ETERNUS DX60/DX80/DX90 Disk storage system User Guide - Fujitsu
ETERNUS DX60/DX80/DX90 Disk storage system User Guide - Fujitsu
ETERNUS DX60/DX80/DX90 Disk storage system User Guide - Fujitsu
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Chapter 1 Overview<br />
1.2 Configuration<br />
1.2.2 RAID Groups and Volumes<br />
■ RAID group<br />
In an <strong>ETERNUS</strong> <strong>DX60</strong>/<strong>DX80</strong>/<strong>DX90</strong> <strong>Disk</strong> <strong>storage</strong> <strong>system</strong>, you can set up the RAID groups to all<br />
use the same RAID level or a mixture of different RAID levels.<br />
Figure 1.7 Example of a RAID group<br />
Table 1.4 show the recommended number of disks that configures a RAID group.<br />
Table 1.4 Recommended number of disks per RAID group<br />
RAID level Recommended number of disks<br />
RAID1 2<br />
RAID1+0 4, 6, 8, 10<br />
RAID5 3, 4, 5, 6<br />
RAID5+0 6, 8, 10, 12<br />
RAID6 5, 6, 7<br />
■ Volume<br />
Logical disk areas in RAID groups are called volumes.<br />
A volume is the basic RAID unit, that can be recognized by the server.<br />
Figure 1.8 RAID group concept<br />
RAID Group 1 RAID Group 2<br />
• Adding more disks to a RAID group improves performance.<br />
• Use of higher capacity disks in a RAID group will increase the time<br />
required for the disk rebuild process to complete.<br />
• The more disks per RAID5, RAID5+0, or RAID6 group, the longer the<br />
period of time for data restoration from parities and rebuilding process.<br />
Volume 1<br />
Volume 2<br />
Volume 3<br />
RAID Group 1 RAID Group 2<br />
32<br />
<strong>ETERNUS</strong> <strong>DX60</strong>/<strong>DX80</strong>/<strong>DX90</strong> <strong>Disk</strong> <strong>storage</strong> <strong>system</strong> <strong>User</strong> <strong>Guide</strong><br />
Copyright 2011 FUJITSU LIMITED P3AM-3042-08ENZ0
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