HP-UX Encrypted Volume and File System Performance and Tuning

Note: Cached EVFS Data
EVFS encrypts data at rest on the storage device – data in
system memory (buffer cache) exists in the clear.
64k Cached Sequential Reads - 100mb File Size
1%
4%
9%
12%
23%
2%
4%
8%
21%
45%
1 10 25 50 100
IOZone Threads
CPU Utilization %
Throughput KBs -
Scale30
Clear CPU EVFS CPU Clear Reads EVFS reads
Figure 20: Cached Sequential Reads VxFS Tuning
Applying the VxFS tunes to the cached read test improves the throughput to about 100 times that of
non-cached with default tuning.
Clearly, these results are specific to applications that are instrumented to optimize read-only data. For
these types of applications, EVFS can provide the security of encrypting data at-rest without any
throughput degradation.
Note: CPU Spike for 50 and 100 Threads
For the test above, the CPU utilization for EVFS spiked noticeably
for the 50-thread and 100-thread tests. This spike was not
evident for the cached read default tuning test. This CPU spike
is currently being investigated.