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Did you format the disks itself? If not then format and then add to diskgroup.1 person found this helpful
I hope formatting wont loose your data, if it does then take the backup.
Format the the first couple of blocks on the device in order to remove the old ASM disk label. The dd command can be used.
dd if=/dev/zero of=<device> count=4 bs=1024
Better use deinstallation tool of Oracle to Remove Oracle Software components;
Thanks Billy, your solution worked.