Compaq 108164-003 - ProLiant - 800 Technical Manual page 27

I/O Performance Tuning of Compaq Servers
Figure 14. Relative performance of FC-AL systems for decision support applications. These results
were obtained using Iometer version 1998.10.08, Copyright 1998 by Intel Corporation. Intel does not
endorse any Iometer results.
I/O performance vs. Number of FC Arrays
The following graphs provide some insight into the performance gains associated with
distributing the Fibre Channel storage load across multiple FC Arrays. As you can see from
Figure 15 and Figure 16, performance increases across all applications with the addition of more
storage arrays.
Figure 15. Sustained I/O rates for Fibre Channel systems as a function of the number of attached
FC arrays. These results were obtained using Iometer version 1998.10.08, Copyright 1998 by Intel
Corporation. Intel does not endorse any Iometer results.
ECG044.0399
Simulated Workload: Decision Support
(25% Access, 8 KB, 0% Read, 100% Write, 100% Sequential, 0% Random
75% Access, 8 KB, 100% Read, 0% Write, 80% Sequential 20% Random)
900
800
700
600
500
400
300
200
100
0
1 2
Number of Fibre Channel Arrays
5 Meter Cable
IO/sec vs Number of Fibre Channel Arrays
(512 B, 100% Read, 0% Write, 100% Sequential, 0% Random)
18000
16000
14000
12000
10000
8000
6000
4000
2000
0
0 1 2 3
Number of Fibre Channel Arrays
3 4
10 Kilometer Cable 2 x 10 Kilometer Cables
4 5 6 7
5 6
8 9 10 11
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