Demonstrate you on how to
secure your ADVM Volumes by creating a snapshot copy of it.
A snapshot copy is a widely used concept with Storage Vendors, where
they use it to reduce backup and recovery
time.
Snapshot Copy is the read only copy of a partition at a particular point
in time. It doesn't take much time to create the snapshot partition regardless of the size or use of the partition. Thus it gives
good amount of benefit for large sized partition.
Utility used to create acfs snapshot is acfsutil, once a snapshot is
creates a read only copy of the partition is made
and would be accessible from inside the .ACFS directory
Volume Allocation Unit (VAU) if the stripe
column is 4 and AU is 1 MB
64 MB is the size of extenet
[root@rac1 advm]#
acfsutil snap create snap_01 /advm
acfsutil snap create: Snapshot operation is complete.
[root@rac1 advm]#
cd /advm
[root@rac1 advm]#
ls -la
total 102500
drwxr-xr-x 4 oracle dba 4096 Oct
6 16:37 .
drwxr-xr-x 36 root root 4096 Oct
6 16:11 ..
-rw-r--r-- 1 oracle dba 57 Oct
6 16:30 a
drwxr-xr-x 5 root root
4096 Oct 6 15:50 .ACFS
-rw-r--r-- 1 root root
61 Oct 6 16:37 check
drwx------ 2 root root
65536 Oct 6 15:50 lost+found
-rw-r----- 1 oracle dba 104865792 Oct
6 16:21 testnew01.dbf
# cd .ACFS/snaps/snap_01
# ls -ltr
total 102420
?--------- ? ? ? ? ? lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 61 Oct
6 16:37 check
# pwd
/advm/.ACFS/snaps/snap_01
# cd /advm
[root@rac1 advm]#
ls -ltr
total 102484
drwx------ 2 root root 65536 Oct
6 15:50 lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 61 Oct
6 16:37 check
[root@rac1 advm]#
vi check
[root@rac1 advm]#
cat check
Step 1 : Checking Files
Step 2 : Before we create a snaphost
step 3 : After creating the snapshot
[root@rac1 advm]#
rm check
rm: remove regular file `check'? y
# cd .ACFS/snaps/snap_01
# ls -ltr
total 102420
?--------- ? ? ? ? ? lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 61 Oct
6 16:37 check
[root@rac1 advm snap_01]#
cp check /advm
[root@rac1 advm snap_01]#
cd /advm
[root@rac1 advm]#
ls -ltr
total 102484
drwx------ 2 root root 65536 Oct
6 15:50 lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 61 Oct
6 16:40 check
[root@rac1 advm]#
acfsutil info fs
/advm
ACFS Version: 11.2.0.1.0.0
flags: MountPoint,Available
mount time: Thu Oct
6 15:50:23 2011
volumes: 1
total size: 268435456
total free: 58609664
primary volume:
/dev/asm/tvol-200
label:
flags: Primary,Available,ADVM
on-disk version: 39.0
allocation unit: 4096
major, minor: 252, 102401
size: 268435456
free: 58609664
ADVM diskgroup ABC
ADVM resize increment:
268435456
ADVM redundancy: unprotected
ADVM stripe columns: 4
ADVM stripe width: 131072
number of snapshots: 1
snapshot space usage: 40960
/orcl
ACFS Version: 11.2.0.1.0.0
flags: MountPoint,Available
mount time: Thu Oct
6 16:11:13 2011
volumes: 1
total size: 2147483648
total free: 71909376
primary volume:
/dev/asm/orclvol-200
label:
flags: Primary,Available,ADVM
on-disk version: 39.0
allocation unit: 4096
major, minor: 252, 102402
size: 2147483648
free: 71909376
ADVM diskgroup ABC
ADVM resize increment:
268435456
ADVM redundancy: unprotected
ADVM stripe columns: 4
ADVM stripe width: 131072
number of snapshots: 1
snapshot space usage:
470855680
# ls -tlr
total 102484
drwx------ 2 root root 65536 Oct
6 15:50 lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57 Oct
6 16:30 a
-rw-r--r-- 1 root root 110 Oct
6 16:41 check
# acfsutil snap delete snap_01 /advm
acfsutil snap delete: Snapshot operation is complete.
# acfsutil snap
create snapnew /advm
acfsutil snap create: Snapshot operation is complete.
# cd /advm
# ls -tlr
total 102484
drwx------ 2 root root 65536 Oct
6 15:50 lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 110 Oct
6 16:41 check
# cd
.ACFS/snaps/snapnew
# ls -ltr
total 102420
?--------- ? ? ? ? ? lost+found
-rw-r----- 1 oracle dba 104865792
Oct 6 16:21 testnew01.dbf
-rw-r--r-- 1 oracle dba 57
Oct 6 16:30 a
-rw-r--r-- 1 root root 110 Oct
6 16:41 check
Check the video to understand it on a practical note.
- Multiple snapshot
[root@rac1 advm]# acfsutil snap create snap_01 /advm
[root@rac1 advm]# acfsutil snap create snap_02 /advm
[root@rac1 advm]# acfsutil snap create snap_03 /advm
[root@rac1 advm]# acfsutil snap create snap_04 /advm
Queries
------------------------------------------------------------------------------------------------
To identify the file system which are
allocated through the ACFS
------------------------------------------------------------------------------------------------
col FS_NAME format a15
select * from V$ASM_FILESYSTEM;
-----------------------------------------------------------------------------------------------------
To know about the mount point and
volumes allocated in the ACFS
-----------------------------------------------------------------------------------------------------
col FS_NAME format a15
col VOL_DEVICE format a15
col VOL_LABEL format a15
select * from v$asm_acfsvolumes;
----------------------------------------------------------------------------------------------------------------
TO understand more about the current
volume statistics for ACFS volumes
----------------------------------------------------------------------------------------------------------------
col VOLUME_NAME format a15
select * from V$ASM_VOLUME_STAT;
col VOLUME_NAME format a15
col USAGE format a15
col MOUNTPATH format a15
select
VOLUME_NAME,SIZE_MB,STRIPE_COLUMNS,USAGE,MOUNTPATH from v$asm_volume;
-----------------------------------------------------------------------------------------------------------------------------------
In side the ASMCMD tool, we can find
about the volumes through the below commands
-----------------------------------------------------------------------------------------------------------------------------------
volcreate
voldelete
voldisable
volenable
volinfo
volresize
volset
volstat
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