Create ACFS Filesystem Oracle 12c Linux 12.1.0.2

— Create ACFS filesystem on 12c Linux Exadata —
1. Create a volume in ASM

ASMCMD [+] > volcreate -G datac1 -s 500G ACFS_VOL
If you get like below error
ORA-15032: not all alterations performed
ORA-15479: ASM diskgroup does not support volumes
ORA-15221: ASM operation requires compatible.asm of 12.1.0.2.0 or higher (DBD ERROR: OCIStmtExecute
Check the Current Compatibility for the Diskgroup
select group_number, name,compatibility, database_compatibility from v$asm_diskgroup
GROUP_NUMBER NAME COMPATIBILITY DATABASE_COMPATIBILITY
------------ ------------------------------ ------------------------------------------------------------ ------------------------------------------------------------
1 DATAC1 12.1.0.1.0 11.2.0.2.0
2 DBFS_DG 12.1.0.0.0 11.2.0.2.0
3 RECOC1 12.1.0.1.0 11.2.0.2.0
SQL> alter diskgroup DATAC1 set attribute 'compatible.asm'='12.1.0.2.0';
Diskgroup altered.
SQL> alter diskgroup RECOC1 set attribute 'compatible.asm'='12.1.0.2.0';
Diskgroup altered.
SQL> alter diskgroup DBFS_DG set attribute 'compatible.asm'='12.1.0.2.0';
Diskgroup altered.
SQL> select group_number, name,compatibility, database_compatibility from v$asm_diskgroup;
GROUP_NUMBER NAME COMPATIBILITY DATABASE_COMPATIBILITY
------------ ------------------------------ ------------------------------------------------------------ ------------------------------------------------------------
1 DATAC1 12.1.0.2.0 11.2.0.2.0
2 DBFS_DG 12.1.0.2.0 11.2.0.2.0
3 RECOC1 12.1.0.2.0 11.2.0.2.0
Run again the volcreate command
ASMCMD [+] > volcreate -G datac1 -s 500G ACFS_VOL

2. Check the volume information

ASMCMD [+] > volinfo -G datac1 ACFS_VOL
Diskgroup Name: DATAC1
Volume Name: ACFS_VOL
Volume Device: /dev/asm/acfs_vol-45
State: ENABLED
Size (MB): 512000
Resize Unit (MB): 64
Redundancy: MIRROR
Stripe Columns: 8
Stripe Width (K): 1024
Usage:
Mountpath:
sqlplus "/as sysasm"
SELECT volume_name, volume_device FROM V$ASM_VOLUME
WHERE volume_name ='ACFS_VOL';
VOLUME_NAME
------------------------------
VOLUME_DEVICE
--------------------------------------------------------------------------------
ACFS_VOL
/dev/asm/acfs_vol-45

3. Create a file system with the Oracle ACFS mkfs command using output of above command
With root user run below command

/sbin/mkfs -t acfs /dev/asm/acfs_vol-45
mkfs.acfs: version = 12.1.0.2.0
mkfs.acfs: on-disk version = 39.0
mkfs.acfs: volume = /dev/asm/acfs_vol-45
mkfs.acfs: volume size = 536870912000 ( 500.00 GB )
mkfs.acfs: Format complete.

4. Register the file system with the acfsutil registry command.
Create a directory called ACFS

cd /
mkdir /ACFS
/sbin/acfsutil registry -a /dev/asm/acfs_vol-45 /ACFS
acfsutil registry: mount point /ACFS successfully added to Oracle Registry

Imp Note 1: Registering an Oracle ACFS file system also causes the file system to be mounted automatically whenever Oracle Clusterware or the system is restarted.
Imp Note 2: Oracle ACFS registration (acfsutil registry) is not supported in an Oracle Restart (standalone) configuration, which is a single-instance (non-clustered) environment.

5. Verify if ACFS filesystem mounted automatically

$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbSys1
30G 17G 12G 59% /
tmpfs 252G 22G 231G 9% /dev/shm
/dev/sda1 496M 54M 418M 12% /boot
/dev/mapper/VGExaDb-LVDbOra1
99G 57G 37G 61% /u01
/dev/mapper/VGExaDb-LVDbOra2
197G 68G 119G 37% /u02
/dev/mapper/VGExaDb-LVBkp1
985G 288G 648G 31% /u03
/dev/asm/acfs_vol-45 500G 1.1G 499G 1% /ACFS

As you can see from above output the ACFS filesystem moutned automatically after registration

6. If you did not register the ACFS filesystem it will not mount automatically, you can mount the ACFS filesystem manually using below command
As root user

/bin/mount -t acfs /dev/asm/acfs_vol-45 /ACFS

7. Give appropriate permissions to the filesystem required by Oracle users

chown -R oracle:dba /ACFS
su - oracle
cd /ACFS
touch abc.txt