HP-UX Encrypted Volume and File System Performance and Tuning

64k Block Random Write - 100mb File Size
2%
4%
6% 6% 6%
4%
13%
19%
25%
24%
1 10 25 50 100
IOZone Threads
CPU Utilization %
Throughput KBs -
Scale20
Clear CPU EVFS CPU Clear Random Write EVFS Random Write
Figure 22: Random Writes VxFS Tuning 5% dbc_max
For random writes the buffer cache exhaustion effect occurs after 25 threads, where throughput
performance drops off significantly.
Read performance with buffer cache set to 5% is dramatically different than the write results above.
For reads – where buffer cache is not utilized – there is effectively no change from the test results
achieved with buffer cache set to 5-50%. Note that the read results are on Scale1.
64k Block Sequential Read - 100mb File Size
3%
5%
5%
5% 5%5%
17%
20%
23%
24%
1
IOZone Threads
CPU Utilization %
Throughput KBs -
Scale1
Clear CPU EVFS CPU Clear read EVFS read
Figure 23: Sequential Reads VxFS Tuning 5% dbc_max