Figure 65 Compression Overview; Table 39 Deduplication/Compression Function Specifications - Fujitsu ETERNUS DX100 S4 Design Manual

3. SAN Functions
Operations Optimization (Deduplication/Compression)
●
Compression Function
This function compresses each data block and stores the data.

Figure 65 Compression Overview

Data 1
A B
A B
The following table provides the function specifications for the Deduplication/Compression.

Table 39 Deduplication/Compression Function Specifications

Model
Number of TPPs available for Deduplication/Compres-
sion settings
The maximum logical ca-
pacity that can be a dedu-
plication/compression tar-
get (*1)
Logical capacity of the DEDUP_SYS Volume (*3)
Logical capacity of the DEDUP_MAP Volume (*3)
Volume type
*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.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Business server 1
C D
Data 1 is
written
C D
Compression
Data blocks are
compressed
A B C D A B E F
Target volume for compression
When one pool has one
RAID group
When one pool has two or
more RAID groups
TPV
Standard / FTV / WSV /
SDV / SDPV / VVOL / ODX
Copyright 2023 Fujitsu Limited
A B E
Data 2 is
written
A B E
ETERNUS DX
ETERNUS DX200 S4/DX200 S3
4
Up to five times the DEDUP_SYS Volume (*2)
Up to ten times the DEDUP_SYS Volume (*2)
Expandable from 8TB (default) to 128TB (maximum)
Fixed (5,641,339MB)
¡ (*4)
´
112
Business server 2
Data 2
F
F
P3AM-7642-32ENZ0