very strange IO issue with FreeBSD 8 and SSD

[Jan Koum]

On Mon, May 2, 2011 at 8:26 PM, Adam Vande More <amvandemore at gmail.com>wrote:

> On Mon, May 2, 2011 at 6:36 PM, Jeremy Chadwick <freebsd at 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)