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ASM(Automatic Storage Management)

As the database size grows into terabytes, space management becomes very complex task, space management becomes a challenge.
To overcome the space management challenges most of the customers used to depend on third party
volume managers like veritas volume manager, Tivoli volume manager etc....

Generally, we dont create a LUN(Logical Unit) using a single disk. We create a LUN by using multiple disks so that data will be striped equally among all the disks.
If the data is striped, I/O contentions will be minimized and the application gives better performance.

ASM = FileSystem/Cluster FileSystem + Volume Manager + RAID(Redundant Array of Inexpensive Disks).

ASM was introduced in 10g version of Oracle. ASM is free of cost either with Standard Edition or Enterprise Edition.
ASM can also act as Cluster filesystem, volume manager and it also supports RAID concepts.
In 10g, ASM binaries are integrated with oracle binaries.

10g & 11gR1 : Oracle Software = ASM + Oracle binaries.
In 11gR2, ASM binaries are separated from database binaries and shipped along with cluster ware binaries, together we call it as Grid Infrastructure Services.
11gR1 : Oracle Software = oracle binaries.
Grid Infrastructure Services = ASM binaries + Cluster ware binaries.
Cluster ware binaries are meant for RAC.

Once we invoke the runInstaller of GIS, we get the following options :
1.Install GIS for standalone
2.Install GIS for Cluster
Oracle has introduced ASM to eliminate third party cluster file systems and volume managers in managing terabyte database environments.
ASM is the foundation for RAC. The prerequisit for RAC is, database should be in shared storage.

ASM supports RAID concepts like RAID0 and RAID1.
RAID0 is nothing but striping and RAID1 is nothing but mirroring.
ASM does not support RAID5.
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