HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 33

Benefits of Copying to Physical Tape through the Backup Application

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after the backup window is complete, all of the media servers that were performing LAN backups are now idle and can be used for copies. Do not use media servers that are performing LAN-free backup because these will be active application servers and could affect application performance if used for copy operations. Ensure that the media servers used for tape copies are plugged into the same SAN switch as the virtual library and physical library so the copy traffic does not use any SAN bandwidth. In this configuration, the tape copy does not impact the running application servers, so it can be run in the background after the backups are completed. Benefits of Copying to Physical Tape through the Backup Application Using a dedicated media server to migrate data stored on a VLS to a physical library allows you to: • Use the functionality of a backup application. • Copy only the specific files you need onto physical tape. • Not waste tape storage as physical tapes can be fully filled. • Monitor and track copy jobs from the backup application. • Use any tape library that is supported by the backup application. Considerations for Copying to Physical Tape through the Backup Application There are potential drawbacks to using a backup application instead of caching to copy data on the VLS to physical tape. Consider the following when deciding which data migration method to use: • You must purchase additional backup application licenses for the physical library. • You must configure a backup application with a scheduled copy job to perform the migration. • If you have the media servers on different SAN switches from the libraries, copy bandwidth is added to the SAN during data migration. Copy to Tape using VLS Automigration You can migrate data from virtual media in the VLS device to physical tape media using automigration/tape-offload to perform transparent tape migration. The automigration echo copy feature allows the VLS to act as a tape copy engine that transfers data from virtual cartridges on disk to a physical tape library connected to the VLS device. See "Automigration" (page 79). Echo copy essentially acts as a transparent disk cache to the physical library so echo copy jobs can be performed at times other than the peak backup window. Once automigration is set up, echo copy operations are automatic and seamless to the user. Echo copy is managed through the automigration software on the VLS instead of through the backup application. Considerations for Copies 33

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after the backup window is complete, all of the media servers that were performing LAN backups
are now idle and can be used for copies. Do not use media servers that are performing LAN-free
backup because these will be active application servers and could affect application performance
if used for copy operations. Ensure that the media servers used for tape copies are plugged into
the same SAN switch as the virtual library and physical library so the copy traffic does not use
any SAN bandwidth. In this configuration, the tape copy does not impact the running application
servers, so it can be run in the background after the backups are completed.
Benefits of Copying to Physical Tape through the Backup Application
Using a dedicated media server to migrate data stored on a VLS to a physical library allows you
to:
•
Use the functionality of a backup application.
•
Copy only the specific files you need onto physical tape.
•
Not waste tape storage as physical tapes can be fully filled.
•
Monitor and track copy jobs from the backup application.
•
Use any tape library that is supported by the backup application.
Considerations for Copying to Physical Tape through the Backup Application
There are potential drawbacks to using a backup application instead of caching to copy data on
the VLS to physical tape. Consider the following when deciding which data migration method to
use:
•
You must purchase additional backup application licenses for the physical library.
•
You must configure a backup application with a scheduled copy job to perform the migration.
•
If you have the media servers on different SAN switches from the libraries, copy bandwidth
is added to the SAN during data migration.
Copy to Tape using VLS Automigration
You can migrate data from virtual media in the VLS device to physical tape media using
automigration/tape-offload to perform transparent tape migration. The automigration echo copy
feature allows the VLS to act as a tape copy engine that transfers data from virtual cartridges on
disk to a physical tape library connected to the VLS device. See
“Automigration” (page 79)
.
Echo copy essentially acts as a transparent disk cache to the physical library so echo copy jobs
can be performed at times other than the peak backup window. Once automigration is set up,
echo copy operations are automatic and seamless to the user. Echo copy is managed through the
automigration software on the VLS instead of through the backup application.
Considerations for Copies
33