Creating an Oracle ACFS File System

To create and verify a file system, perform the following steps:

Create an Oracle ADVM volume in a mounted disk group with the ASMCMD volcreate command.
The compatibility parameters COMPATIBLE.ASM and COMPATIBLE.ADVM must be set to 11.2 or higher for the disk group to contain an Oracle ADVM volume. To use Oracle ACFS encryption, replication, security, or tagging, the disk group on which the volume is created for the file system must have compatibility attributes for ASM and ADVM set to 11.2.0.2 or higher. See "Disk Group Compatibility Attributes".

Start ASMCMD connected to the Oracle ASM instance. You must be a user in the OSASM operating system group. See "About Privileges for Oracle ASM".

When configuring Oracle ADVM volume devices within a disk group, Oracle recommends assigning the Oracle Grid Infrastructure user and Oracle ASM administrator roles to users who have root privileges.

To create a volume:
```
ASMCMD [+] > volcreate -G data -s 10G volume1
```
When creating an Oracle ADVM volume, a volume device name is created that includes a unique Oracle ADVM persistent disk group number. The volume device file functions in the same manner as any other disk or logical volume to mount file systems or for applications to use directly.

The format of the volume name is platform-specific. For information about the syntax of the volcreate command, see "ASMCMD Volume Management Commands".

Determine the device name of the volume that was created.

You can determine the volume device name with the ASMCMD volinfo command or from the VOLUME_DEVICE column in the V$ASM_VOLUME view.

For example:

ASMCMD [+] > volinfo -G data volume1
Diskgroup Name: DATA

         Volume Name: VOLUME1
         Volume Device: /dev/asm/volume1-123
         State: ENABLED
     ... 

SQL> SELECT volume_name, volume_device FROM V$ASM_VOLUME 
     WHERE volume_name ='VOLUME1';

VOLUME_NAME        VOLUME_DEVICE
-----------------  --------------------------------------
VOLUME1            /dev/asm/volume1-123

For information about the volinfo command, see Managing Oracle ADVM with ASMCMD .

See Also:

Oracle Database Reference for information about the V$ASM_VOLUME view

Create a file system with the Oracle ACFS mkfs command.
Create a file system using an existing volume device.

For example:
```
$ /sbin/mkfs -t acfs /dev/asm/volume1-123

mkfs.acfs: version                   = 11.2.0.1.0.0
mkfs.acfs: on-disk version           = 39.0
mkfs.acfs: volume                    = /dev/asm/volume1-123
mkfs.acfs: volume size               = 10737418240
mkfs.acfs: Format complete.
```
See "mkfs" (Linux environments) or "acfsformat" (Windows). The root privilege is not required. The ownership of the volume device file dictates who can run this command.
Optionally register the file system with the acfsutil registry command.
For example:
```
$ /sbin/acfsutil registry -a /dev/asm/volume1-123 /acfsmounts/acfs1

acfsutil registry: mount point /acfsmounts/acfs1 successfully added 
  to Oracle Registry
```
See "acfsutil registry". The root or asmadmin privileges are required to modify the registry. The Windows Administrator privilege is equivalent to the root privilege on Linux.

Registering a file system is optional. After registering an Oracle ACFS file system in the cluster mount registry, the file system is mounted automatically on each cluster member listed in the registry entry during the next registry check action. This automatic process runs every 30 seconds and eliminates the requirement to manually mount the file system on each member of the cluster.

Registering an Oracle ACFS file system also causes the file system to be mounted automatically whenever Oracle Clusterware or the system is restarted.

Note:

In an Oracle Grid Infrastructure Clusterware configuration, you can run srvctl add filesystem to automount a file system; this method is required when an Oracle Database home is installed on an Oracle ACFS file system. However, that file system should not be added to the registry. For information about Server Control Utility (SRVCTL), see Oracle Real Application Clusters Administration and Deployment Guide.

For more information, see "About the Oracle ACFS Mount Registry".

Note:

Oracle ACFS registration (acfsutil registry) is not supported in an Oracle Restart (standalone) configuration, which is a single-instance (non-clustered) environment.
Mount the file system with the Oracle ACFS mount command. You can mount a file system before or after registering the file system. If the file system has been registered, you can wait for the file system to be mounted automatically.
For example:
```
# /bin/mount -t acfs /dev/asm/volume1-123 /acfsmounts/acfs1
```
See "mount" (Linux environments) or "acfsmountvol" (Windows). The root privilege is required to run the mount command and the Windows Administrator privilege is required to run the acfsmountvol command.

After the file system has been mounted, ensure that the permissions are set to allow access to the file system for the appropriate users. For example:
```
# chown -R oracle:dba /acfsmounts/acfs1
```
Create a test file in the file system.
The user that creates the test file should be a user that is intended to access the file system. This test ensures that the appropriate user can write to the file system.

For example:
```
$ echo "Oracle ACFS File System" > /acfsmounts/acfs1/myfile
```
List the contents of the test file that was created in the file system.
For example:
```
$ cat /acfsmounts/acfs1/myfile
Oracle ACFS File System
```