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Oracle Tips by Burleson |
Oracle Disk I/O Tuning
Chapter 5:
Configuration of CFS or Raw Devices
Volume management involves using
physical disks or LUNS to create disk groups. These disks are
combined to create volumes with a layout or configuration
appropriate to their purpose, for example, mirroring or striping
etc. The volumes are flexible objects that can easily be extended or
modified. The volume management operations include:
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Placing the shared disks or LUNS
from the shared storage array into the Volume Manager control. When
the LUNS are placed under the VM control, they are known as VM
disks.
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Creating the Disk Groups – the
disk groups that contain the database application must be available
to all nodes in the cluster. A disk group allows disks, volumes, and
file systems that are relevant to a single database to be arranged
into a logical collection for easy administration.
-
Creating volumes with the
appropriate layout (mirror, stripe. etc.) and size from the disk
group storage pool. Volumes are flexible objects that can be
extended or modified.
-
Making file systems from the
volumes and mounting them for database use. Volumes can also be used
for database applications, in which case they are referred to as raw
devices.
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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