[rrd-users] Counter resets - how to handle?

[Philip Peake]

 Just to close the loop:

Made the changes, tested, works perfectly -- thanks again Alex!

On 9/15/2010 9:18 AM, Philip Peake wrote:
>  Thanks Alex.
>
> I had actually just been pushing zeros into the DB while the process was
> down.
>
> I see what you are doing - enter an "unknown" value, which will "reset"
> the counter, then zero as a reference point, followed by the actual value.
>
> I can't do exactly this, because my DB actually contains 9 counters, and
> typically only one of them will go offline.
>
> However, I do know when it goes offline, so the first time I can enter a
> 'U', and subsequently just zeros. Then when it comes back online it
> should pick up correctly.
>
>
> On 9/15/2010 7:40 AM, Alex van den Bogaerdt wrote:
>> ----- Original Message ----- 
>> From: "Philip Peake" <philip at vogon.net>
>> To: <rrd-users at lists.oetiker.ch>
>> Sent: Wednesday, September 15, 2010 4:35 PM
>> Subject: [rrd-users] Counter resets - how to handle?
>>
>>
>>> I am sampling a counter inside a software process (operations count)
>>> and plotting the result over time as a graph.
>>> I am using type COUNTER - since this is what it is.
>> Good.
>>
>>> All works well until for some reason the process has to be restarted.
>>> At that point rrdtool assumes that the counter overflowed, and shows a
>>> huge number of operations.
>> Yep.
>>
>>> Any suggestions on how to deal with this?
>> Solution: see my site, http://www.vandenbogaerdt.nl/rrdtool and click on 
>> RRDtool update tutorial with examples
>> This will work if you know a reset is about to occur, or just has occured.
>>
>> Workaround: set an reasonable maximum for your RRD, so that spikes are 
>> ignored. Use rrdtool tune to change the maximum allowed rate.
>>
>> HTH
>> Alex
>>
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