System
Unit
Functions
3-3
Hitachi Compute Rack 210H User’s Guide
RAID level feature
Depending on a RAID level, disk arrays are typically classified into six types:
RAID0 to RAID5. The system unit supports RAID0, RAID1, and RAID5 as well as
RAID6, RAID10, JBOD which are specific to the array controller. The method and
features of each RAID level are described below.
RAID0
Host
Array Controller
Data
Block 2
Block 7
Disk 2
Block 1
Block 6
Disk 1
Block 3
Block 8
Disk 3
Block 5
Block 10
Disk 5
Block 4
Block 9
Disk 4
Figure 3-1: RAID0 method
Data is striped on multiple HDDs.
Advantage:
Particularly, the throughput is improved for a large number of files.
Disadvantage:
All data is lost if one of the hard disks in the disk array fails because of no
redundancy.
Number of HDDs required: 2 (min.) to 6 (max.)
