HP D2D HP D2D Backup System Concepts guide (EH985-90915, March 2011) - Page 42

Archiving methods, Cartridge copy

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Archiving methods Two methods are provided for archiving data to the directly attached tape storage device, these are Copy and Export. • Copy retains the data cartridge on the HP D2D Backup system and creates an exact copy onto a physical cartridge in the attached tape storage device. • Export removes the data cartridge from the library on the HP D2D Backup System once data has been successfully copied to the physical cartridge in the attached tape storage device. Each method has advantages and disadvantages, as described in more detail below. NOTE: As a general recommendation, Copy is the easier of the two options to use because it does not remove the data from the HP D2D Backup System and can be managed completely from the Web Management Interface. Only use the Export option, if you need to free up some disk space. Export (and Import) require additional steps in the backup application. Cartridge copy The backup application on the host is used to back up data to a cartridge on the library device in the HP D2D Backup System. The Web Management Interface on the HP D2D Backup System is used to Copy the cartridge from the HP D2D Backup System to the attached tape storage device, leaving the data on the HP D2D Backup System so that it is available for quick restore. Figure 16 Cartridge copy Why use the Copy functionality? Copy creates two instances of the same cartridge; one stored on the HP D2D, the other on physical tape. Logically these are the same cartridge and the backup application has no awareness that there are two copies. If data from this cartridge is required for restore, the backup application will always restore the data from the HP D2D if it is available. The physical cartridge is, therefore, an additional copy that will be required only if the HP D2D is not available. When would Copy be used? Cartridge copies are likely to be appropriate when the user wishes to use the HP D2D Backup System for all foreseeable restore processes but requires an additional offsite copy for insurance or data security purposes. This may mean that weekly, monthly and yearly cartridges are copied. Weekly and monthly physical cartridges may be rotated; the cartridges on the HP D2D Backup System are overwritten after a period of time. Yearly cartridges may be kept indefinitely. Clear 42 Tape Attach information for G1 products

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Archiving methods
Two methods are provided for archiving data to the directly attached tape storage device, these
are Copy and Export.
•
Copy
retains the data cartridge on the HP D2D Backup system and creates an exact copy
onto a physical cartridge in the attached tape storage device.
•
Export
removes the data cartridge from the library on the HP D2D Backup System once data
has been successfully copied to the physical cartridge in the attached tape storage device.
Each method has advantages and disadvantages, as described in more detail below.
NOTE:
As a general recommendation,
Copy
is the easier of the two options to use because it
does not remove the data from the HP D2D Backup System and can be managed completely from
the Web Management Interface. Only use the
Export
option, if you need to free up some disk
space.
Export
(and
Import
) require additional steps in the backup application.
Cartridge copy
The backup application on the host is used to back up data to a cartridge on the library device in
the HP D2D Backup System. The Web Management Interface on the HP D2D Backup System is
used to
Copy
the cartridge from the HP D2D Backup System to the attached tape storage device,
leaving the data on the HP D2D Backup System so that it is available for quick restore.
Figure 16 Cartridge copy
Why use the Copy functionality?
Copy
creates two instances of the same cartridge; one stored on the HP D2D, the other on physical
tape. Logically these are the same cartridge and the backup application has no awareness that
there are two copies. If data from this cartridge is required for restore, the backup application will
always restore the data from the HP D2D if it is available. The physical cartridge is, therefore, an
additional copy that will be required only if the HP D2D is not available.
When would Copy be used?
Cartridge copies are likely to be appropriate when the user wishes to use the HP D2D Backup
System for all foreseeable restore processes but requires an additional offsite copy for insurance
or data security purposes. This may mean that weekly, monthly and yearly cartridges are copied.
Weekly and monthly physical cartridges may be rotated; the cartridges on the HP D2D Backup
System are overwritten after a period of time. Yearly cartridges may be kept indefinitely. Clear
42
Tape Attach information for G1 products