VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Performance Monitoring and Tuning
Performance Monitoring
Chapter 12 397
Using I/O Tracing
I/O statistics provide the data for basic performance analysis; I/O traces
serve for more detailed analysis. With an I/O trace, focus is narrowed to
obtain an event trace for a specific workload. This helps to explicitly
identify the location and size of a hot spot, as well as which application is
causing it.
Using data from I/O traces, real work loads on disks can be simulated
and the results traced. By using these statistics, you can anticipate
system limitations and plan for additional resources.