Chapter 1 Overview
1.2 Configuration
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
29
Copyright 2011 FUJITSU LIMITED
P3AM-3042-08ENZ0
●
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
A
B
C
D
A
B
C
D
