Fujitsu ETERNUS CS800 S6, Руководство пользователя

Страница: 31 / 561

2.5 Data Reduction
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.
ETERNUS CS800 31