Multiple Library; Benefits Of Multiple Library Systems; Backup To Vls In A Simple Deployment (Vls9000-Series With Four Dedicated Libraries Shown) - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

• Multiple hosts are mixed together in one media set. Although you may be using less physical media,
this may not meet your media tracking and pooling needs.

Multiple Library

In this model, multiple hosts map to discrete libraries in a one-to-one or some-to-one configuration.
Figure 12 Backup to VLS in a Simple Deployment (VLS9000 series with Four Dedicated Libraries
Shown)
.

Benefits of Multiple Library Systems

The assignment of drives and media in this configuration is more individualized. This model is helpful
when you need to control the organization and grouping of media. Particular backup jobs go to
particular media (or pools) and no other hosts are writing to that media. Note that backup jobs can
be assigned to particular media in the shared model, also, but it's easier to group physical media in
the dedicated model because you can group media by host.
You might choose a restricted use model if:
• Your backup application won't handle SAN sharing or if your backup application's licensing is
prohibitively expensive in a shared environment. You may be able to spend less on licenses because
you can pick the hosts that you want to be visible to particular LUNs
• You have multiple backup applications. Configure one virtual library per backup application
• You have multiple SAN fabrics. Configure one virtual library per SAN
• Your backup application does not handle SAN sharing
• You have licensing concerns with your backup application. You can adjust library slots and drives
to optimize license fees
If you choose to copy to tape through the backup application, there are two basic options:
• Shared copy library – There are two scenarios: 1) You have a dedicated copy host that sees the
copy library and all of the dedicated virtual libraries. There is SAN sharing and you may have to
HP StorageWorks VLS and D2D Solutions Guide 35