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CP 3100 Operation Archiving and Migrating

Archiving and Migrating

By default the CP 3100 copies (archives) data from a virtual cartridge to a physical tape. This

ensures that there is a permanent form of storage for your data. After an archive is complete, the

data in the virtual cartridge remains on the hard drive. This enables restore operations to be per

formed quickly, at disk speed.

A Migrate action occurs when the CP 3100 needs to free space on the hard drive to store more data

onto a virtual cartridge. A Least Recently Used algorithm determines which virtual cartridge data to

remove from the hard drive. In this way, the CP 3100 can store data continually and never become

“full.” Data does not migrate until the CP 3100 needs to do so.

You may want some data to remain stored on the hard drive for a longer period of time. You can use

the Do Not Archive and Do Not Migrate options to hold data within an individual virtual car

tridge as long as desired. You can also prevent any virtual cartridge data from being removed from

the CP 3100, though this is not recommended.

As discussed under “Viewing Device Properties” on page 59, you can automatically archive data to

a physical tape always or choose to never perform an archive from any virtual cartridge. The same

choices are available for Migrate. There is a consequence for choosing Do Not Archive or Do

Not Migrate.

• If you choose Do Not Archive to never perform an archive, your data will never be perma-

nently stored on a removable medium that you can safely store away. In addition, the

3100 hard drive(s) will eventually become full and you will not be able to store data onto

the CP

3100. Consequently, you will not be able to perform backups.

• If you choose to archive but choose Do Not Migrate to never migrate, you can store your

data onto physical tapes; however, the CP 3100 hard drive(s) will eventually become full and

you will not be able to store data onto the CP 3100. Therefore, you will not be able to per

form backups.

To ensure that certain data is stored permanently on the CP 3100, choose the appropriate option

with a particular virtual cartridge. The section

“Configuring a Virtual Tape Cartridge” on page 64

describes the options to archive/not archive and migrate/not migrate a particular virtual cartridge.

Checking the Do Not Migrate box allows data in the virtual cartridge to be archived to physical

tape, but ensures that the data stays on the CP 3100 hard drive until you decide it is time to migrate

the data (see

“Manually Performing a Migrate Operation” on page 67). You must still ensure that

the host backup software does not overwrite the data on the virtual cartridge by performing erase,

tape labeling, or backup operations to the virtual cartridge.

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Quantum DPA Betriebsanweisung Seite 98