On Wed, Feb 27, 2008 at 05:46:11PM -0800, Bill Shannon wrote:
> Is there a dtrace script usable by novices (i.e., me) that will help
> me figure out which process is accessing my disk every 3 seconds?
>
> I moved my home directory to an external disk and now I can hear the
> disk rattle every 3 seconds. It's driving me crazy! I really want
> to find the culprit.
>
> I found the DTraceToolkit and used the iofileb.d script, which is
> pretty close, but according to it there were no accesses to files
> on the disk I'm watching. That seems wrong. Really I'd like to get
> a trace as the accesses are happening, not a summary at the end.
>
> (BTW, any chance it's zfs itself accessing the disk?)
>
> Thanks.
# dtrace -n 'io:::[EMAIL PROTECTED]()}'
Wait a minute, and then hit ctrl-C for a summary. If you want
individual traces you can start with
# dtrace -qn io:::start'{printf("%s\n", execname);}'
or add execname tracing to /usr/demo/dtrace/iosnoop.d
of course you will see sched (zfs, pageout) waking up
and doing chunks on a regular basis, but not every 3 secs.
If you suspect a kernel issue you can aggregate by stack().
-Mike
--
Mike Shapiro, Solaris Kernel Development. blogs.sun.com/mws/
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