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Oracle Tips by Burleson |
Oracle Disk I/O Tuning
Chapter 5:
Configuration of CFS or Raw Devices
Cluster Volume Management
The cluster volume manager is a
software module that virtualizes the physical storage and presents
the usable entities for the applications, such as the database at
the operating system level. It is a storage administrator layer at
the host level.
The Veritas cluster volume manager (CVM)
uses objects for storage management. The two types of objects used
by Volume Manager are physical objects and virtual objects.
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Physical objects – Volume
Manager uses two physical objects: physical disks and partitions.
Partitions are created on the physical disks (on systems that use
partitions).
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Virtual objects - Volume Manager
creates virtual objects, called volumes. Each volume records and
retrieves data from one or more physical disks. A volume is a
virtual disk device that appears to applications, databases, and
file systems as a physical disk. Volumes are also composed of other
virtual objects such as ‘sub-disks’ and ‘plexes’. These are used to
change volume configuration features such as concatenation,
mirroring, and striping. Volumes and their virtual components are
called virtual objects.
The above text is
an excerpt from:
Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle
Databases
ISBN
0-9745993-4-4
by Mike Ault
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