Hp D2D100 Backup System Manual de usuario descargar pdf (Pagina 85)

Step 2

Use HP D2D Web

Management Interface to

copy to tape drive.

Physical

Tape Drive

Cartridge

Step 1

Use backup application on

host to write to cartridge.

HP StorageWorks D2D Backup System

Autoloader

HP StorageWorks D2D Backup System

Autoloader

Figure 36 C a rtridge copy

WhyusetheCopyfunctionality?

Copy creates two instances of the same c artridge; one stored on the HP D2 D, 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 car tridge is required for restore, the backup application will a lways 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 labeling of the cartridges in this case is

essential because the backup application may overwrite the ca r tridge on the HP D2D Backup System

and, therefore, lose any knowledge of the existence of the physical tape cartridge.

When

is it necessary to restore from a copied cartridge?

Ther

e are three situations where it may be necessary to restore from the copied cartridge:

• The cartridge stored in the autoloader device on the HP D2D is overwritten (acc identally) by the

backup application. The ba ckup application database is updated to reﬂect the new contents of

the cartridge and all knowledge of the old data is lost. If the backup administrator becomes

awa

re that this has happened, it is possible to import the physical cartridge back into the HP D2D

sys

tem, from where its data can be "imported" back into the application database for restore, if

required. In this case, because the backup application has overwritten the database entry for the

cartridge, some external knowledge of what is on the copied cartridge is required in order to be

able to decide whether the data on the copied ca rtridge is useful.

• Th

ewholeHPD2DBackupSystemoracompleteautoloaderontheHPD2Disaccidentally

removed from the Web Management interface. The physical copy of the cartridge is the only

copy now in existence. The backup application is still aware of the car tridge’s existence because

it was not aware of the loss of the D2D system. The backup administrator h as two options; if there

is no required restore at this point, the administrator can deploy a new HP D2D system or create

new autoloader on the existing D2D and then import any copied cartridges back into the new

D2D Backup System

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