User guide

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
• RAID5+0 (double striping with distributed parity)
Multiple RAID5 volumes are RAID0 striped. For large capacity configurations, use of
RAID5+0 instead of RAID5 results in enhanced performance, improved reliability, and shorter
rebuilding times.
Figure 1.5 RAID5+0 concept
Striping with
distributed parity
(RAID5)
Striping (RAID0)
A
E
B
I
F
P
A, B
P M, N
C
G
H
P
C, D
P O, P
HDD0 HDD1 HDD2 HDD3 HDD4 HDD5
D
K
P K, L
Striping (RAID0)
Striping with
distributed parity
(RAID5)
J
L
M
N
O
P
P E, F
P I, J
P G, H
RAID5 RAID5
A B
Create parity data
D
Create parity data
C
Data writing request
A
B
C
D
ABCD
A B C D