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#1 (**permalink**) 01-05-2008, 09:31 AM

Hello All,

What command(s) can I use to determine which process(es) are writing to
my disks.

When I run topas, iostat, sar, etc..., I can see that my hdisk5 is
getting written to, but how can I find out what process(es) are writing
to that hdisk?

I also ran fuser -u to see what process is on that filesystem and I got
back a oracle LISTENDER process, but that shouldn't be writing to disk
I would think.

Thanks!

#2 (**permalink**) 01-05-2008, 09:31 AM

In article <1147455166.516013.109720@v46g2000cwv.googlegroups .com>, dawaves <dawaves@gmail.com> wrote:
>
> What command(s) can I use to determine which process(es) are writing to
> my disks.

These two tools are mentioned a lot in the official IBM redbooks on AIX
performance monitoring and are sure to show up on AIX exams:

svmon, filemon

To answer your question: filemon.

From its man page:

filemon Command

Purpose

Monitors the performance of the file system, and reports the I/O
activity on behalf of logical files, virtual memory segments, logical
volumes, and physical volumes.

-Dan

#3 (**permalink**) 01-05-2008, 09:31 AM

Thanks Dan!

I did try filemon before but only put the "pv" layer, and that I just
tried it with the "all" option but did not find anything.

I think my DBA must've killed one of his processes.

Thanks!

#4 (**permalink**) 01-05-2008, 09:31 AM

The Oracle listener process will write to the listener.log, but
otherwise pretty much just provides details to the Oracle DB writer on
what needs to be done on the system. I would not think it would need to
do a lot of writing except to a sequential ascii text file on one of
the disks.

#5 (**permalink**) 01-05-2008, 09:31 AM

steven_nospam at Yahoo! Canada wrote:
> The Oracle listener process will write to the listener.log, but
> otherwise pretty much just provides details to the Oracle DB writer on
> what needs to be done on the system. I would not think it would need to
> do a lot of writing except to a sequential ascii text file on one of
> the disks.

Our Oracle 10gR2 environment actually logged quite a bit (50-80mb per
day) when
it was on.(about 1300 users)
Heavy logging also by http access_log and jserv.log. We keep our logs
off, then turn on
when investigating issue. We do run all error_logs (these should be
nearly empty)

It can easily be turned off....then turned on by exception if you want.
Link may help:

http://www.psoug.org/reference/listener.html

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DISK I/O Performance Monitoring