[xymon] Re: iostat monitor

[Vernon Everett]

Hi Roland

A good comment, and one I did consider.
My concern with a long sample, is that it becomes "too averaged".
If I put one hand in the fire, and the other in liquid nitrogen, on average,
I am doing fine, right? :-)

I think it's one of those things that will need to be flavoured to taste,
depending on your requirements, which is why I changed it to be a soft
parameter that could be set at server-side.
Ultimately, there is no difference in the results of running iostat 300 13
every hour, and iostat 300 2 every 5 minutes for one hour.
And will save a lot of coding :-)

Cheers
    Vernon


On Fri, Sep 10, 2010 at 5:56 AM, Roland Soderstrom <
rolands at logicaltech.com.au> wrote:

>  Vernon, I have an comment.
>
>
> ---------------------------------------------------------------------------------------------------------------
> -
> -
> -                                        100 dollar bill
>                                                       -
> -
> -  If you have a 10sec iostat which you run every 5min, as you set the test
> to run, you get huge gaps.        -
> -  Say that your server always have a lot of IO every 3min for 1
> min.                                         -
> -  You will probably miss all this IO, set it to the same as the
> clientlaunch time 5min = 300 in the script.  -
> -  iostat need to run constantly to make accurate measurements.
>                                   -
> -  That's why you see the default do 300
> sec.                                                                 -
> -
> -
>
> ---------------------------------------------------------------------------------------------------------------
>
> To get better accuracy you should probably run "iostat dxn 300 13" and run
> the script from clientlaunch every hour.
> A bit more coding to take care of the 11 "new" iostat though.
>
> - Roland
>
>
>
> On  9/09/10 06:56 PM, Vernon Everett wrote:
>
> Just updated the code. Minor change.
> After discussion with a colleague we thought that a 2 second iostat sample
> might not be adequate.
> We settled on 10, but with the update, I have made it a parameter, which
> can be set at server side.
>
> Cheers
>     Vernon
>
> On Thu, Sep 9, 2010 at 1:56 PM, Vernon Everett <everett.vernon at gmail.com>wrote:
>
>> Hi all
>>
>> Just posted an iostat add-on, with graphing goodness to
>>
>> http://xymonton.trantor.org/doku.php/monitors:diskstat.ksh
>>
>>
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