HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 27

Benefits of Single Library Systems

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Figure 11 Backup to VLS in a Simple Deployment (VLS9000-series with One Shared Library Shown) Benefits of Single Library Systems • This use model is easy to manage. • It is easy to copy through the backup application because you already have shared devices and they all see and are seen by a copy engine or server. • Some configuration tasks are easier; you don't, for example, have to worry about assigning specific jobs to specific libraries. • You don't have to worry about performance tuning. If, for example, you have enough bandwidth for ten backup streams, you configure ten drives and let the device load balance automatically. The backup application decides how to allocate; you don't have to specify. • Multiple hosts are mixed together in one media set. When you copy to tape, you're using less media. • With the VLS9000 or VLS Gateway, you can consolidate your storage system to use only one large VLS (greater than 500 usable TB) instead of multiple smaller appliances. If you use Data Protector, licensing is relatively economical - media servers do not require individual licenses, object copy doesn't require additional licensing, and virtual tape is licensed per TB. Setup is largely automated and does not require manual intervention. Considerations for Single Library Systems • Not all backup applications are well-suited to this setup. This depends (at least in part) on the application's licensing schemes. If you have to purchase shared drive licenses, this model may be more expensive than a dedicated setup. • Setup can be challenging in some applications. You may have to configure paths to the tape drives from all the backup hosts. The backup application may do some of this automatically, but this, in itself, can be time consuming. And if you change the configuration, you may have to repeat some management steps and do some re-configuration. • 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. Single Library vs. Multiple Libraries 27

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Figure 11 Backup to VLS in a Simple Deployment (VLS9000–series with One Shared Library Shown)
Benefits of Single Library Systems
•
This use model is easy to manage.
•
It is easy to copy through the backup application because you already have shared devices
and they all see and are seen by a copy engine or server.
•
Some configuration tasks are easier; you don’t, for example, have to worry about assigning
specific jobs to specific libraries.
•
You don’t have to worry about performance tuning. If, for example, you have enough
bandwidth for ten backup streams, you configure ten drives and let the device load balance
automatically. The backup application decides how to allocate; you don’t have to specify.
•
Multiple hosts are mixed together in one media set. When you copy to tape, you’re using less
media.
•
With the VLS9000 or VLS Gateway, you can consolidate your storage system to use only one
large VLS (greater than 500 usable TB) instead of multiple smaller appliances.
If you use Data Protector, licensing is relatively economical — media servers do not require individual
licenses, object copy doesn’t require additional licensing, and virtual tape is licensed per TB. Setup
is largely automated and does not require manual intervention.
Considerations for Single Library Systems
•
Not all backup applications are well-suited to this setup. This depends (at least in part) on the
application’s licensing schemes. If you have to purchase shared drive licenses, this model may
be more expensive than a dedicated setup.
•
Setup can be challenging in some applications. You may have to configure paths to the tape
drives from all the backup hosts. The backup application may do some of this automatically,
but this, in itself, can be time consuming. And if you change the configuration, you may have
to repeat some management steps and do some re-configuration.
•
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.
Single Library vs. Multiple Libraries
27