HP Integrity rx4640 Server - Manual (Page 82)

Drive Arrays and Fault Tolerance
S1
S2
S3
S4
B1
B3
P5,6
P3,4
P1,2
P7,8 B7
B2
B5
B8
B4
B6
Figure D-7: Distributed data guarding, showing parity
information (Px,y)
Advantages
•
•
•
•
•
High read performance
No loss of data if one physical drive fails
More drive capacity usable than with RAID 1+0—parity information requires
only the storage space equivalent to one physical drive
Disadvantages
Relatively low write performance
Loss of data if a second drive fails before data from the first failed drive is rebuilt
D-8 HP Smart Array 5300 Controller User Guide
HP CONFIDENTIAL
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