Compaq 3000 manual Diagram of a RAID 5 Write

Chapter 2. RAID Array Controller

Figure 2–9 Diagram of a RAID 5 Write

Host Data

1101 0111

0110 1110

1011 0001

0010 0110

Controller divides the

data into chunksized units

and calculates parity

	1101	0111	Striped data and parity
	0110	1110
			written to the array
	1011	0001
XOr	0010	0110
Parity =
	0010

There is still data left

so the Controller

repeats the Process

	1011	0111	Striped data	and parity
	0110	1110
			written to the array
XOr	1011	0001
	0010	0110
Parity =
		1110

SHR-1058

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.

EK–SMCPQ–UG. C01 2–15