HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 26

Consider How you Want to Copy the Backup Data to an Off-site Location

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• List your backup applications. In a heterogeneous environment, you can have multiple applications writing to different virtual libraries on the same VLS (which is highly flexible with regard to the libraries that can be configured). This is similar to library partitioning but more flexible and easier to setup and maintain. To reduce backup administration, always use the fewest number of virtual libraries. For example, use one virtual library for each backup application. (See Single Library vs. Multiple Libraries.) • How long you want to retain the data on the VLS. (See Retention Planning.) • How fast your data is growing. (See Future Data Growth.) This is critical in deciding which disk backup technology best fits because you should choose a technology that will continue to scale in performance and capacity so that it can provide a single backup target even after several years of data growth. Consider How you Want to Copy the Backup Data to an Off-site Location Think about copying the backup data to an off-site location for site disaster protection or long-term archival. See Considerations for Copies for more details. Consider Speed and Ease of the Restore as well as the Backup If you are still within your backup retention period, you can restore the data directly from the disk backup device. If you are outside of your retention period, you can restore from your long-term retention tapes if you have created them. If your local disk backup device has been destroyed (such as a site disaster), you can recover from your off-site copies (could be tape or could be another replicated disk backup device). See Considerations for Restores. Single Library vs. Multiple Libraries The VLS configurations are highly flexible with regard to the number and types of libraries. There are two basic backup use models (single library and multiple library). The choice of which primarily depends on the architecture of the backup applications. To reduce backup administration, use the fewest number of virtual libraries. For example, use one virtual library per backup application. Single Library The single-library use model is a many-to-one configuration -- all hosts see one communal library. This is the default configuration. 26 Backup Solution Design Considerations

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•
List your backup applications. In a heterogeneous environment, you can have multiple
applications writing to different virtual libraries on the same VLS (which is highly flexible with
regard to the libraries that can be configured). This is similar to library partitioning but more
flexible and easier to setup and maintain. To reduce backup administration, always use the
fewest number of virtual libraries. For example, use one virtual library for each backup
application. (See
Single Library vs. Multiple Libraries
.)
•
How long you want to retain the data on the VLS. (See
Retention Planning
.)
•
How fast your data is growing. (See
Future Data Growth
.) This is critical in deciding which
disk backup technology best fits because you should choose a technology that will continue
to scale in performance and capacity so that it can provide a single backup target even after
several years of data growth.
Consider How you Want to Copy the Backup Data to an Off-site Location
Think about copying the backup data to an off-site location for site disaster protection or long-term
archival. See
Considerations for Copies
for more details.
Consider Speed and Ease of the Restore as well as the Backup
If you are still within your backup retention period, you can restore the data directly from the disk
backup device. If you are outside of your retention period, you can restore from your long-term
retention tapes if you have created them. If your local disk backup device has been destroyed
(such as a site disaster), you can recover from your off-site copies (could be tape or could be
another replicated disk backup device). See
Considerations for Restores
.
Single Library vs. Multiple Libraries
The VLS configurations are highly flexible with regard to the number and types of libraries. There
are two basic backup use models (single library and multiple library). The choice of which primarily
depends on the architecture of the backup applications. To reduce backup administration, use the
fewest number of virtual libraries. For example, use one virtual library per backup application.
Single Library
The single-library use model is a many-to-one configuration -- all hosts see one communal library.
This is the default configuration.
26
Backup Solution Design Considerations