- Oracle 11g Release 2 introduced the Oracle Grid Infrastructure installation.
- Prior to 11g R2, Oracle Automatic Storage Management (ASM) software was automatically installed when you installed the Oracle database software.
- Since 11g R2, if you you need to use Oracle ASM you need first to install the Oracle Grid Infrastructure Software.
 | In a single instance database environment |
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- A New method of installing Automatic Storage Management (ASM) with Oracle 11g R2:
- In a cluster configuration: Oracle ASM shares an Oracle home with Oracle Clusterware
- In a single instance datbase configuration: Oracle ASM shares an Oracle home with Oracle Restart.
- To upgrade an existing Oracle ASM installation:
- Upgrade Oracle ASM by running an OGI upgrade
| For a clustered environment |
- An Oracle Grid Infrastructure installation includes:
- Oracle Clusterware
- Oracle Automatic Storage Management (ASM), and
- the Listener
| About Oracle ASM: |
- Oracle ASM is a volume manager and file system.
- Like other volume managers, Oracle ASM group disks into one or more disk groups.
- While the administrator manages the disk groups, these operate like black boxes and the placement of datafiles within each disk group is automatically managed by Oracle.
- Separation between database and ASM administration:
- Oracle ASM administration requires SYSASM privilege.
- Besides creating a division of responsibilities between ASM and Database administration, this also helpt to prevent that different databases using the same storage accidentally overwrite each others files.
- Starting in Oracle 11g R2, Oracle ASM can also store Oracle Cluster Registry and voting disks files.
- Oracle ASM Cluster File System (ACFS) is a new file system and storage management design that extentds Oracle ASM technology to support data that cannot be stroed in Oracle ASM (both in single instance and cluster configurations).
- ACFS is installed with Oracle Grid Infrastructure.
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