2.4 Configuring Cluster Resources
In a RAC configuration only one resource group is required. This resource group is a concurrent group for the shared volume group. The following are the steps to add a concurrent resource group for a shared volume group:
First there needs to be a volume group that is shared between the nodes.
SHARED LOGICAL VOLUME MANAGER , SHARED CONCURRENT DISKS ( NO VSD )
The two instances of the same cluster database have a concurrent access on the same external disks. This is real concurrent access and not a shared one like in the VSD environment. Because several instances access at the same time the same files and data, locks have to be managed. These locks, at the CLVM layer (including memory cache), are managed by HACMP.
1) Check if the target disks are physically linked to the two machines of the cluster, and seen by both.
Type the lspv command on both machines.
Note : the hdisk number can be different, depending on the others nodes disk configurations. Use the second field of the output (PVid) of lspv to be sure you are dealing with the same physical disk from two hosts. Although hdisk inconsistency may not be a problem IBM suggests using ghost disks to ensure hdisk numbers match between the nodes. Contact IBM for further information on this topic.
2.4.1 Create volume groups to be shared concurrently on one node
# smit vg
Select "Add a Volume Group"
Type or select values in entry fields.
Add a Volume GroupType or select values in entry fields.Press Enter AFTER making all desired changes. [Entry Fields] VOLUME GROUP name [oracle_vg] Physical partition SIZE in megabytes 32 +* PHYSICAL VOLUME names [hdisk5] + Activate volume group AUTOMATICALLY no + at system restart? Volume Group MAJOR NUMBER [57] +# Create VG Concurrent Capable? yes + Auto-varyon in Concurrent Mode? no +
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