Fujitsu Eternus DX80 S2 - Figure 4.5 RAID5+0 Concept

Chapter 4 System Configuration
4.1 RAID Levels
ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
Copyright 2013 FUJITSU LIMITED P3AM-4812-11ENZ0
35
● 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 4.5 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