● Compression Function
This function compresses each data block and stores the data.
Figure 65 Compression Overview
A B C D A B E F
Business server 2
Target volume for compression
A B C D
Data 1
Business server 1
Data 2
A B E F
Data 1 is
written
Data 2 is
written
Compression
Data blocks are
compressed
ETERNUS DX
A B E FA B C D
The following table provides the function specifications for the Deduplication/Compression.
Table 39 Deduplication/Compression Function Specifications
Model ETERNUS DX200 S4/DX200 S3
Number of TPPs available for Deduplication/Compres-
sion settings
4
The maximum logical ca-
pacity that can be a dedu-
plication/compression tar-
get (*1)
When one pool has one
RAID group
Up to five times the DEDUP_SYS Volume (*2)
When one pool has two or
more RAID groups
Up to ten times the DEDUP_SYS Volume (*2)
Logical capacity of the DEDUP_SYS Volume (*3) Expandable from 8TB (default) to 128TB (maximum)
Logical capacity of the DEDUP_MAP Volume (*3) Fixed (5,641,339MB)
Volume type TPV ¡ (*4)
Standard / FTV / WSV /
SDV / SDPV / VVOL / ODX
´
*1 : To perform an efficient load balance of the Deduplication/Compression process, configuring
two or more RAID groups per pool is recommended.
*2: If a Deduplication/Compression Volume is created or expanded, expand the DEDUP_SYS Vol-
ume according to the total capacity of the Deduplication/Compression Volumes. If the effi-
ciency of the Deduplication/Compression function cannot be estimated, the recommended
total capacity of Deduplication/Compression Volumes is a capacity smaller than the logical ca-
pacity of the DEDUP_SYS Volume.
*3: The Deduplication/Compression function can create Deduplication/Compression Volumes
whose capacity is equal to or larger than a DEDUP_SYS Volume. In environments where dedu-
plication/compression is not effective, a write operation to the Deduplication/Compression
Volume may fail due to a capacity shortage of the DEDUP_SYS Volume.
3. SAN Functions
Operations Optimization (Deduplication/Compression)
112
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Design Guide (Basic)
Copyright 2023 Fujitsu Limited
P3AM-7642-32ENZ0
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