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How do I view ASM disk groups?
To see all disks, use V$ASM_DISKGROUP instead. Contains one row for every Oracle ASM file in every disk group mounted by the Oracle ASM instance. In an Oracle ASM instance, contains one row for every active Oracle ASM long running operation executing in the Oracle ASM instance.
How many disk groups are there in ASM?
In 11gR2, an ASM Instance can have up to 63 disk groups, 10,000 disks and 1 million files for each disk group. In 12c, an ASM instance can have up to 511 disk groups, the other limits are not changed.
How do I list ASM disks?
To identify the underlying physical device that the ASM disk point to, you can use the oracleasm querydisk command. The querydisk option will list the major and minor numbers that can be used to match the physical device. The following example was run on a virtual server hosting ASM and an Oracle database.
How to list files and sizes within an ASM disk group?
We can see asm files in Oracle ASM disk group without asmcmd. You can run the following query to view files and sizes in all disk groups. We are a team with over 10 years of database management and BI experience. Our Expertises: Oracle, SQL Server, PostgreSQL, MySQL, MongoDB, Elasticsearch, Kibana, Grafana.
How does Oracle Automatic Storage Management ( ASM ) work?
Oracle ASM chooses the disk on which to store the mirror copy in a different failure group than the primary copy. Failure groups are used to place mirrored copies of data so that each copy is on a disk in a different failure group. The simultaneous failure of all disks in a failure group does not result in data loss.
Can you use asmcmd to create a disk group?
You cannot use ASMCMD to create or drop disk groups or to add or drop disks in a disk group. For these operations, you must use SQL commands. Oracle Database Administrator’s Guide for general information on Automatic Storage Management.
What are the components of a disk group in Oracle?
Disk group components include disks, files, and allocation units. Files are allocated from disk groups. Any Oracle ASM file is completely contained within a single disk group.
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