HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 34

Benefits of Echo Copy, Considerations of Echo Copy

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Figure 14 Echo Copy is Managed through Automigration Benefits of Echo Copy • The destination library is not visible to the backup application, so it does not need licensing. • There is no need to license/configure copy jobs in the backup application. • Copy traffic is no longer routed through the SAN. • Maximizes performance of high-speed tape drives by freeing bandwidth during the normal backup window. • All destination tapes created by echo copy are in the native tape format, so they can be restored directly from any tape drive or library that is visible to the backup application. Considerations of Echo Copy • The destination library can only be used for copy operations. • The copy is a full tape copy, rather than an incremental change copy, so it can be an inefficient use of media if you are using non-appending media pools in your backup jobs. • The backup application will not be aware of any copy failures. • Echo copy can only use the tape libraries supported by the VLS firmware (for example, HP MSL, EML, ESL-E libraries). • Because echo copy automatically links the virtual and physical tapes (to maintain media management with enterprise backup applications), human error is a factor to keep in mind. With linked media management, any mistakes with the destination library's media will also affect the virtual cartridges. For example, if new tapes are not loaded into the destination library the new, matching virtual tapes will not be created. Subsequent backups will fail because the virtual tapes present are protected. 34 Backup Solution Design Considerations

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Figure 14 Echo Copy is Managed through Automigration
Benefits of Echo Copy
•
The destination library is not visible to the backup application, so it does not need licensing.
•
There is no need to license/configure copy jobs in the backup application.
•
Copy traffic is no longer routed through the SAN.
•
Maximizes performance of high-speed tape drives by freeing bandwidth during the normal
backup window.
•
All destination tapes created by echo copy are in the native tape format, so they can be
restored directly from any tape drive or library that is visible to the backup application.
Considerations of Echo Copy
•
The destination library can only be used for copy operations.
•
The copy is a full tape copy, rather than an incremental change copy, so it can be an inefficient
use of media if you are using non-appending media pools in your backup jobs.
•
The backup application will not be aware of any copy failures.
•
Echo copy can only use the tape libraries supported by the VLS firmware (for example, HP
MSL, EML, ESL-E libraries).
•
Because echo copy automatically links the virtual and physical tapes (to maintain media
management with enterprise backup applications), human error is a factor to keep in mind.
With linked media management, any mistakes with the destination library's media will also
affect the virtual cartridges. For example, if new tapes are not loaded into the destination
library the new, matching virtual tapes will not be created. Subsequent backups will fail
because the virtual tapes present are protected.
34
Backup Solution Design Considerations