San Functions; Operations Optimization (Deduplication/Compression); Deduplication/Compression; Figure 66 Deduplication/Compression Overview - Fujitsu ETERNUS DX500 S4/DX600 S4 Design Manual

3.

SAN Functions

This chapter describes the functions that are available when a SAN connection is used.

Operations Optimization (Deduplication/Compression)

The Deduplication/Compression function cannot be used if the Unified kit/Unified License is installed.

Deduplication/Compression

The Deduplication/Compression function analyzes duplicated data in every 4KB of the write data from the server,
and writes the duplicated data only once. After the first write, the data is referenced instead of writing the same
data again. This reduces the total write size. Also, with the Compression function further data reduction is realiz-
ed.
The Deduplication/Compression function can not only perform both deduplication and compression at the same
time, but can also perform only deduplication or compression individually.
Overviews of the Deduplication/Compression function, the Deduplication function, and the Compression function
are described below.
●
Deduplication/Compression Function
This function removes duplicate data blocks, compresses the remaining data blocks, and then stores the data.

Figure 66 Deduplication/Compression Overview

Data 1
A B
A B
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
Business server 1
C D
Data 1 is
written
C D Analysis
Deduplication
Duplicate data blocks are removed
Compression:
Data blocks are compressed
A B C D E F
Target volume for deduplication/compression
Copyright 2019 FUJITSU LIMITED
A B E
Data 2 is
written
A B E
ETERNUS DX
112
Business server 2
Data 2
F
F
P3AM-7722-25ENZ0