMCA and KFOD can able to see the devices
For example:

# dd if=/dev/zero of= bs=1M count=25

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