Dell Acceleration Appliances for Databases - Manual (Page 77)

ASM STORAGE CONFIGURATIONS
The configurations described below are variations that may serve your particular storage needs, using
Oracle ASM and ION Accelerator.
HA Mode, One Diskgroup
One large ASM diskgroup can be created with External Redundancy, which means no mirroring is
done by ASM. Here is the basic procedure:
1. Place all ION Accelerator storage from both the HA nodes into one ASM diskgroup called
DATA.
2. Have Oracle write the OCR and Voting Disk files to DATA, which gets passed through to the
underlying LUNs on ION Accelerator.
3. The HA implementation of ION Accelerator takes care of creating the redundant copies.
Standalone Mode
In standalone mode, Oracle ASM can be used with Normal Redundancy. The procedure would use
the first two steps in HA Mode, One Diskgroup above.
A variation is to use ASM High Redundancy for the OCR and Voting files, and Normal Redundancy
for the database files. To do this,
1. Create a 1GB partition on n LUNs from each ION Accelerator node (where n is 6 divided by
the number of nodes).
2. Put those 6 partitions into an ASM diskgroup named “CRS” with High Redundancy.
3. Put all of the remaining storage into the DATA diskgroup with Normal Redundancy.
Standalone Mode: Storing OCR and Voting Files on ION Accelerator
When using ASM (not ION Accelerator HA) for redundancy, there is no requirement to store the OCR
and Voting files in ASM. During Oracle Clusterware installation, the checkbox for this can be left
clear so ASM won’t be used for these two types of files.
The basic procedure is to create a 1GB partition on the first n LUNs from each ION until there are six
total partitions (two LUNs from each of three ION Accelerator nodes, or one LUN from each of six
nodes, etc.).
During installation, Oracle Clusterware prompts for the 6 devices on which Oracle will store the OCR
and Voting Disk files. There are 6 OCR files and 5 Voting Disk files (the Voting Files are small extents
stored in the headers of the OCR files, not separate files themselves).
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