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compression, you must create 100 TB of virtual tape capacity to hold the four weeks of backup
data. Given deduplication across the four weeks of backup versions, the amount of physical disk
required for this 100 TB of virtual tape would be significantly less.
NOTE:
Do not create too much virtual tape capacity or your backup application may be set to
prefer to use blank tapes instead of recycling older tapes. You would likely run out of disk space
because the older backups are not being recycled/overwritten and thus the disk space used by
these old backups is not freed up. As in the example above, you should create enough virtual tape
capacity to hold backups for your entire retention policy but no more.
Replication
Introduction to Replication
Deduplication can automate the off-site process and enable disaster recovery by providing site to
site deduplication-enabled replication at a lower cost. Because deduplication knows what data
has changed at a block or byte level, replication becomes more intelligent and transfers only the
changed data instead of the complete data set. This saves time and replication bandwidth, and
is one of the most attractive features that deduplication offers. Replication enables better disaster
tolerance with higher reliability but without the operational costs associated with transporting data
off-site on physical tape.
You can take control of your data at its furthest outposts and bring it to the data center in a
cost-effective way. Using replication, you can protect data anywhere.
Figure 5 Enterprise Deployment with Small and Large Remote and Branch Offices
Replication provides end-to-end management of backup data from the small remote office to the
regional site and finally into the primary data center, all controlled from the primary data center,
while providing local access to backup data as well. Note that replication is within device families
(VLS to VLS, D2D to D2D).
HP Replication Solutions
Most companies now recognize the importance of a robust backup and restore data protection
strategy, although only enterprise level users tend to invest in site disaster recovery. In most cases,
data protection is in the form of daily off-siting of physical tapes. However, even the offsiting of
Replication
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