Data deduplication is especially powerful when it is applied to backup, since most backup data sets have a
great deal of redundancy. The amount of redundancy will depend on the type of data being backed up, the
backup methodology and the length of time the data is retained.
Example. Backing up a large customer database that gets updated with new orders throughout the day.
With the typical backup application you would normally have to back up, and store the entire database.
Even incremental backups will result in storing the full database to disk once again, taking up increasing
amounts of disk space with almost identical backup data sets. With block-level deduplication, you can
backup the same database to the device on two successive nights and, due to its ability to identify
redundant blocks, only the blocks that have changed will be stored. All the redundant data will have
pointers established.
The HP approach to deduplication
HP StoreOnce deduplication software simplifies the deployment of deduplication technology across IT
infrastructures. With explosive data growth driving IT sprawl, deduplication technology is quickly
becoming a requirement for many customers to help reduce the capacity required to store information.
Traditional deduplication technologies tend to approach the problem from a fragmented perspective and
this results in multiple deduplication methodologies being deployed adding to the management
complexity of the infrastructure. HP StoreOnce is different; as a next generation deduplication
architecture, it is not sold as standalone software, but rather is a portable engine that can be consistently
embedded in multiple products, eliminating the complexity of first generation deduplication. HP
StoreOnce uses patented algorithms and features designed by HP Labs to maximize backup and restore
performance while minimizing management and hardware overhead.
HP StoreOnce deduplication software is not sold as standalone software but designed to be portable, it
can be embedded in multiple products. All HP StoreOnce Backup systems including systemHP B6000 and
HP Data Protector 6.2.1 include the HP StoreOnce deduplication engine.
Most StoreOnce customers using the earlier HP Dynamic deduplication technology can upgrade their
firmware to improve performance and enable replication to newer systems based on HP StoreOnce.
NOTE:
The HP VLS product family uses deduplication based on object-level data deduplication for
increased performance in large scale Fibre Channel deployments. These deduplication technologies are
not compatible; they use different technologies and cannot be used together.
For more information on HP StoreOnce deduplication refer to the white papers available on
http://www.hp.com/go/d2d
What deduplication ratio can I expect?
The actual data deduplication ratio you can expect will depend on a number of factors including: the type
of data, the backup methodology used, and the length of time you retain your data. However, assuming
standard business data mix and extended on disk retention (periods of more than 12 weeks) you could
expect to see:
20:1 capacity ratio assuming a weekly full and daily incremental backup model
Is there likely to be any impact on performance?
The graphic below aims to illustrate that the actual performance achieved using a StoreOnce Backup
system is dependent upon a number of factors including data set type, compression levels, number of
data streams, number of devices emulated and number of concurrent tasks, such as backup and
deduplication, housekeeping, and replication. In general, the more process steps, the longer it may take.
QuickSpecs
HP StoreOnce Backup systems
Features and Benefits
DA - 13218 Worldwide — Version 18 — September 28, 2012
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