Does the controlfile need to be multiplexed in ASM?

OS=Linux 5
Oracle=11gR2 RAC with ASM
We have two diskgroup (DATA, FRA), each with 6 disks. The controlfile currently resides on the DATA diskgroup. My question is, does the controlfile need to be multiplex to FRA diskgroup in case of a diskgroup failer? Typically if the database is using filesystem for storage, i would multiplex the controlfiles to 3 different filesystems.

Hi,
This thread already been answered but I'll leave a little touch.
Some time ago we used OS filesystem to store database and we placed a part of the database at each mount point (like /u01, /u02, /u03 and so on).So, we also multiplexed control file to due flexibility of recover a controlfile if any error occurs on one theses mount points.
But with ASM generally the whole database is placed on Diskgroup DATA and controlfile on DATA and FRA and if you lose your diskgroup DATA and this will not change anything in relation to high availability, because you will need to restore database to bring database up. So, If you have backup of database of course you also have backup of controlfile.
About multiplexing de REDO in other Diskgroup can make all difference. If you lose diskgroup +DATA and you have your archivelog and redo online avaliable on other diskgroup you will have a minimun or none lost of data.
I don't like multiplex controlfile on FRA, because any maintenance that involves diskgroup that have controlfile stored will cause downtime of database. So, when I multiplex controlfile I choose diskgroup that have datafiles only of that database.
Redo and Archivelog we can change they of diskgroup without downtime of database.
As FRA is a Diskgroup used to store backup and Archivelog can be exausted and it can cause downtime on database. (We must not forget we can control it)
Other point:
In some env I have seen DBAs configuring Normal Redundancy to Diskgroup (e.g DATA) that store database and External Redundancy to Diskgroup FRA (e.g FRA) due purpose of that Diskgroup. By Default DBCA place controlfile on FRA, so If by any reason asmdisk from FRA fail, the whole database will down due controlfile on that diskgroup. This is a big mistake.
*Unable To Open Database Due To Diskgroup Used To Multiplex The RedoLogs & Controlfiles & Archivelogs Got Corrupted. [ID 1382372.1]*
Regards,
Levi Pereira

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Does the controlfile need to be multiplexed in ASM?

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