Date: Tue, 04 Nov 2008 11:47:29 -0500 From: Adam McDougall <mcdouga9@egr.msu.edu> To: Eduardo Meyer <dudu.meyer@gmail.com> Cc: stable@freebsd.org, questions@freebsd.org Subject: Re: Disk top usage PIDs Message-ID: <49107CA1.5090309@egr.msu.edu> In-Reply-To: <d3ea75b30811040612g3ba10a8fuf5551b730176acc2@mail.gmail.com> References: <d3ea75b30811040612g3ba10a8fuf5551b730176acc2@mail.gmail.com>
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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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