Fujitsu ETERNUS CS800, User Manual

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2.5 Data Reduction
2.5 Data Reduction
Data reduction is the process of reducing the amount of storage capacity required to store
your data. The ETERNUS CS800 systems provide two techniques to optimize the storage
space required on your system:
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"Data Deduplication" on page 34
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"Compression" on page 34
2.5.1 Data Deduplication
The ETERNUS CS800 system disk backup and replication systems use Fujitsu Technology
Solutions patented data deduplication technology to dramatically increase the role that disk
can play in data protection. With ETERNUS CS800 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. Fujitsu’s innovative implementation of
this core technology means that users do not have to compromise on performance to take
advantage of extended retention capability. Inline data flow provides streamlined
deduplication that offers a maximum combination of total system performance,
manageability, and value.
Fujitsu'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 ETERNUS CS800 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.
2.5.2 Compression
The ETERNUS CS800 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.
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