NORMAL Redundancy diskgroup shift the voting file to another available disk if existing voting file
In NORMAL redundancy diskgroup there can be maximum 3 voting files disks except QUORUM disk.
So if there additional disk(s) are available in diskgroup which is not currently holding the voting file,
then if any disk holding voting file, goes offline due to I/O issue or getting dropped then then the voting file will shift to the available disk(s).
Below are the 2 cases I simulated to demonstrate this test
Case 1: when dropping a disk holding voting file
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SQL> select GROUP_NUMBER,NAME,STATE,TYPE from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TYPE
------------ ------------------------------ ----------- ------
3 OCRVOTE1 MOUNTED NORMAL
2