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
1.2 Configuration
This chapter describes items to be noted before configuring the ETERNUS DX60/DX80/DX90
systems.
1.2.1 RAID Level
This section describes the supported RAID level and usage (RAID level selection criteria), and
RAID group configuration.
■ Supported RAID levels and mechanism
The ETERNUS DX60/DX80/DX90 supports the following RAID levels.
• RAID0 (striping)
• RAID1 (mirroring)
• RAID1+0 (striping of pairs of disks for mirroring)
• RAID5 (striping with distributed parity blocks)
• RAID5+0 (double striping with distributed parity blocks) (*1)
• RAID6 (striping with distributed double parity blocks) (*2)
*1: RAID5+0 is a RAID system in which the data on RAID5 volumes is then RAID0 striped.
*2: RAID6 ensures data safety and continues system operation in the case of a second
malfunction within a single RAID group.
CAUTION
Do
• Remember that a RAID0 configuration is not redundant. This means
that if a RAID0 disk fails, the data will not be recoverable.
Therefore, using RAID1, RAID1+0, RAID5, RAID5+0, or RAID6
configuration is recommended.
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