HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 39

Copy to Physical Tape through the Backup Application, VLS Replication

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to another VLS, D2D replicates to another D2D) and removes the need to move tapes between sites. See VLS Replication. Copy to Physical Tape through the Backup Application You can migrate data from virtual media in the VLS or D2D device to physical tape media using the various tape copy/clone mechanisms that exist in enterprise backup applications. Using the data protection software to copy from virtual to physical media has the following advantages compared to any transparent migration to tape: • The virtual and physical media are separately tracked in the backup application's database, so you can have different retention times for virtual and physical media and the two pieces of media can be in different locations. This provides flexibility when restoring data; you can restore from tape or (if you have configured your system appropriately) you can restore from the virtual library because it can retain virtual media online after the physical media is sent off-site. • The tape copy process is an integrated part of the backup application. • Improved media management and utilization. You can, for example, specify which backups are copied to physical tape, so fewer tapes are used (the difference can be as much as half). • The tape library can be used for other tape backup processes. The tape library is a common resource on the SAN because it is not hidden behind the VLS or D2D. After installing the VLS or D2D device and configuring/redirecting the backups to the device, you will create tape copy/clone jobs in the backup applications to perform the migration to physical tape. Most backup applications include several copy/clone options, ranging from creating the tape copy at the same time as the backup (mirroring), scheduling a copy of all backup media to run when all the backups are expected to finish (scheduled copy), or creating the tape copy immediately after each backup completes (triggered copy). Scheduled copy is the recommended option so the copy jobs run after the backup window; otherwise, having copies and backups running at the same time results in significant performance loss. When copying virtual cartridges to physical cartridges through the backup application, the data is read from the virtual library into one of the available media servers which then writes the data back out again to the physical library. The physical tape library is independent of the virtual tape library and is entirely under the control of the backup application. This means that the virtual library type and virtual drive type and virtual cartridge size do not need to match the physical library in any way; the backup applications all perform "object copy" where they effectively backup the backup and therefore append and span copy jobs onto the physical tapes just like they would with backup jobs. HP StorageWorks VLS and D2D Solutions Guide 39

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to another VLS, D2D replicates to another D2D) and removes the need to move tapes between
sites. See
VLS Replication
.
Copy to Physical Tape through the Backup Application
You can migrate data from virtual media in the VLS or D2D device to physical tape media using the
various tape copy/clone mechanisms that exist in enterprise backup applications. Using the data
protection software to copy from virtual to physical media has the following advantages compared
to any transparent migration to tape:
•
The virtual and physical media are separately tracked in the backup application
’
s database, so
you can have different retention times for virtual and physical media and the two pieces of media
can be in different locations. This provides flexibility when restoring data; you can restore from
tape or (if you have configured your system appropriately) you can restore from the virtual library
because it can retain virtual media online after the physical media is sent off-site.
•
The tape copy process is an integrated part of the backup application.
•
Improved media management and utilization. You can, for example, specify which backups are
copied to physical tape, so fewer tapes are used (the difference can be as much as half).
•
The tape library can be used for other tape backup processes. The tape library is a common re-
source on the SAN because it is not hidden behind the VLS or D2D.
After installing the VLS or D2D device and configuring/redirecting the backups to the device, you
will create tape copy/clone jobs in the backup applications to perform the migration to physical tape.
Most backup applications include several copy/clone options, ranging from creating the tape copy
at the same time as the backup (mirroring), scheduling a copy of all backup media to run when all
the backups are expected to finish (scheduled copy), or creating the tape copy immediately after each
backup completes (triggered copy). Scheduled copy is the recommended option so the copy jobs run
after the backup window; otherwise, having copies and backups running at the same time results in
significant performance loss.
When copying virtual cartridges to physical cartridges through the backup application, the data is
read from the virtual library into one of the available media servers which then writes the data back
out again to the physical library. The physical tape library is independent of the virtual tape library
and is entirely under the control of the backup application. This means that the virtual library type
and virtual drive type and virtual cartridge size do not need to match the physical library in any way;
the backup applications all perform
“
object copy
”
where they effectively backup the backup and
therefore append and span copy jobs onto the physical tapes just like they would with backup jobs.
HP StorageWorks VLS and D2D Solutions Guide
39