Monitor IO performance

[jv]

Here is a comparison for you:

[vic at yeaguy ~] uname -a
FreeBSD yeaguy.com 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 
16 22:34:59 UTC 2014 root at snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  
amd64
[vic at yeaguy ~] sudo ioping -R /tmp

--- /tmp (ufs /dev/ada0p4) ioping statistics ---
1.5 k requests completed in 3.0 s, 516 iops, 2.0 MiB/s
min/avg/max/mdev = 187 us / 1.9 ms / 12.5 ms / 2.8 ms
[vic at yeaguy ~]

On 3/17/2014 7:42 AM, n j wrote:
> Hi,
>
> I'm having issues with IO performance on a 10.0-RELEASE VPS. I suspect my
> provider might have oversold the resources. I'd like to collect some
> statistics before I send them a complaint. I'd welcome any help or pointers
> to links/documentation on how to best test IO performance and collect IO
> statistics on a prolonged period (e.g. run something every 2 hours for a
> few days or something like that) and actually make some sense out of those
> numbers. Right now, I'm thinking about running ioping
> (/usr/ports/sysutils/ioping) as I find its output quite clear, but I'm not
> sure how good an indicator it is without a benchmark to compare it to.
>
> Here's a sample run, these numbers look abysmally low to me:
> # ioping -R /tmp
> --- /tmp (ufs /dev/ada0s1a) ioping statistics ---
> 66 requests completed in 3.0 s, 21 iops, 87.8 KiB/s
> min/avg/max/mdev = 756 us / 45.6 ms / 681.1 ms / 128.2 ms
>
> P.S. The problems started some time ago and might also be related to the
> 10.0-RELEASE upgrade. I can't really pinpoint if the problems started with
> the upgrade or not, but would appreciate info if anyone else experienced
> any IO performance degradation after the upgrade.
>
> Thanks,