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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.


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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