ACFS file system Mount and Dismount Operation

Before we shut down ASM instance it is important to dismount acfs file system , Once it is dismounted all open references to Oracle ASM files are removed .

If ACFS file system is active and ASM instance is forcibly shut down , acfs file system will be placed in offline error state.If any file systems are currently mounted on Oracle ADVM volume files, the SHUTDOWN ABORT command should not be used to terminate the Oracle ASM instance without first dismounting those file systems.

Steps to mount acfs file system :

Step 1 : Enable volume from asmcmd :

ASMCMD> volinfo -G data -a
Diskgroup Name: DATA

	 Volume Name: VOLUME1
	 Volume Device: /dev/asm/volume1-167
	 State: DISABLED
	 Size (MB): 3072
	 Resize Unit (MB): 32
	 Redundancy: UNPROT
	 Stripe Columns: 4
	 Stripe Width (K): 128
	 Usage: ACFS
	 Mountpath: /u01/app/acfsmounts/myacfs

We can see here it is in disabled state

ASMCMD> volenable -G data -a 
ASMCMD> volinfo -G data -a
Diskgroup Name: DATA

	 Volume Name: VOLUME1
	 Volume Device: /dev/asm/volume1-167
	 State: ENABLED
	 Size (MB): 3072
	 Resize Unit (MB): 32
	 Redundancy: UNPROT
	 Stripe Columns: 4
	 Stripe Width (K): 128
	 Usage: ACFS
	 Mountpath: /u01/app/acfsmounts/myacfs 

ASMCMD>

Step 2 : Mount it using /bin/mount :

[root@rac1 ~]# /bin/mount -t acfs /dev/asm/volume1-167 /u01/app/acfsmounts/myacfs

To unmount acfs file system :

[root@rac1 ~]# /bin/umount -t acfs /dev/asm/volume1-167 /u01/app/acfsmounts/myacfs

Stay tuned for More articles on Oracle RAC

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