Drive - Fujitsu ETERNUS DX S5 Series Design Manual

6. Hardware Configurations
Installation Conditions and Installation Rules

Drive

This section explains the installation conditions and installation rules for drives.
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Types of Drives
The ETERNUS DX supports the latest drives that have the high-speed SAS (Max. 12Gbit/s) interface.
The following drive types can be installed in the ETERNUS DX. Some drive types have a data encryption function.
SAS disks
•
Nearline SAS disks
•
• SSDs
2.5" and 3.5" drive sizes are available.
Since 2.5" drives are lighter and require less power than 3.5" drives, the total weight and power consumption
when 2.5" drives are installed is less than when the same number of 3.5" drives is installed.
When the data I/O count is compared based on the number of drives in an enclosure (2.5" drives: 24, 3.5" drives:
12), the Input Output Per Second (IOPS) performance for each enclosure in a 2.5" drive configuration is superior
to a 3.5" drive configuration since more 2.5" drives can be installed in an enclosure than 3.5" drives.
In the ETERNUS DX, the supported drives vary depending on the model. For details, refer to the ETERNUS DX
specifications in "Product Lineup" (page
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SAS Disks
SAS disks are high-performance and high-reliability disks. They are used to store high performance
databases and other frequently accessed data.
Caution
• The following disks are Advanced Format (512e) disks.
- 1.8TB SAS disks
- 2.4TB SAS disks
• When using Advanced Format (512e) disks, make sure that Advanced Format (512e) is supported
by the server OS and the applications. If the server OS and applications do not support Advanced
Format (512e), random write performance may be reduced.
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Nearline SAS Disks
Nearline SAS disks are high capacity cost effective disks for data backup and archive use. Nearline SAS disks
can store information that requires a low access rate at a reasonable speed more cost effectively than SAS
disks.
Caution
• 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.
- 3.5" Nearline SAS disks (6TB)
20).
289 Design Guide