Drive Technology - Compaq 108164-003 - ProLiant - 800 Technical Manual

I/O Performance Tuning of Compaq Servers
Figure 16. Relative sustained I/O for each number of FC arrays under different applications. These
results were obtained using Iometer version 1998.10.08, Copyright 1998 by Intel Corporation. Intel
does not endorse any Iometer results.

Drive Technology

10K RPM Drives
10K RPM drives represent a significant improvement in SCSI drive throughput and latency. The
following set of graphs illustrate the performance gains afforded by using 10K RPM drives.
10K vs. 7200 RPM drives
As the graph illustrates, 10k drives can deliver as much as a 46% improvement in per second I/O
over 7200 RPM drives. While the improvements would affect any application, the graph shows a
greater improvement for small block transfers. For large block transfers, the performance gains of
the 10K drives are masked by SCSI bus saturation.
ECG044.0399
IO/sec vs. Number of Fibre Channel Arrays
4500
4000
3500
3000
2500
2000
1500
1000
500
0
0 1 2 3
Number of Fibre Channel Arrays
2 KB OLTP WS Mix
4 5 6 7 8
Web Server Decision Support
9 10 11
28