mkfs

Purpose

Creates an Oracle ACFS file system on the AIX operating system.

Syntax and Description

mkfs -V acfs -o h /dev/null
mkfs -V acfs [-v name ] [-s size][-o options] volume_device

mkfs -V acfs -o h /dev/null displays usage text and exits.

Table 16-13 contains the options available with the AIX mkfs command.

Table 16-13 Options for the AIX mkfs command

Option Description

-V acfs

Specifies the type of file system on AIX. acfs designates the Oracle ACFS type.

-v name

Specifies the name for the file system. A name can be a maximum of 64 characters. acfsutil info fs returns the name if one was specified.

-s size

Specifies the size of the file system in 512-byte units or in units of K|M|G|T|P. Units specified are in K (kilobytes), M (megabytes), G (gigabytes), T (terabytes), or P (petabytes).

-o options

Specifies that options follow (f, h, v). Options are preceded with the -o flag and entered as a comma-delimited string. For example: -o f,v

  • f

    Specifies the force option. This action creates the file system even if there is an existing Oracle ACFS on the volume device, although only if the file system is dismounted. This option overwrites structures on the original file system. Use this option with caution.

  • h

    Displays the usage text and exits.

  • v

    Specifies verbose mode. The progress is displayed as the operation occurs.

volume_device

Specifies an Oracle ADVM device file that is to be formatted.

You can use mkfs to create the on disk structure needed for Oracle ACFS file system to be mounted. The mkfs command is the traditional Linux command used to build a file system. After mkfs runs successfully, the USAGE column in the V$ASM_VOLUME view displays ACFS. root privilege is not required. The ownership of the volume device file dictates who can run this command.

The minimum file system size is 200 MB.

The Oracle ACFS driver must be loaded for mkfs to work.

Examples

Before creating an Oracle ACFS file system, first determine which Oracle ADVM volume devices are available. You can use the ASMCMD volinfo command to display information about the volumes and volume devices.

ASMCMD [+] > volinfo -a
...
         Volume Name: VOLUME1
         Volume Device: /dev/asm/volume1-123
         State: ENABLED
...

See Managing Oracle ADVM with ASMCMD .

Next create an Oracle ACFS file system on the volume device file.

Example 16-10 Using the mkfs command

$ /usr/sbin/mkfs -V acfs /dev/asm/volume1-123