Disadvantages Of Copy; Cartridge Export - HP StorageWorks D2D - Backup Systems User Manual

• The whole HP D2D Backup System or a complete library on the HP D2D is accidentally 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 cartridge's existence because it was not
aware of the loss of the D2D system. The backup administrator has two options; if there is no re-
quired restore at this point, the administrator can deploy a new HP D2D system or create a new
library on the existing D2D and then import any copied cartridges back into the new device for
use with restores at a later date. If a restore is urgently required, the administrator can put the
copied cartridge into a physical tape drive attached to the host and restore directly from that. In
either case, the backup application is aware of the cartridge's existence.
• Both the D2D system and the host are lost. In this case, the physical cartridge copy (as long as it
was a full system backup) can be used for disaster recovery onto new or repaired server hardware
using a tape device attached to the host server.

Disadvantages of Copy

1. Data is left on the HP D2D Backup System; no disk space is freed by copying to physical cartridge.
2. It is possible for the backup application to overwrite the cartridge on the HP D2D Backup System
and thus become unaware of the data that has been copied to the physical cartridge.

Cartridge export

The backup application on the host is used to back up data to a slot on the library device (or to a
standalone tape drive device) in the HP D2D Backup System. It is also used to move the data from
the slot into the mail slot. This creates an empty slot where the data was moved.
The Web Management interface on the HP D2D is used to Export cartridge data from the mail slot
on the HP D2D Backup System to the attached tape storage device. After a successful export, the data
is removed from the HP D2D Backup System and the mail slot becomes empty. (If the export fails, the
data remains in the mail slot.) Export removes the data and frees up disk space on the HP D2D Backup
System and is useful for long term archival (for example in a yearly tape in a rotation scheme). If
restore is needed, data can be imported (or moved back) into the HP D2D Backup System. Export is
not recommended with deduplicating libraries as it does very little to free up disk space, which is the
prime reason for export. (Space is only freed up, if a chunk of data is no longer referenced by any
cartridges.)
CAUTION:
Do not export cartridges that the backup application uses on a frequent basis as part of a rotation
strategy because it will not be able to write to the empty slot.
150 Using Tape Attach