HP-UX 11i v3 Installation and Update Guide, February 2007 (Initial Release)

Controlling Memory Utilization of VxFS 4.1 on HP-UX 11i v3
Conclusion
Appendix B 153
Conclusion
VxFS uses in-memory caches for objects that result in improved file
system performance. The cache sizes are controlled by tunables that are
auto-tuned at boot time by the driver. For situations where the
auto-tuned values are not optimal, you can set these tunables.