seeksize.d - print disk event seek report. Uses DTrace. seeksize.d seeksize.d is a simple DTrace program to print a report of disk event seeks by process. This can be used to identify whether processes are accessing the disks in a "random" or "sequential" manner. Sequential is often desirable, indicated by mostly zero length seeks. Since this uses DTrace, only the root user or users with the dtrace_kernel privilege can run this command. Solaris stable - needs the io provider.

Sample until Ctrl-C is hit then print report, # seeksize.d

PID process ID

CMD command and argument list

value distance in disk blocks (sectors)

count number of I/O operations

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