Monitor IO performance

[n j]

On Mon, Mar 17, 2014 at 4:16 PM, jv <jv at yeaguy.com> wrote:

> 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 ~]


Thanks for that. Although various systems could probably range from
first-class enterprise storage level to the cheap (oversold) VPS level,
this still shows a tremendous difference in performance.

Here is today's run:

--- /tmp (ufs /dev/ada0s1a) ioping statistics ---
352 requests completed in 4.1 s, 86 iops, 345.9 KiB/s
min/avg/max/mdev = 9 us / 11.6 ms / 1.5 s / 85.1 ms

What I find especially troublesome is the maximum request time of 1.5s
(yesterday's run 681ms). Also the mean deviation seems way too big (85.1ms,
yesterday 128.2ms - this is Internet-level latency).

I guess I'll have to talk to my VPS provider, though I regret not having
taken these statistics before the 10.0 upgrade as well.

Regards,
-- 
Nino