rfsio.d - read FS I/O stats, with cache miss rate. Uses DTrace. rfsio.d This script provides statistics on the number of reads and the bytes read from filesystems (logical), and the number of bytes read from disk (physical). A summary is printed every five seconds by filesystem. A total miss-rate is also provided for the file system cache. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris unstable - this script uses fbt provider probes which may change for future updates of the OS, invalidating this script. Please read Docs/Notes/ALLfbt_notes.txt for further details about these fbt scripts.

Print a summary of activity every five seconds. # rfsio.d

Richard McDougall, Solaris Internals 2nd Ed, FS Chapter.

See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with verbose descriptions explaining the output. rfsio.d will run until Ctrl-C is hit. Brendan Gregg [Sydney, Australia] rfileio.d(1M), dtrace(1M)