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
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
driver communicates with the ASM instance about ASM extent maps,
rebalancing operations and I/O failure issues.
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.
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.
is available the SQL*PLUS via ALTER DISKGROUP statements:
DISKGROUP my_group1 ADD VOLUME new_vol1 SIZE 15G;
DISKGROUP my_group1 DROP VOLUME new_vol1;
DISKGROUP my_group1 RESIZE VOLUME new_vol1 SIZE 10G;
DISKGROUP my_group1 ENABLE VOLUME new_vol1;
DISKGROUP ALL DISABLE VOLUME ALL;
DISKGROUP my_group1 MODIFY VOLUME new_vol1 USAGE 'ofs';
is also integrated with new commands for the asmcmd interface.
new diskgroup attribute COMPATIBLE.ADVM must be set
11.2 as well as COMPATIBLE.ASM to add a new volume.
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