Figure 66 Details Of The Deduplication/Compression Function - Fujitsu ETERNUS DX100 S4 Design Manual

3. SAN Functions
Operations Optimization (Deduplication/Compression)
To use the Deduplication/Compression function, the controller firmware version of the ETER-
•
NUS DX must be V10L88-8000 or later (*1).
Releasing all the unused areas may take some time because the area release process releases
•
the areas one by one after the command is issued or after the optimization is executed.
The area release operation may result in an incomplete release of the physically allocated
•
areas depending on the storage system status, on the I/O load, or on whether the data in the
released area is duplicated.
The deduplication rate may temporarily decrease due to a CM failure, a firmware update, or a
•
blackout.
If a failure occurs in a RAID group configuring the TPP, or a bad sector occurs in the DED-
•
UP_SYS Volume or the DEDUP_MAP Volume, the data of all the Deduplication/Compression
Volumes in the TPP may be deleted.
*1 : When using the controller firmware for the China region, the controller firmware version
must be V10L88-9008 or later.
●
Functional Details

Figure 66 Details of the Deduplication/Compression Function

Server
A A
B B
C E
D F
I/O request
Deduplication/
Compression
Volume
(a virtual volume
that can be seen
from the server)
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
Maps the Deduplication/
A A
Compression Volume
B
B
(or the virtual volume)
C E
and the actual written data
F
D
DEDUP_MAP0 DEDUP_MAP1
(TPV)
Non-Deduplication/
Compression
Volume
Copyright 2023 Fujitsu Limited
Thin Provisioning Pool (TPP)
DEDUP_SYS (TPV)
A
B
(TPV)
C
D
Actual written data after
deduplication/compression
117
ETERNUS DX
E
F
P3AM-7642-32ENZ0