I will explain What is the Oracle ASM Cluster Filesystem (ACFS) and How to Create ACSF.
Oracle ACFS ( ASM Cluster Filesystem )
Oracle Automatic Storage Management Cluster File System (Oracle ACFS) is introduced in Oracle 11g Release 2 version. If you don’t know what is the Automatic Storage Management ( ASM ), you should read following article before this.
Oracle Automatic Storage Management ( ASM ) -1 Add Disk and Drop Disk Operations in Oracle ASM
ACFS ( ASM Cluster Filesystem )
ACFS is a Cluster file system like Local file system that you can store Application files, including executables, database trace files, database alert logs, application reports, BFILEs, configuration files, video, audio, text, images, engineering drawings, and other general-purpose application file data.
Application can use ASM Disks and storage via ACFS as if it is local disk as shown above. ACFS behaves as shared disk between Oracle RAC nodes, so it is very advantageous.
Create ACFS File System
ACFS can be created via asmcmd,asmca and Enterprise manager tool.
You can create and mount ACFS disk via asmcmd like following.
Step-1: Login asmcmd tool and create ACFS volume like following.
[grid@MehmetSalih01 .ssh]$ asmcmd ASMCMD> volcreate -G RECO -s 10000G ACFS_VOL1 ASMCMD> ASMCMD>
Step 2: List and check it if it is created or not.
ASMCMD> volinfo --all Diskgroup Name: RECO Volume Name: ACFS_VOL1 Volume Device: /dev/asm/acfs_vol1-375 State: ENABLED Size (MB): 10240000 Resize Unit (MB): 512 Redundancy: HIGH Stripe Columns: 8 Stripe Width (K): 1024 Usage: Mountpath: ASMCMD> exit [grid@MehmetSalih01 .ssh]$
Step -3: Create a file system on the ACFS volume.
[grid@MehmetSalih01 .ssh]$ [grid@MehmetSalih01 .ssh]$ [grid@MehmetSalih01 .ssh]$ /sbin/mkfs -t acfs /dev/asm/acfs_vol1-375 mkfs.acfs: version = 12.2.0.1.0 mkfs.acfs: on-disk version = 46.0 mkfs.acfs: volume = /dev/asm/acfs_vol1-375 mkfs.acfs: volume size = 10737418240000 ( 9.77 TB ) mkfs.acfs: Format complete. [grid@MehmetSalih01 .ssh]$ [grid@MehmetSalih01 .ssh]$ [grid@MehmetSalih01 .ssh]$ [grid@MehmetSalih01 .ssh]$ exit logout [root@MehmetSalih01 ~]# [root@MehmetSalih01 ~]#
Step -4: Login with root user, set ASM profile, Add and register this filesystem to CRS.
[root@MehmetSalih01 ~]# . oraenv ORACLE_SID = [root] ? +ASM1 The Oracle base has been set to /u01/app/grid [root@MehmetSalih01 ~]# [root@MehmetSalih01 ~]# mkdir /backup [root@MehmetSalih01 ~]# $ORACLE_HOME/bin/srvctl add filesystem -d /dev/asm/acfs_vol1-375 -m /backup -u grid -fstype ACFS -autostart ALWAYS [root@MehmetSalih01 ~]# [root@MehmetSalih01 ~]#
Step -5: Check mount point before start and mount this file system. ACFS does not exist now.
[root@MehmetSalih01 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbSys1
30G 22G 4.7G 84% /
tmpfs 755G 617M 754G 1% /dev/shm
/dev/sda1 488M 28M 425M 7% /boot
/dev/mapper/VGExaDb-LVDbOra1
99G 74G 21G 79% /u01
/dev/sda2 254M 24M 231M 10% /boot/efi
[root@MehmetSalih01 ~]#
ASM file system ( ACFS )
Step 6: Start filesystem and Mount it like following.
[root@MehmetSalih01 ~]#
[root@MehmetSalih01 ~]# $ORACLE_HOME/bin/srvctl start filesystem -d /dev/asm/acfs_vol1-375
[root@MehmetSalih01 ~]#
[root@MehmetSalih01 ~]#
[root@MehmetSalih01 ~]#
[root@MehmetSalih01 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VGExaDb-LVDbSys1
30G 22G 4.7G 84% /
tmpfs 755G 617M 754G 1% /dev/shm
/dev/sda1 488M 28M 425M 7% /boot
/dev/mapper/VGExaDb-LVDbOra1
99G 74G 21G 79% /u01
/dev/sda2 254M 24M 231M 10% /boot/efi
/dev/asm/acfs_vol1-375
9.8T 22G 9.8T 1% /backup
[root@MehmetSalih01 ~]#
You can create ACFS volume and ACFS disk via asmca like following.
Run asmca tool and go to create new ACFS volume like following.
Then create ACFS disk from ACFS volume like following.
Do you want to learn Oracle Database for Beginners, then Click and read the following articles.
Oracle Database Tutorials for Beginners ( Junior Oracle DBA )