||Oracle Database Tips by Donald Burleson
Oracle10g Grid Computing
Chapter 5 -
Preparing Shared Storage
Oracle Disk Manager
Oracle Disk Manager (ODM) is Oracle's
innovative I/O and file management infrastructure. Oracle Disk
Manager is a very significant development in the way Oracle manages
and interfaces with the I/O activity. The ODM interface is a set of
API calls that Oracle co-developed with Veritas for incorporating
underlying volume managers and file systems. Implementation of the
ODM interface in a file system or a logical volume manager provides
many benefits, including simplified file administration, improved
file integrity, and reduced system overhead.
ODM is completely transparent from an
application/DBA perspective. It is an improvement over standard Unix
I/O. The ODM interface allows the Oracle kernel to allocate/release
disk space, manage tablespaces, and read/write disk blocks directly.
Oracle encourages customers to use file system or volume managers
that are ODM compliant.
Oracle automatically takes advantage of the ODM
interface when the underlying file system or logical volume manager
becomes ODM-enabled. A file is considered an ODM file if it is in a
file system that supports an ODM interface. ODM is also compatible
with Oracle9i and 10g. Many of the leading file system and volume
manager providers have incorporated the ODM interface in their
products. Well known examples include Veritas Database Edition
(Advanced Cluster for Oracle) and Polyserve Matrix Server. Several
ODM semantics have been included in the DAFS v1.0 protocol
specifications offered by Network Appliance Filers.
Let's take a look at some of the ODM features:
The above text is
an excerpt from:
Oracle 10g Grid & Real Application
Computing with RAC
by Mike Ault, Madhu Tumma
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