● RAID1+0 (Striping of Pairs of Drives for Mirroring)
RAID1+0 combines the high I/O performance of RAID0 (striping) with the reliability of RAID1 (mirroring).
Figure 3 RAID1+0 Concept
Drive#3
Drive#7
D
D'
Drive#2
Drive#6
C
C'
Drive#1
Drive#5
B
B'
D
rive#0
Drive#4
A
A'
Striping (RAID0)
Mir
roring (RAID1)
Data writing request
A B C D
Mirroring
Mirroring
Mirroring
Mirroring
● RAID5 (Striping with Distributed Parity)
Data is divided into blocks and allocated across multiple drives together with parity information created from
the data in order to ensure the redundancy of the data.
Figure 4 RAID5 Concept
A
E
I
M
A B C D
Data writing request
B
F
J
P M, N, O, P
C
G
P I, J, K, L
N
D
P E, F, G, H
K
O
H
L
P
Create parity data
P A, B, C, D
A B DC
Drive#0 Drive#1 Drive#2 Drive#3 Drive#4
Parity for data A to D: P A, B, C, D
Parity for data E to H: P E, F, G, H
Parity for data I to L: P I, J, K, L
Parity for data M to P: P M, N, O, P
1. Function
RAID Functions
18
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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