User guide

Chapter 1 Overview
> 1.2 Configuration
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
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Copyright 2010 FUJITSU LIMITED
P3AM-3042-06ENZ0
Each RAID level description is shown below.
• RAID0 (striping)
Data is split in unit of blocks and stored across multiple disks.
Figure 1.1 RAID0 concept
• RAID1 (mirroring)
RAID1 stores the same data on two duplicated disks at the same time.
If one disk fails, other disk continues operation.
Figure 1.2 RAID1 concept
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Data writing request
HDD0 HDD1
ABCD
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ABCD
Data writing request
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HDD0 HDD1