1. Simplify your Job – Automatic Storage Management Angelo Session id: 40140

2. Storage Management Gap Avg. Managed Capacity per Administrator In Database Sites with >100 GB Capacity Mgmt Gap

3. DBA Storage Challenges  Databases are rapidly growing in size – DBAs have to manage thousands of data files  Decreasing windows of scheduled downtime  Storage resources involve many organizations – Database Admin – Systems Admin – Storage Admin – Network Admin  Management of database storage is increasing in complexity and cost

4. Automatic Storage Management (ASM)  Portable, high performance cluster file system  Data is spread across disks to balance load  Integrated mirroring across disks  Removes need for third- party volume manager and file system Automatic Storage Management

5. ASM – How it Works Automatic Storage Management  No volumes: just a pool of storage

6. ASM – How it Works Automatic Storage Management  No volumes: just a pool of storage  Partitions total disk space into uniform sized megabyte units

7. ASM – How it Works Automatic Storage Management  No volumes: just a pool of storage  Partitions total disk space into uniform sized megabyte units  Units assigned to a file are managed and tracked by ASM

8. ASM – How it Works Automatic Storage Management  No volumes: just a pool of storage  Partitions total disk space into uniform sized megabyte units  Units assigned to a file are managed and tracked by ASM  Online add/remove of disk with automatic rebalancing

9. ASM – How it Works Automatic Storage Management  No volumes: just a pool of storage  Partitions total disk space into uniform sized megabyte units  Units assigned to a file are managed and tracked by ASM  Online add/remove of disk with automatic rebalancing

10. Oracle ASM The Operational Stack Disks Logical Vol File System 0010 0010 0010 0010 0010 Files Tablespace Tables Disk Group Logical Vol File System Files Tablespace Tables TODAY ASM “ The best way to lower mgmt costs is to remove complexity”

11. Data Mirroring with ASM  ASM can mirror data across storage arrays  No additional logging or expensive NVRAM to recover mirrors – Database logging recovers mirrors  Designed to tolerate component failures

12. Disk Groups & Failure Groups Failure Group 1 Failure Group 2 Controller 1Controller 2 Disk Group  Storage resources organized into Disk Groups and Failure Groups  A Disk Group is a collection of disks managed as a logical unit in which ASM files are stored  Disk Groups assigned by DBAs  A Failure Group is a set of disks sharing a common resource whose failure needs to be tolerated – Redundant copies of an extent are stored in separate Failure Groups  Failure Groups assigned by DBAs or automatically by ASM

13. Where DBAs Spend Their Time Software Maintenance 6% Ongoing System Management 55% Installation 6% Others 15% Creation & Configuration 12 % Source: IOUG 2001 DBA Survey Data Loading 6%

14. ASM Functions Drill Down  Getting started  Defining a DB  Adding/deleting/migrating storage  Hot spots  Storage fragmentation

15. Traditional vs ASM - Setup 1.Determine required storage capacity 2.Install Volume Manager, File System 3.Architect data layout to avoid hot spot 4.Create logical volumes 5.Create file systems 6.Install database 7.Create database 1.Determine required storage capacity 2.Install ASM 3.Create Disk Groups 4.Install database 5.Create database

16. Traditional vs ASM – Add Disk 1.Add Disk to OS 2.Create volume(s) with Volume Manager 3.Create File System over volume 4.Figure out data to move to new disk 5.Move data to new files 6.Rename files in database 7.Re-tune I/O 1.Add Disk to OS 2.Issue the Add Disk command

17. Traditional vs ASM – Remove Disk 1.List all data that is on disk 2.Choose existing filesystem to hold data from dropped disk 3.Move data to new files 4.Rename files in database 5.Remove disk from OS 6.Re-tune I/O 1.Issue drop disk command 2.Remove the disk from OS when Oracle says it is done

18. Traditional vs ASM – Migrate Data 1.Add new disks to OS 2.Figure out new location on other disks 3.Create volume(s) with Volume Manager 4.Create new FS 5.Move data to new files 6.Rename files in database 7.Remove old disks from OS 8.Re-tune I/O 1.Add new disks to OS 2.Issue Add disk command for new disks 3.Issue Drop Disk command for old disks 4.Remove old disks from OS when Oracle says it is done

19. Traditional vs ASM – Tune I/O 1.Daily monitor I/O performance 2.Discover hot spots 3.Figure out how to remove hot spots 4.Move data to new files 5.Rename files in database 6.Verify that hot spot is gone This space intentionally left blank

20. Traditional vs ASM – Manage Space 1.Daily monitor storage utilization 2.Discover fragmentation 3.Figure out how to remove fragmentation 4.Move data to new files 5.Rename files in database 6.Verify that fragmentation is gone This space intentionally left blank

21. ASM Lowers Management Costs 7 7 6 8 6 6 5 2 2 4 00 “Best way to save costs is to remove complexity”

22. ASM Enables Consolidated Clustered Storage ASM – Clustered Pool of Storage Oracle DB Instance Oracle DB Instance Oracle DB Instance Oracle DB Instance Clustered Servers Non – RAC Databases Oracle DB Instance ASM Instance

23. ASM Improves Performance 22,648 20,418

24. ASM - Integrated with Key Storage Hardware  ASM-Lib is an Open Interface extending ASM  Vendor library for disk discovery and I/O  Efficient I/O interface  Data description allows end-to-end validation (HARD Initiative)  Several participating storage vendors and others are in the process of joining

25. ASM - Summary New capability in Oracle 10g Database  Provides a vertical integration of the file system and volume manager for Oracle database files  Spreads database files across all available storage for optimal performance and resource utilization  Enables simple and non-intrusive resource allocation and provides automatic rebalancing

26. ASM Benefits Increases the productivity of the DBA  Simplified management interface for storage resources  Eliminates manual I/O performance tuning tasks  Virtualizes the storage to a set of disk groups  Provides mainframe class performance at lower cost

27. Next Steps….  Automatic Storage Management Demo in the Oracle DEMOgrounds – Pod 5DD – Pod 5QQ  Technical Paper on ASM – The New Best Practice (room 103 at 1:00 today) – Steve Adams – IXORA – Rich Long – Oracle  Watch OTN for more details on ASM

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