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Chapter 2. RAID Array Controller
EK–SMCPQ–UG. C01 2–15
Figure 2–9 Diagram of a RAID 5 Write
1101
0110
1011
0010
0111
1110
0001
0110
Host Data
Controller divides the
data into chunksized units
and calculates parity
There is still data left
so the Controller
repeats the Process
1101
1011
0111
0111
0110
0110
1110
1110
1011
1011
0001
0001
0010
0010
0110
0110
Striped data and parity
written to the array
Striped data
written to the array
S
HR-1
0
5
8
0010
1110
XOr
XOr
Parity =
Parity =
and parity
RAID 5 handles drive failures in the same manner as RAID 4, except the parity
is different for each stripe. The controller either uses the parity information on a
stripe to reconstruct its data or simply reads the data as normal, depending on the
location of the stripe’s parity drive.