Quantum DXi4510, User Manual

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Quantum DXi4000 User’s Guide 265
Glossary
B
Blockpool A pool of all unique data blocks that were captured during
the data deduplication cycle. When backup jobs occur, the data
deduplication engine searches for new data entering the
DXi4000 and uses a variable length compression type algorithm
to compare this to existing data in the blockpool. Unique blocks
are added to the blockpool and all known blocks are indexed.
Byte The basic unit of computer memory which is large enough to
hold one character.
C
Compress
A process of removing fine-grained redundancy from data
prior to storing or transmitting it. The granularity may vary, but
generally compression deals with redundancy in grains of a few
bytes.
D
Data Deduplication A process of removing coarse-grained
redundancy from data prior to storing or transmitting it. The
granularity may vary, but generally data deduplication deals
with redundancy in grains of several kilobytes. When you select
Enable Data Deduplication for a NAS share, data
deduplication is running all of the time. Backup data is sent to
the DXi4000 and data deduplication is performed on data as it