Quantum DXi4500 User Manual page 220

Glossary
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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.
Deferred Processing Data Deduplication When you select Enable
Backup Window for the NAS share, data deduplication is
disabled for a specific time period allowing better throughput
performance during this period of time. All of the backup data
is sent to the DXi4500 immediately in its raw form without data
deduplication. After the backup window is closed and data
deduplication is re-enabled, the data that was moved during
the backup windows is now deduplicated on the DXi4500. The
advantage of deferred processing data deduplication is that
backups will complete faster with system resources dedicated
for incoming backup data.
Disk A fixed set of sectors with sequential numbers starting from
zero, directly and independently accessible and mutable by
those numbers without affecting any other sector.
Filesystem An abstraction layered over storage devices (typically disks)
obscuring the physical details of the storage devices it supports
n favor of a presentation oriented at storing and organizing
files.
Host
The device or devices to which the system is connected.
Ingest The throughput performance of data writes to the system.
LSU Logical Storage Unit
Quantum DXi4500 User's Guide