Quantum DXi4701, User Manual

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Chapter 1: DXi4701 System Description
Data Reduction
Quantum DXi4701 User’s Guide 9
• Compression
Data Deduplication
The DXi-Series disk backup and replication systems use Quantum’s
patented data deduplication technology to dramatically increase the
role that disk can play in data protection. With DXi-Series solutions,
users can retain 10 to 50 times more backup data on fast recovery disk
than with conventional arrays. This advantage allows IT departments to
cost-effectively retain months of backup data on disk for faster, more
reliable restores and more data recovery points. Quantum’s innovative
implementation of this core technology means that users do not have to
compromise on performance to take advantage of extended retention
capability. The new, inline data flow in the DXi 2.x Software provides
streamlined deduplication that offers a maximum combination of total
system performance, manageability, and value.
Quantum's deduplication technology uses a sub-file, variable-length
approach to identify redundant blocks in a data stream—blocks that
have appeared before in the same dataset or in datasets processed at an
earlier time. When a block appears that has already been stored, the DXi
system inserts a reference pointer to the earlier instance of the data
segment instead of storing another copy. The result is a dramatic
reduction in the storage capacity needed to store the data set, and a
similar reduction in the bandwidth needed to replicate deduplicated
data sets over a network. For more information on enabling data
deduplication, see NAS Summary on page 204.
Compression
The DXi4701 systems use compression technology after duplicate blocks
have been identified and replaced as part of the deduplication process.
With compression, unique data that has been through the data
deduplication process can be compressed at a typical ratio of
approximately 2:1. This enables you to maximize the storage capacity of
your system.