Automated Storage Tiering
The ETERNUS DX
uses the Automated Storage Tiering function of ETERNUS SF Storage Cruiser to
automatically change data allocation during operations according to any change in status that oc-
curs. ETERNUS SF Storage Cruiser monitors data and determines the redistribution of data. The
ETERNUS DX uses the Flexible Tier function to move data in the storage system according to re-
quests from ETERNUS SF Storage Cruiser.
The Flexible Tier function automatically redistributes data in the ETERNUS DX according to access
frequency in order to optimize performance and reduce operation cost. Storage tiering (SSDs, SAS
disks, Nearline SAS disks) is performed by moving frequently accessed data to high speed drives
such as SSDs and less frequently accessed data to cost effective disks with large capacities. Data
can be moved in blocks (252MB) that are smaller than the volume capacity.
The data transfer unit differs depending on the chunk size. The following table shows the relation-
ship between the data transfer unit and the chunk size.
Table 17 Chunk Size and Data Transfer Unit
Chunk size Transfer unit
21MB 252MB
42MB 504MB
84MB 1,008MB
168MB 2,016MB
By using the Automated Storage Tiering function, installation costs can be reduced because Near-
line SAS disk, which maintain performance, can be used.
Furthermore, because data is reallocated automatically, it can reduce the workload on the adminis-
trator for designing storage performance.
Figure 24 Flexible Tier
High speed SAS disk
High s
peed SSD
Large capacity
and c
heap
Nearline SAS
disk
Work volume
Low
High
ETERNUS DX
Access frequency
Management server
ETERNUS SF
Storage Cruiser
Monitors the data access frequency
and optimizes performance
2. Basic Functions
Operations Optimization (Virtualization/Automated Storage Tiering)
49
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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