Benefits Of Echo Copy; Considerations Of Echo Copy; Echo Copy Is Managed Through Automigration - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

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 manage-
ment 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
42 Backup Solution Design Considerations