Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/05000 for Ora - Page 91

Raw Data Storage and Database Size, For example, an MA8000/EMA12000 Storage Subsystem with six disk

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Cluster Planning 4-17 Raw Data Storage and Database Size Raw data storage is the amount of storage available before any RAID levels have been configured. It is called raw storage because RAID volumes require some overhead. The maximum size of a database stored in a RAID system will always be less than the amount of raw data storage available, except for RAID 0, where no storage overhead is required. To calculate the amount of raw data storage in a cluster, determine the total amount of shared storage space that will be available to the cluster. To do this, you need to know the following: I The number of storage subsystems in the cluster I The number and storage capacities of the physical disk drives installed in each storage subsystem Add together the planned storage capacity contained in all storage subsystems to calculate the total amount of raw data storage in the PDC/O5000. The maximum amount of raw data storage in an MA8000/EMA12000 Storage Subsystem depends on what type of disk drives you install in the subsystem. For example, an MA8000/EMA12000 Storage Subsystem with six disk enclosures and 12 9.1-GB Ultra2 disk drives per enclosure provides a maximum storage capacity of .65 TB. Using the 18.2-GB Ultra3 disk drives provides a maximum storage capacity of 1.3 TB. The amount of shared disk space required for a given database size is affected by the RAID levels you select and the overhead required for indexes, I/O buffers, and logs. Consult your Oracle representative for further details.

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Cluster Planning
4-17
Raw Data Storage and Database Size
Raw data storage is the amount of storage available before any RAID levels
have been configured. It is called raw storage because RAID volumes require
some overhead. The maximum size of a database stored in a RAID system will
always be less than the amount of raw data storage available, except for
RAID 0, where no storage overhead is required.
To calculate the amount of raw data storage in a cluster, determine the total
amount of shared storage space that will be available to the cluster. To do this,
you need to know the following:
■
The number of storage subsystems in the cluster
■
The number and storage capacities of the physical disk drives installed
in each storage subsystem
Add together the planned storage capacity contained in all storage subsystems
to calculate the total amount of raw data storage in the PDC/O5000. The
maximum amount of raw data storage in an MA8000/EMA12000 Storage
Subsystem depends on what type of disk drives you install in the subsystem.
For example, an MA8000/EMA12000 Storage Subsystem with six disk
enclosures and 12 9.1-GB Ultra2 disk drives per enclosure provides a
maximum storage capacity of .65 TB. Using the 18.2-GB Ultra3 disk drives
provides a maximum storage capacity of 1.3 TB.
The amount of shared disk space required for a given database size is affected
by the RAID levels you select and the overhead required for indexes, I/O
buffers, and logs. Consult your Oracle representative for further details.