 |
|
Oracle 11g R2: ASM Dynamic Volume Manager
Oracle11g Tips by Burleson Consulting
August 11, 2008 |
ASM Dynamic Volume Manager in 11gR2
by Lutz Hartmann, Oracle ACE
A new
device driver which is integrated into the Oracle Kernel called ASM
Dynamic Volume Manager (ADVM) is loaded at ASM startup and functions
as a standard I/O interface for normal file systems to utilize ASM
functionalities.
This
driver communicates with the ASM instance about ASM extent maps,
rebalancing operations and I/O failure issues.
Files
used as ASM Disks are not supported by ADVM. For example on NetApp
Filer only real disks or Netapp Devices using ISCSI, SCSI or Fibre
Channel can be used.
For
the first version of ADVM Oracle Corporation claims to support up to
64 million files per file system, and up to 64 mounts on 32 bit
systems, and 256 mounts on 64 bit systems.
ADVM
is available the SQL*PLUS via ALTER DISKGROUP statements:
SQL> ALTER
DISKGROUP my_group1 ADD VOLUME new_vol1 SIZE 15G;
SQL> ALTER
DISKGROUP my_group1 DROP VOLUME new_vol1;
SQL> ALTER
DISKGROUP my_group1 RESIZE VOLUME new_vol1 SIZE 10G;
SQL> ALTER
DISKGROUP my_group1 ENABLE VOLUME new_vol1;
SQL> ALTER
DISKGROUP ALL DISABLE VOLUME ALL;
SQL> ALTER
DISKGROUP my_group1 MODIFY VOLUME new_vol1 USAGE 'ofs';
ADVM
is also integrated with new commands for the asmcmd interface.
volcreate
voldelete
voldisable
volenable
volinfo
volresize
volset
The
new diskgroup attribute COMPATIBLE.ADVM must be set
11.2 as well as COMPATIBLE.ASM to add a new volume.
 |
If you like Oracle tuning, you may enjoy my new book "Oracle
Tuning: The Definitive Reference", over 900 pages
of BC's favorite tuning tips & scripts.
You can buy it direct from the publisher for 30%-off and get
instant access to the code depot of Oracle tuning scripts. |
|
