How It Works; Steps Of Accelerated Deduplication - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

Hp storageworks vls and d2d solutions guide (ag306-96028, march 2010)
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Delivers fastest restore because it maintains a complete copy of the most recent backup data.
Older data can be restored faster because it is still on the VLS – there is no need to locate physical
media, load it into a drive, and perform the restore in the traditional manner.
Provides scalable deduplication performance which can be increased simply by adding nodes.
However, the multi-node VLS still maintains the manageability of a single device.
Provides maximum hardware efficiency because the virtual cartridge file system was designed to
be deduplication aware from the beginning, and data is not copied to a separate deduplication
store.

How it Works

Figure 65
illustrates the steps in the process that backup data undergoes with Accelerated
deduplication. The explanations that follow correspond with the numbers in the figure.
Figure 65 Steps of Accelerated deduplication
.
1.
On–the–fly backup analysis
deduplication. Although Accelerated deduplication uses post-processing technology, backups
are analyzed initially while the backup is running. This process has minimal performance impact.
The deduplication software uses the metadata attached by the backup application to decode the
format of the tape. The resulting "metadata" of the tape's contents is stored in a database for
later use. This database stores a "map" of the logical backup objects on the tape, with tape
format headers removed to reveal the actual data.
Figure 66
illustrates the steps in the first phase of Accelerated
HP StorageWorks VLS and D2D Solutions Guide
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