High Reliability - Fujitsu ETERNUS DX80 S2 Overview

Chapter 1 Overview
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Model upgrade
As a support for system scalability after installation, an ETERNUS DX Disk storage system can be upgraded
to a higher-end model. The ETERNUS DX80 S2 can be upgraded to the ETERNUS DX90 S2. The ETERNUS
DX80 S2/DX90 S2 can be upgraded to the ETERNUS DX410 S2/DX440 S2.
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High reliability

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RAID levels
The ETERNUS DX Disk storage system supports RAID5+0 that is superior to RAID5 in reliability and
performance, and RAID6 that responds to the double failure of disks, as well as RAID1, RAID1+0, and
RAID5.
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Redundant configurations
Important components are duplicated to maintain high fault tolerance. This allows hot swapping of failed
components without interrupting operations.
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Data protection against power failure
Since data is saved from the cache memory to the non-volatile memory in the controller when a power
failure occurs, data can be retained indefinitely.
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Data integrity
The ETERNUS DX Disk storage system adds check codes to all data that is saved. The data is verified at
multiple checkpoints on transmission paths to ensure data integrity.
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Monitoring for signs of failure
When a possible sign of drive failure is detected, the data of the suspect drive is restored to the hot spare
and the suspect drive is switched while maintaining data redundancy.
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Data Encryption
The ETERNUS DX Disk storage system has the ability to encrypt data as it is being written. Encryption with
firmware is supported by default. Together with the world standard 128bit AES method (*4), Fujitsu's own
high performance encryption method is also supported.
In addition, Self Encrypting Drives (SEDs) are available. Since each drive performs self encryption instead
of the firmware, loads that are usually caused by encryption using firmware are removed and data can be
encrypted without reducing performance. SEDs use the 256bit AES method. An SED authentication key can
be stored in the ETERNUS DX Disk storage system and the key server.
*4: Advanced Encryption Standard: Federal Information Processing Standards method
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ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
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