HP D2D .HP D2D Backup System user guide (EH985-90907, March 2011) - Page 182

Virtual Tape Devices are backup targets on the HP StoreOnce Backup System

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Tape rotation strategies Virtual Tape Devices However, in order to ensure a high level of data integrity, the disks use RAID protection. This reduces the available capacity but ensures that, in the event of a disk failure in the device, there will be no data loss. Actual storage capacity is approximately: • HP D2D2502: 1.5 TB; HP D2D2504: 3 TB • HP D2D4106: 4.5 TB, or 9 TB, if an extra shelf is installed • HP D2D4112: 9 TB, or 18 TB, if an extra shelf is installed • HP D2D4312: 9 TB, up to a maximum of 36 TB with three extra shelves installed • HP D2D4324: 18 TB, up to a maximum of 72 TB with three extra shelves installed Tape rotation strategies determine when backups are run, the number of cartridges that are required and how they are reused. Virtual Tape Library targets on an HP StoreOnce Backup System can easily be incorporated into most tape rotation strategies. If your organization does not yet have a tape rotation strategy in place, see the HP StoreOnce Backup System Concepts Guide for example configurations. Virtual Tape Devices are backup targets on the HP StoreOnce Backup System to which the backup application on the hosts write data. They appear to the host as network-attached or locally-attached physical tape library or autoloader, but physically, they use disk space on the HP StoreOnce Backup System which, as in tape terminology, is referred to as slots or cartridges. 182 Glossary

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However, in order to ensure a high level of data integrity, the disks use RAID
protection. This reduces the available capacity but ensures that, in the event of
a disk failure in the device, there will be no data loss.
Actual storage capacity is approximately:
•
HP D2D2502: 1.5 TB; HP D2D2504: 3 TB
•
HP D2D4106: 4.5 TB, or 9 TB, if an extra shelf is installed
•
HP D2D4112: 9 TB, or 18 TB, if an extra shelf is installed
•
HP D2D4312: 9 TB, up to a maximum of 36 TB with three extra shelves in-
stalled
•
HP D2D4324: 18 TB, up to a maximum of 72 TB with three extra shelves
installed
Tape rotation
strategies
Tape rotation strategies determine when backups are run, the number of cartridges
that are required and how they are reused. Virtual Tape Library targets on an
HP StoreOnce Backup System can easily be incorporated into most tape rotation
strategies. If your organization does not yet have a tape rotation strategy in
place, see the
HP StoreOnce Backup System Concepts Guide
for example
configurations.
Virtual Tape
Devices
Virtual Tape Devices are backup targets on the HP StoreOnce Backup System
to which the backup application on the hosts write data. They appear to the host
as network-attached or locally-attached physical tape library or autoloader, but
physically, they use disk space on the HP StoreOnce Backup System which, as
in tape terminology, is referred to as slots or cartridges.
Glossary
182