Compaq 108164-003 - ProLiant - 800 Technical Manual page 25

I/O Performance Tuning of Compaq Servers
Figure 10. Relative maximum throughput for SCSI and Fibre Channel storage systems. These
results were obtained using Iometer version 1998.10.08, Copyright 1998 by Intel Corporation. Intel
does not endorse any Iometer results.
Distance vs. Performance
The following graphs illustrate the impact of latency over long distances. The throughput of the 2
x 10km cable system quickly becomes limited by the latency introduced by the extended loop. In
situations where remote storage is required, the performance implications should be taken into
consideration.
Figure 11. Relative performance of FC-AL systems for common workstation loads. 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 Application: Maximum MB/sec
(1 MB, 100% Read, 0% Write, 100% Sequential, 0% Random)
45
40
35
30
25
20
15
10
5
0
RAID 0
Fibre Channel Array
Simulated Workload: WS Mix
(4 KB, 50% Read, 50% Write, 50% Sequential, 50% Random)
1600
1400
1200
1000
800
600
400
200
0
1 2
Number of Fibre Channel Arrays
5 Meter Cable
RAID 1 RAID 5
RAID Level
SMART-2DH
3 4
10 Kilometer Cable 2 x 10 Kilometer Cables
RAID 5 No Cache
5 6
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