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.