Date: Mon, 2 May 2011 20:53:00 -0700 From: Jan Koum <jan@whatsapp.com> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-fs@freebsd.org, Chris Peiffer <chris@whatsapp.com> Subject: Re: very strange IO issue with FreeBSD 8 and SSD Message-ID: <BANLkTinQt4YZiudZUSgxL0x8dJ6MJTueRw@mail.gmail.com> In-Reply-To: <BANLkTik5tXegwoRvB7XAvpEPb385KjGEtA@mail.gmail.com> References: <BANLkTin-qEoxxFbjJkDaA_-UZMkza08NNQ@mail.gmail.com> <20110502233601.GA29710@icarus.home.lan> <BANLkTik5tXegwoRvB7XAvpEPb385KjGEtA@mail.gmail.com>
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On Mon, May 2, 2011 at 8:26 PM, Adam Vande More <amvandemore@gmail.com>wrote:
> On Mon, May 2, 2011 at 6:36 PM, Jeremy Chadwick <freebsd@jdc.parodius.com>wrote:
>
>> You might also try comparing iostat output to gstat output, though gstat
>> refreshes the screen continually making this a little difficult.
>>
>
> gstat -b
>
sure:
$ sudo gstat -b
dT: 1.007s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 605 33 137 0.4 572 4349 34.7 10.9 ad4
0 605 33 137 0.4 572 4349 35.8 10.9 ad4s1
0 620 25 149 1.0 595 4280 22.2 9.9 ad5
0 605 33 137 0.4 572 4349 36.5 11.0 ad4s1a
0 0 0 0 0.0 0 0 0.0 0.0 ad4s1b
0 60 18 60 1.1 42 169 2.5 3.6 ad6
0 817 30 121 0.2 787 5382 15.9 8.1 ad7
0 620 25 149 1.1 595 4280 23.1 10.0 ad5a
0 60 18 60 1.1 42 169 2.6 3.7 ad6a
0 817 30 121 0.2 787 5382 16.5 8.1 ad7a
>
> Also top -m io may help.
>
>
doubt it. these server only have a single process running (our app)
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