Compaq ProLiant 6500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 125

Raw Data Storage and Database Size, Selecting the Appropriate RAID Levels, each RA4000/RA4100 Array

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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 data 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. To calculate the amount of raw data storage in a PDC/O2000 cluster, determine the total amount of shared storage space available to the cluster. To do this, you need to know the following: I The number of RA4000/RA4100 Arrays in the cluster I The number and storage capacities of the physical drives installed in each RA4000/RA4100 Array Add together the planned storage capacity of all RA4000/RA4100 Arrays to calculate the total amount of raw data storage in the PDC/O2000 cluster. The maximum amount of raw data storage in an RA4000/RA4100 Array depends on the type of physical drives you install in it. For example, using 1-inch high, 9-GB drives provides a maximum storage capacity of 108 GB per RA4000/RA4100 Array (twelve 9-GB drives). Using the 1.6-inch high, 18-GB drives provides a maximum storage capacity of 144 GB per RA4000/RA4100 Array (eight 18-GB drives). 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 with your Oracle representative for further details. Selecting the Appropriate RAID Levels Many factors affect which RAID levels you select for your cluster database. These include the specific availability, performance, reliability, and recovery capabilities required from the database. Each cluster must be evaluated individually by qualified personnel.

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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 data 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.
To calculate the amount of raw data storage in a PDC/O2000 cluster,
determine the total amount of shared storage space available to the cluster. To
do this, you need to know the following:
■
The number of RA4000/RA4100 Arrays in the cluster
■
The number and storage capacities of the physical drives installed in
each RA4000/RA4100 Array
Add together the planned storage capacity of all RA4000/RA4100 Arrays to
calculate the total amount of raw data storage in the PDC/O2000 cluster. The
maximum amount of raw data storage in an RA4000/RA4100 Array depends
on the type of physical drives you install in it. For example, using 1-inch high,
9-GB drives provides a maximum storage capacity of 108 GB per
RA4000/RA4100 Array (twelve 9-GB drives). Using the 1.6-inch high, 18-GB
drives provides a maximum storage capacity of 144 GB per RA4000/RA4100
Array (eight 18-GB drives).
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 with your Oracle representative for further details.
Selecting the Appropriate RAID Levels
Many factors affect which RAID levels you select for your cluster database.
These include the specific availability, performance, reliability, and recovery
capabilities required from the database. Each cluster must be evaluated
individually by qualified personnel.