Fujitsu Eternus DX60 User Manual

Also see for ETERNUS DX60: User guide User guide Configuration guide Operation guide Setup guide

Contents

Chapter 1 Overview> 1.2 ConfigurationETERNUS DX60/DX80/DX90 Disk storage system User Guide26 Copyright 2010 FUJITSU LIMITEDP3AM-3042-06ENZ01.2 ConfigurationThis chapter describes items to be noted before configuring the ETERNUS DX60/DX80/DX90systems.1.2.1 RAID LevelThis section describes the supported RAID level and usage (RAID level selection criteria), andRAID group configuration.■ Supported RAID levels and mechanismThe 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 secondmalfunction within a single RAID group.CAUTION Do• Remember that a RAID0 configuration is not redundant. This meansthat if a RAID0 disk fails, the data will not be recoverable.Therefore, using RAID1, RAID1+0, RAID5, RAID5+0, or RAID6configuration is recommended.