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Oracle Tips by Burleson |
Oracle10g Grid Computing
with RAC
Chapter 5 -
Preparing Shared Storage
Volume Management
The database is constructed and maintained on
file system files or raw partitions, which are entities at the
operating system level. They are directly attached to storage
devices, NAS devices, or SAN volumes. There are several different
layers of abstraction between the physical disks and the objects
that the database uses. The physical drive is at the lowest level,
next comes the LUNS (logical unit numbers) of manageable sizes
employing an appropriate RAID level. LUNS are presented to the host
system as physical objects.
The Logical Volume Manager (LVM), a software
module running at the host level, manages the physical objects and
presents them as logical units that the application can use. The
volume manager hides the physical attributes of the disks or LUNs by
introducing virtualization. The volume manager can also execute the
RAID operations if needed. Within the volume manager, storage
devices are grouped into disk groups (e.g., Veritas disk group).
Within a disk group, we can create a logical
volume with an optional or desired RAID level. Finally, the logical
volume is either presented as a file system after mounting, or
presented as a raw partition for application use. The VM tool
provides a very flexible way of managing the volumes and file
systems. Without a volume manager, LUNS are physical disks with
partitions.
The above text is
an excerpt from:
Oracle 10g Grid & Real Application
Clusters
Oracle 10g
Grid
Computing with RAC
ISBN 0-9744355-4-6
by Mike Ault, Madhu Tumma
Oracle Consulting
Services
Burleson
Oracle Consulting offers Senior Oracle consultants which are available for all
areas of Oracle support. Common Oracle consulting support activities include
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consulting, Oracle design reviews and
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for your Oracle DBA
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Installation
of Oracle application packages
For more
information, please visit
www.dba-oracle.com or email
info@remote-dba.net.
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