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Oracle Tips by Burleson |
Easy Oracle Automation
Chapter 5 -
Automatic Storage Management
ASM Concepts
Adding ASM will not eliminate any existing
database functionality. ASM maintains the existing database
functionalities with file systems or raw devices, and Oracle Managed
Files (OMF) as in previous versions. In an environment with
different database versions, older versions or existing databases
can use storage with file systems or with storage on raw devices, as
they always have done in the past.
New files can be created as ASM files, while
old files are administered the traditional way. In a nutshell,
it is possible to have
a mixture of ASM
files,
ASM is responsible for file management and
prevents accidental file deletion by eliminating the file system
interface. It provides raw disk I/O performance for all files,
striping them across multiple storage arrays. It reduces the cost of
managing storage with a clustered volume manager and integrated file
system functionality.
ASM adds the reliability features found in LVM
(Logical Volume Managers) such as mirroring protection and
eliminating the purchase of third party products. Similarly in a
RAC environment, ASM eliminates the need for a Cluster LVM or
Cluster File System (CFS).
The above text is
an excerpt from:
Easy Oracle Automation
Oracle10g Automatic
Storage, Memory and Diagnostic Features
ISBN 0-9745993-6-0
by Dr. Arun Kumar R.
 |
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