The following table provides the function specifications for the Deduplication/Compression.
Table 9 Deduplication/Compression Function Specifications
Model ETERNUS AF250 S2/AF250
Number of TPPs available for Deduplication/Compression set-
tings
4
The maximum logical capacity
that can be a deduplication/
compression target (*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) 8TB (default) to 128TB (maximum)
Logical capacity of the DEDUP_MAP Volume (*3) Fixed (5,641,339MB)
Volume type TPV
¡
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 Volume according
to the total capacity of the Deduplication/Compression Volumes. If the efficiency of the Deduplication/
Compression function cannot be estimated, the recommended total capacity of Deduplication/Compression
Volumes is a capacity smaller than the logical capacity 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 deduplication/compression is not ef-
fective, a write operation to the Deduplication/Compression Volume may fail due to a capacity shortage of
the DEDUP_SYS Volume.
In addition, if the DEDUP_SYS Volume capacity runs out or is close to running out, an SNMP Trap is sent.
● Performance When Using the Deduplication/Compression Function
The ETERNUS AF performs data deduplication/compression in synchronization with the I/O from the server.
•
Using this function in environments where random access occurs is recommended. Data is intermittently stor-
ed in Deduplication/Compression Volumes because data is appended.
•
I/O response may significantly degrade when compared to systems that do not use the Deduplication/
Compression function.
•
Using this function in environments where the I/O size is 32KB or smaller is recommended. The performance is
affected in environments where the I/O size is large because data is deduplicated and compressed every 4KB.
•
If the I/O size or the boundaries of the I/O address are not 4KB, the performance is affected because the parts
less than 4KB are read in the ETERNUS AF.
•
If I/Os are issued to the Deduplication/Compression Volumes, the CPU usage rate increases. The performance
of non-Deduplication/Compression Volumes may also be affected.
1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
40
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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