Date: Wed, 12 Oct 2011 21:06:32 +0200 From: Wiktor Niesiobedzki <bsd@vink.pl> To: Patrick Proniewski <patpro@patpro.net> Cc: Mikolaj Golub <trociny@freebsd.org>, freebsd-fs@freebsd.org Subject: Re: measuring IO asynchronously Message-ID: <CAH17caUYJ4hj_bPqOcNg33OhytdzELjiHOs4CjV%2B75-5fcQO8w@mail.gmail.com> In-Reply-To: <94455706-B90D-4DBD-A7DE-E9A38F118D35@patpro.net> References: <20110915120007.F41FF10656E1@hub.freebsd.org> <4B8C8026-1E12-4C32-88E3-9B34A3E58A91@patpro.net> <86ipnwg1s0.fsf@kopusha.home.net> <94455706-B90D-4DBD-A7DE-E9A38F118D35@patpro.net>
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2011/10/12 Patrick Proniewski <patpro@patpro.net>
>
> On 10 oct. 2011, at 20:05, Mikolaj Golub wrote:
>
> > On Mon, 10 Oct 2011 16:33:11 +0200 Patrick Proniewski wrote:
> > PP> I would like to monitor the storage on various FreeBSD servers,
> > PP> especially I/O per seconds. Is there any way to gather statistics
> > PP> about I/O via asynchronous request, lets say, for example, using a
> > PP> munin plugin? =C2=A0`iostat -w 1` and `zpool iostat tank 1` are
> > PP> interesting, but not useable asynchronously.
> >
> > I use for this a simple program that I wrote some time ago. It uses dev=
stat(9)
> > kernel interface and outputs counters, like below
> >
> > kopusha:~% devstat ada0
> > ada0:
> > =C2=A0 =C2=A0 =C2=A0 =C2=A01339552256 bytes read
> > ../..
> > You can find it in ports (sysutils/devstat).
>
> Thank you Mikolaj, I'm going to give it a try!
>
What's wrong about iostat? (and how it is used by munin plugin)
%iostat -I -x
extended device statistics
device r/i w/i kr/i
kw/i wait svc_t %b
ada0 26756321.0 77603114.0 411881657.5 1192108987.0 0 3.2 1
ada1 13483063.0 1131450.0 943635180.5 43584216.0 0 5.7 0
ada2 13831313.0 1131763.0 943961104.5 43587768.0 0 5.5 0
Cheers,
Wiktor Niesiobedzki
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