HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 28

Multiple Library, Benefits of Multiple Library Systems

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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 do LUN mapping and masking 2) All hosts write to the library as a shared device. This involves copies going on during prime backup or operational time on the hosts. • Dedicated copy library for each virtual library -- This may be expensive with multiple virtual libraries. 28 Backup Solution Design Considerations

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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 do LUN mapping and masking 2) All hosts write to the library as a shared device.
This involves copies going on during prime backup or operational time on the hosts.
•
Dedicated copy library for each virtual library -- This may be expensive with multiple virtual
libraries.
28
Backup Solution Design Considerations