The following is a demonstration of the iofile.d script,
 
 
 Here we run it while a tar command is backing up /var/adm,
 
    # iofile.d
    Tracing... Hit Ctrl-C to end.
    ^C
       PID CMD              TIME FILE
      5206 tar               109 /var/adm/acct/nite
      5206 tar               110 /var/adm/acct/sum
      5206 tar               114 /var/adm/acct/fiscal
      5206 tar               117 /var/adm/messages.3
      5206 tar               172 /var/adm/sa
      5206 tar              3605 /var/adm/messages.2
      5206 tar              4548 /var/adm/spellhist
      5206 tar              5769 /var/adm/exacct/brendan1task
      5206 tar              6416 /var/adm/acct
      5206 tar              7587 /var/adm/messages.1
      5206 tar              8246 /var/adm/exacct/task
      5206 tar              8320 /var/adm/pool
      5206 tar              8973 /var/adm/pool/history
      5206 tar              9183 /var/adm/exacct
         3 fsflush         10882 <none>
      5206 tar             11861 /var/adm/exacct/flow
      5206 tar             12042 /var/adm/messages.0
      5206 tar             12408 /var/adm/sm.bin
      5206 tar             13021 /var/adm/sulog
      5206 tar             19007 /var/adm/streams
      5206 tar             21811 <none>
      5206 tar             24918 /var/adm/exacct/proc
 
 In the above output, we can see that the tar command spent 24918 us (25 ms)
 waiting for disk I/O on the /var/adm/exacct/proc file.