Fujitsu ETERNUS CS800 S5, User Manual

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Data Reduction System Description
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U41840-J-Z125-7-76
Data Reduction
Data reduction is the process of reducing the amount of storage capacity required to store
your data. The ETERNUS CS800 system provides two techniques to optimize the storage
space required on your system:
●
"Data Deduplication"
●
"Compression"
Data Deduplication
The ETERNUS CS800 system reduces the amount of storage capacity required through a
data deduplication process. The term data deduplication refers to the elimination of
redundant data. Inline data flow provides streamlined deduplication that offers a maximum
combination of total system performance, manageability, and value.
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 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.
Compression
The ETERNUS CS800 system uses compression technology after duplicated 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.