Consider How You Want To Copy The Backup Data To An Off-Site Location; Consider Speed And Ease Of The Restore As Well As The Backup; Single Library Vs. Multiple Libraries; Single Library - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

servers could perform LAN-free backup (see
from the LAN to the SAN.
• List your backup applications. In a heterogeneous environment, you can have multiple applications
writing to different virtual libraries on the same VLS or D2D (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
Library vs. Multiple
• How long do you want to retain the data on the VLS or D2D. (See
• How fast is your data growing. (See
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

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 (i.e., site disaster),
you can recover from your off-site copies (could be tape or could be another replicated disk backup
device). See Considerations for

Single Library vs. Multiple Libraries

The VLS and D2D 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.
Libraries.)
Considerations for Copies
Restores.
LAN-free Backups) and thus move their backup traffic
Future Data Growth.) This is critical in deciding which disk
for more details.
HP StorageWorks VLS and D2D Solutions Guide
Single
Retention Planning.)
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