HP-UX Encrypted Volume and File System Performance and Tuning

64k Block Sequential Read - 100mb File Size
5% 5%
7% 7%
6%
8%
19%
24%
27%
26%
1
IOZone Threads
CPU Utilization %
Throughput KBs -
Scale 1
Clear CPU EVFS CPU Clear read EVFS read
Figure 12 – Tuned Sequential Reads
Tuning improved EVFS sequential read throughput by about 40%, while reducing CPU utilization.
Tuned clear I/O throughput was statistically identical to default, but CPU utilization dropped by as
much as 33%.
64k Block Random Read - 100mb File Size
2%
3%
5%
4%
5%
3%
15%
20%
25% 25%
1 10 25 50 100
IOZone Threads
CPU Utilization %
Throughput KBs -
Scale1
Clear CPU EVFS CPU Clear Random Read EVFS Random Read
Figure 13 – Tuned Random Reads
Tuning improved EVFS random read throughput by about 70%, but used slightly more CPU to get the
increased level of throughput. As with sequential reads, random read throughput was identical, but
CPU utilization dropped by 3 to 4 factors.