Drives - Fujitsu ETERNUS DX80 S2 Overview

Chapter 4 System Configuration

4.4 Drives

4.4 Drives
The ETERNUS DX Disk storage system supports the latest drives that have the high-speed Serial Attached SCSI
(6Gbit/s) interface.
SAS disks, Nearline SAS disks, and SSDs can be installed in the ETERNUS DX Disk storage system. Some drive
types have a data encryption function.
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.
■ Drive types
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SAS disks
SAS disks are reliable disks with high performance. SAS disks are used to store high performance
databases and other frequently accessed data.
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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.
• 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.
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ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
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