Oracle Automatic Storage Management (ASM) Streamlines storage management for mission-critical databases, integrating cluster volume management and automating storage configurations. The evolution from ASM's history demonstrates enhanced data mobility, reliability, and management efficiency, particularly with the introduction of flex diskgroups in version 19c. Key benefits include simplified management, default striping and mirroring, and robust support for engineered systems.

1. Oracle Automatic Storage Management (ASM)
Anil Nair
Product Manager – Oracle RAC, ASM, AC
@RACMasterPM
http://www.linkedin.com/in/anil-nair-01960b6
http://www.slideshare.net/AnilNair27/

2. The Simple Idea for addressing the complexity of storage management
ASM History 101
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Provide an integrated
cluster volume
manager
Stripe and mirror files
across disks in ASM
Disk Groups
Automatic rebalances
after storage
configuration changes
Built on the reliable
Oracle instance
architecture
I/O operations DO
NOT go through the
ASM instance!
Manages storage as a
global cluster of
shared Disk Groups
ACFS extends the
ASM management for
non-database data
ASM along with ACFS
define the Oracle
Storage Stack

3. Oracle Stack versus Other Host-based Alternatives
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ALL database files are striped and mirrored
automatically across all ASM Disks
Individual file mount points are created for each
database. Organizations may have hundreds or
even thousands of file systems and virtual
volumes to manage.
Host-based LVM/FS
ASM

4. Efficient Storage Management of Mission Critical Databases
Evolution of the Oracle Storage Stack
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Data
Mobility
9i
Database
objects
bound to
physical
storage
10g
Automation
of storage
management
ASM
11.2
ASM
Storage
Management for
Engineered
Systems
12.1
Flex ASM
Grid Infrastructure:
Integration with
Clusterware
19c
Database Oriented Storage
Management
Data
Reliability
Management
Efficiency
Time

5. Before Oracle 12c
ASM History 101
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1-1 ASM to DB Server
Shared Diskgroups
Wide file Striping

6. Oracle 12c Release 1
Eliminates the requirement for an ASM
instance on every server
• Database instances connect to any
ASM instance in the cluster
• Database instances can failover to a
secondary ASM instance
• Administrators specify the cardinality
of ASM instances (default is 3)
• Clusterware ensures ASM cardinality
is maintained
Flex ASM
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7. 12.1 Diskgroup Organization
• Diskgroups contain files striped across disks
and optionally mirrored.
• No distinction between individual databases.
• Easy to manage, but made consolidation
difficult.
Diskgroup-oriented Storage Management (12.1)
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Diskgroup
DB3 : File 1
DB2 : File 2 DB1 : File 3
DB3 : File 3
DB2 : File 1
DB1 : File 1
DB1 : File 2
DB2 : File 3
DB3 : File 2
DB2 : File 4

8. Diskgroup
Flex Diskgroup organization (19c and higher)
• New Diskgroup type: Flex Diskgroups
• Flex Diskgroups provide File Groups
• A File Group is the collection of files belonging
to individual databases or PDBs
• A File Group’s name defaults to the database
or PDB name
Database-oriented Storage Management (19c)
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File Group File Group
File 2
File 3
File 1
File 1
File 1
File 2
File 3
File 4
File 2
File 3
DB1 DB2 DB3

9. Diskgroup
Flex Diskgroup quota management
Flex Diskgroups enable
• Quota Management - limit the space
databases can allocate in a diskgroup and
thereby improve the customers’ ability to
consolidate databases into fewer DGs
• Redundancy Change – utilize lower
redundancy for less critical databases
• ASM Database Clones to easily and
dynamically create database clones
for test/dev or production databases
ASM File Group Flexibility and Availability
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File 2
File 3
File 1
File 1
File 1
File 2
File 3
File 4
File 2
File 3
DB1 DB2 DB3
Quota Group A Quota Group B
File 1
File 2
File 3
DB3
Clone

10. Extreme Availability
• Previously, Extended RAC supported
two Failure Groups
Oracle RAC on Extended Clusters
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11. Extreme Availability
• Previously, Extended RAC supported
two Failure Groups
• New Diskgroup type:
Extended Diskgroup
• Multiple FGs per site
• Support for 3 Sites
• Survive loss of Failure Group
• Survive loss of site
• Supports Exadata
• Built on Flex ASM
• Flex Diskgroups
• Supported by Oracle installer
Oracle RAC on Extended Clusters
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12. Key Benefits of Oracle ASM
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Oracle ASM greatly simplified Oracle Database Storage Management.
Implements Stripe and Mirror Everything (SAME).
Available on all platforms including Engineered Systems.
New Database-oriented Storage Management for efficient management,
data reliability and mobility.
Scrubbing capabilities by diskgroup, file or Extent.