Voting Quorum failgroup or regular failgroup files location?

About the notion of quorum failgroup ORACLE writes:
QUORUM of discs, or in groups of lack of quorum, cannot contain all database files,
(OCR) Oracle Cluster registry, or dynamic volumes. However, the QUORUM disks
can contain the file with voting for synchronization of Cluster Services (CSS). Oracle ASM
whenever files disk quorum uses or groups failed quorum for the vote
possible.

To sum up, I think that is the difference between a regular failgroup and a quorum quorum failgroup failgroup can only contain files of voice and an ordinary one can contains several types of files.
So I don't see any advantage to place files with right to vote on a quorum failgroup on a regular. Why Oracle has introduced the notion of quorum failgroup?
Thanks in advance.

Why Oracle has introduced the notion of quorum failgroup?

You must configure an odd number of disks with right to vote because the vote of the files are concerned, a node must be able to access more than half of the files with the right to vote at any time (simple majority). In order to be able to tolerate failure of n files in vote, need at least 2n + 1 configured. (n = number of files with voting rights) for the cluster.

If you lose 1/2 or more of all your disks with right to vote, then nodes get evicted from the cluster, or nodes to expel from the cluster.

For this reason when using Oracle for the redundancy of your discs with voting rights, Oracle recommends that customers use disks of 3 or more voting.

If you use only a 1 H/W storage and it is fail. Together the cluster falls down including all the voting disk is not serious the number configured.

The problem in an extended cluster configuration (Extended RAC) is that most of the facilities use only two storage systems (one on each site), which means that the site that hosts the majority of voting records is a potential single point of failure for the entire cluster. If the storage or the site where the files of n + 1 vote is configured fails, the entire cluster will go down, because Oracle Clusterware will lose the majority of the files.

To avoid a complete cluster failure, Oracle will support a third vote file on a cheap lowend, standard NFS mounted device somewhere in the network. Oracle recommends the file NFS vote on a dedicated server, which belongs to a production environment.

Thus, you will create a file on NFS "cooked leader" (as a disk) and present to the DSO. From this point of ASM does not know that ASMDISK between the network (wan) and it's a "cooked" file

Then, you must mark this ASMDISK as QUORUM, because Oracle will use this ASMDISK only to store the VOTEDISK. This will prevent him causing problem perfomance or dataloss store data (such as data files).

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