ASM Dynamic Volume Manager (DVM) & ACFS

The ASM Dynamic Volume Manager (DVM) is a kernel-loadable device driver that provides a standard device driver interface to clients (for example, ACFS).

after read about DVM & ACFS on 11gR2 Feature, that made my curious. so create testing... ACFS:

start to create Files using "dd":

$ dd if=/dev/zero of=/oracle/asmdisks/_file_disk5 bs=1k count=10000000

10000000+0 records in

10000000+0 records out

10240000000 bytes (10 GB) copied, 303.029 seconds, 33.8 MB/s

Associate Loop Device with the New File:

# losetup /dev/loop5 /oracle/asmdisks/_file_disk5

Create Disk on ASMLib:

# oracleasm createdisk VOL5 /dev/loop5

Create ASM Disk Group with ASM Compatibility "11.2" by "asmca":

$ asmca

create asm Disk Group "DISK03" and then create Volume "asm_vol1" from "DISK03" Disk Group:

and then create ASM Cluster File System(ACFS):

create directory for mount point ,check... and mount:

$ mkdir -p /oracle/product/acfsmounts/disk03_asm_vol1

# ls /dev/asm/asm_vol1*

/dev/asm/asm_vol1-15

# mount -t acfs /dev/asm/asm_vol1-15 /oracle/product/acfsmounts/disk03_asm_vol1

# df

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/asm/asm_vol1-15 5242880 47512 5195368 1% /oracle/product/acfsmounts/disk03_asm_vol1

# cd /oracle/product/acfsmounts/disk03_asm_vol1

# touch file.txt

ASMCMD> volstat

DISKGROUP NUMBER / NAME: 3 / DISK03

---------------------------------------

VOLUME_NAME

READS BYTES_READ READ_TIME READ_ERRS

WRITES BYTES_WRITTEN WRITE_TIME WRITE_ERRS

-------------------------------------------------------------

ASM_VOL1

274 271360 1 0

2936 11739136 263 0

ASMCMD> volinfo -G DISK03 ASM_VOL1

Diskgroup Name: DISK03

Volume Name: ASM_VOL1

Volume Device: /dev/asm/asm_vol1-15

State: ENABLED

Size (MB): 5120

Resize Unit (MB): 256

Redundancy: UNPROT

Stripe Columns: 4

Stripe Width (K): 128

Usage: ACFS

Mountpath: /oracle/product/acfsmounts/disk03_asm_vol1