Configuration; Raid Level - Fujitsu Eternus DX60 User Manual

Chapter 1 Overview
>

1.2 Configuration

RoHS compliance
The ETERNUS DX60/DX80 complies with RoHS, as mandated by the Council of Europe and our
board of directors. RoHS limits the use in electric and electronic equipment of six specific chemi-
cals: lead, hexavalent chromium, mercury, cadmium, PBB (polybrominated biphenyl), and PBDE
(polybrominated diphenyl ether). In addition, lead-free soldering is used for all printed-wiring
boards.
1.2 Configuration
This chapter describes items to be noted before configuring the ETERNUS DX60/DX80 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 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)
P3AM-3042-03ENZ0 ETERNUS DX60/DX80 Disk storage system User Guide
*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.
Do
CAUTION
• 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.
23
Copyright 2009 FUJITSU LIMITED