The question:
Some references say quorum disk and vote disk are the same, but “quorum disk” name was used in older versions. But Oracle 19c documentation still use both the names, so I think there is a difference. Also, when to use quorum failure group and what is it? documentation says:
A quorum failure group is a special type of failure group that does
not contain user data. Quorum failure groups are used for storing
Oracle ASM metadata. A quorum failure group may also contain voting
files if those files are stored in a disk group that contains a quorum
failure group. Additionally, Oracle ASM uses a quorum failure group to
help determine if the disk group can be mounted in the event of the
loss of one or more failure groups.
Ok, but, for example, we have a Oracle Clusterware running and there is no quorum failure group configured, so it seems it can be used or not. When to use it?
The Solutions:
Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.
Method 1
The QUORUM DISK can only contain the “voting file”. But a voting file can reside in either QUORUM DISK or REGULAR DISK. And the voting file is called votedisk in the crsctl command (“Adding, Deleting, or Migrating Voting Files”).
A quorum failgroup is a failgroup with quorum disk only. So if you place the voting file in a diskgroup with 2 regular disk + 1 quorum disk, and Oracle can have 3 copy of the voting file.
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