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Don Burleson Blog 







Oracle 11g release 2: Cluster Voting Disk and Cluster Registry in ASM

Oracle11g Tips by Burleson Consulting


Cluster Voting Disk and Cluster Registry in ASM

by Lutz Hartmann, Oracle ACE

It is now possible to create Quorum Disk Groups and Quorum Disk FailGroups which cannot hold any other data than OCR or Voting Disk data. It is possible to use the ALTER DISKGROUP to change a diskgroup from REGULAR to QUORUM type:

CREATE DISKGROUP diskgroup_name


{ [ QUORUM | REGULAR ][ FAILGROUP failgroup_name ]

DISK qualified_disk_clause [, qualified_disk_clause]...

} ...

[ ATTRIBUTE { 'attribute_name' = 'attribute_value' }... ];


ALTER DISKGROUP diskgroup_name


{ [ QUORUM | REGULAR ] [ FAILGROUP failgroup_name ]

DISK qualified_disk_clause [, qualified_disk_clause ]...;

The two dynamic performance views V$ASM_DISK and V$ASM_DISK_STAT have been added the new columns FAILGROUP_TYPE.

ASM in 11gR2 chooses a couple of blocks at predefined positions of every disk for the voting information. In case of a disk failure of  the actual voting disk device, ASM automatically chooses another disk to be the new voting disk.


If you like Oracle tuning, you may enjoy my new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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