Observing I/O Behavior with the DTraceToolkit

The DTrace framework works by integrating several providers into the Solaris kernel. Each provider contains a set of probes, which are locations in the kernel where actions (e.g., capture a stack trace, record an argument to a function, etc.) can be applied when the probe is triggered. Probes are enabled programmatically through libdtrace or through the dtrace(1m) command-line utility, which is preferred.