Fujitsu ETERNUS DX100 S4 Design Manual page 183

5. Hardware Configurations
Optional Product Installation Conditions
To use 10TB or larger Nearline SAS disks to configure RAID6-FR, the controller firmware version
•
of the ETERNUS DX must be V10L86-4000 or later, or V10L87-4000 or later (*1).
Nearline SAS disks are used to store data that does not need the access performance of SAS
•
disks. They are far more cost effective than SAS disks. It is recommended that SAS disks be
used for data that is constantly accessed or when high performance/reliability is required.
If the ambient temperature exceeds the operating environment conditions, Nearline SAS disk
•
performance may be reduced.
Nearline SAS disks can be used as Advanced Copy destinations and for the storage of archived
•
data.
When Nearline SAS disks are used as an Advanced Copy destination, delayed access responses
•
and slower copy speeds may be noticed, depending on the amount of I/O and the number of
copy sessions.
The following disks are Advanced Format (512e) disks.
•
- 2.5" Nearline SAS disks (2TB)
- 3.5" Nearline SAS disks (6TB)
3.5" Nearline SAS disks (8TB)
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3.5" Nearline SAS disks (10TB)
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3.5" Nearline SAS disks (12TB)
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- 3.5" Nearline SAS disks (14TB)
- 3.5" Nearline SAS self encrypting disks (8TB)
3.5" Nearline SAS self encrypting disks (12TB)
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When using Advanced Format (512e) disks, make sure that Advanced Format (512e) is suppor-
•
ted by the server OS and the applications. If the server OS and applications do not support Ad-
vanced Format (512e), random write performance may be reduced.
For details on the RAID levels that can be configured with Nearline SAS disks that have 6TB or
•
more, refer to
*1 : When using the controller firmware for the China region, the controller firmware version
must be V10L86-9006 or later, or V10L87-9006 or later.
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SSDs
SSDs are reliable drives with high performance. SSDs are used to store high performance databases
and other frequently accessed data.
Flash memory as a storage media provides better random access performance than disks such as
SAS disks and Nearline SAS disks. Containing no motors or other moving parts, they are highly re-
sistant to impact.
The ETERNUS DX supports SSDs that have a high level wear leveling function and sufficient re-
served space. Note that if the expected total write capacity is exceeded, the frequency of errors
gradually increases, which may lead to a reduction in the write performance. The ETERNUS DX has
a function that shows the remaining capacity as a percentage (health) in proportion to the expec-
ted total write capacity.
The number of rewrites may exceed the limit within the product warranty period if SSDs are used in
a RAID1 configuration that has a high I/O access load. Using a RAID1+0, RAID5, RAID5+0, or RAID6
configuration is recommended.
The following types of SSDs are supported in the ETERNUS DX.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
"Supported RAID" (page
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