Compaq 108164-003 - ProLiant - 800 Technical Manual page 30

I/O Performance Tuning of Compaq Servers
Figure 19.
10k-II 9.1-GB drives. Cache disabled. 2k I/Os. 100 percent random access: 67 percent reads, 33
percent writes)
Figure 20. Single drive throughput comparison. These results were obtained using ServerBench
version 4.02 Copyright 1998 by ZD Inc. All rights reserved. ZD did not independently verify this test
and makes no representations or warranties as to the results of the test.
Figure 21 shows the expected increase in performance for 10K RPM drives when used in a RAID
array.
ECG044.0399
60
Read Latency - 7,200-rpm
50
Read Latency - 10k-II
40
30
20
10
0
0 500 1000
Response versus throughput for 10k and 7.2k rpm hard drives (7,200-rpm 9.1-GB versus
160
140
120
100
80
9.1 GB 10k-II
60
9.1 GB 7,200-rpm
40
12 16
Write Latency - 7,200-rpm
Write Latency - 10k-II
1500 2000 2500 3000
I/Os per Second
30-50% Performance
20 24
Number of Clients
3500 4000 4500
Gain
28 32
30