Disk top usage PIDs

Brent Jones brent at servuhome.net
Wed Nov 12 12:04:30 PST 2008

On Tue, Nov 4, 2008 at 8:47 AM, Adam McDougall <mcdouga9 at egr.msu.edu> wrote:
> Eduardo Meyer wrote:
>> Hello,
>> I have some serious issue. Sometimes something happens and my disk
>> usage performance find its limit quickly. I follow with gstat and
>> iostat -xw1, and everything usually happens just fine, with %b around
>> 20 and 0 to 1 pending i/o request. Suddely I get 30, 40 pending
>> requests and %b is always on 100% (or more than this).
>> fstat and lsof gives me no hint, because the type of programs as well
>> as the amount of 'em is just the same.
>> How can I find the PID which is hammering my disk? Is there an "iotop"
>> or "disktop" tool or something alike?
>> Its a mail server. I have pop3, imap, I also have maildrop and
>> sometimes, httpd, working around the busiest mount point.
>> I have also started AUDIT, however all I can get are the top PIDs
>> which issue read/write requests. Not the requests which take longer to
>> perform (the busiest ones), or should I look for some special audit
>> class or event other than open, read and write?
>> Thank you in advance.
> top -mio
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Brent Jones
brent at servuhome.net

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