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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
[ { HIGH | NORMAL | EXTERNAL } REDUNDANCY ]
{ [ QUORUM | REGULAR ][ FAILGROUP failgroup_name ]
DISK qualified_disk_clause [, qualified_disk_clause]...
} ...
[ ATTRIBUTE { 'attribute_name' = 'attribute_value' }... ];
ALTER DISKGROUP diskgroup_name
ADD
{ [ 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.
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