Oracle ACFS Mount Points and Storage Space

This topic describes the Oracle ASM Cluster file system (ACFS) mount points for Oracle Database Appliance.

If you select Oracle Automatic Storage Management (Oracle ASM) for database storage when you create a database, then an Oracle ASM Cluster file system (ACFS) is not created. All files are in an Oracle ASM diskgroup.

If you select Oracle ACFS for database storage, then each database has its own Oracle ACFS mount point:

• DATA diskgroup: /u02/app/oracleuser/oradata/db_name

• RECO diskgroup: /u03/app/oracleuser.

With Oracle ACFS, the following are created:

• A 100G ACFS is created from +DATA diskgroup for each database. This Oracle ACFS automatically extends the space on demand.

• A common Oracle ACFS with 25% of +RECO diskgroup is created with auto extension on. This file system is used for fast recovery area and redo logs for all databases.

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Table B-1 Oracle ACFS Mount Points and Related Oracle ASM Disk Groups and Volume Information

File System	Oracle ASM Disk Group	Oracle ASM Dynamic Volume	Mount Point
DATA	+DATA	/dev/asm/datdbname-nnn For example: /dev/asm/datodacn-123	/u02/app/oracleuser/oradata/dbname For example: /u02/app/example/oradata/odacn
RECO	+RECO	/dev/asm/reco-nn	/u03/app/oracleuser This mount point is shared by all databases for fast_recovery_area and redo logs. For fast_recovery_area, the path is: /u03/app/oracleuser/fast_recovery_area/db_name For redo logs, the path is: /u03/app/oracleuser/redo/db_name

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Example B-1 Oracle ACFS Storage Space

When the Oracle ACFS file systems are created, they do not initially consume all of the storage in the appliance. Space is preserved for additional repositories, or in some cases, database files stored directly in Oracle ASM. You can check for available storage space in your file systems by running the operating system command df -k as shown in the following example.

# df -k 
Filesystem                            1K-blocks   Used         Available  Use%   Mounted on 
/dev/mapper/VolGroupSys-LogVolRoot    30963708    14203568     15187276   49%     / 
tmpfs                                 65952292      647800     65304492    1%     /dev/shm 
/dev/sda1                               495844       43872       426372   10%     /boot 
/dev/mapper/VolGroupSys-LogVolOpt     61927420    18594420     40187272   32%     /opt 
/dev/mapper/VolGroupSys-LogVolU01    103212320    49621560     48347880   51%     /u01 
/dev/asm/reco-62                      76546048     1469676     75076372    2%     /u03/app/oracle
/dev/asm/datrdb2-268                 104857600     3872368    100985232    4%     /u02/app/oracle/oradata/rdb2
/dev/asm/datndb11-268                104857600      247160    104610440    1%     /u02/app/oracle/oradata/ndb11
/dev/asm/datndb12-268                104857600      247160    104610440    1%     /u02/app/oracle/oradata/ndb12