[rancid] eliminating noise

[Alan McKinnon]

On 20/11/2014 08:39, Robert Drake wrote:
> What you need is a network monitoring system that supports thresholds. 
> The problem with doing this with rancid is that you probably don't run
> it often enough to see changes when they happen, and you don't know that
> when you run it you'll be at an outlying temperature.
> 
> Say run #1 happens at 6:00pm and the temperature is 25C, run #2 happens
> at 8:00pm and the temperature is 35C.  That's perfect, but what happens
> if there is an incremental climb through the afternoon and you get 28C,
> then 32C, then 35C?


I fully agree with this statement.

Within the context of rancid, do we really care about things like fan
speed and voltage levels at all? I doubt it very much - rancid is a
state tracker and lets you record changes in configured state over time,
and never forgets it

Fan speed is different, along with many other facts that show up in show
<*>, and just because the OS reports these facts and makes them
available is not a valid reason why rancid should track them.





> 
> 
> On 11/19/2014 11:48 PM, Peter Jackson wrote:
>> Frank,
>>
>> I believe Wayne would like to keep the command output but only record
>> a change if the variable differs by a set amount.
>>
>> So in Wayne's example we want RANCID to record a different temperature
>> only if it was 10 degrees higher or lower than the last RANCID run.
>>
>> You wouldn't see this diff:
>>
>> - ! External Temperature............................. +25 C
>>
>> + ! External Temperature............................. +30 C
>>
>>
>> But you would see this one:
>>
>> - ! External Temperature............................. +25 C
>>
>> + ! External Temperature............................. +35 C
>>
>>
>> We have removed a lot of command output for just this reason - because
>> it sends too many diffs to be useful.  But having something like what
>> Wayne suggests would be really nice and we would be able to add those
>> commands back to RANCID without getting all of the insignificant diffs.
>>
>> Peter
>>
>>
>>
>> On Wed, Nov 19, 2014 at 6:48 PM, Frank Bulk <frnkblk at iname.com
>> <mailto:frnkblk at iname.com>> wrote:
>>
>>     Just update the relevant script to ignore those lines.
>>
>>      
>>
>>     Frank
>>
>>      
>>
>>     *From:* Rancid-discuss
>>     [mailto:rancid-discuss-bounces at shrubbery.net
>>     <mailto:rancid-discuss-bounces at shrubbery.net>] *On Behalf Of
>>     *Wayne Eisenberg
>>     *Sent:* Wednesday, November 19, 2014 5:09 PM
>>     *To:* 'rancid-discuss at shrubbery.net
>>     <mailto:rancid-discuss at shrubbery.net>'
>>     *Subject:* [rancid] eliminating noise
>>
>>      
>>
>>     Hey all,
>>
>>      
>>
>>     Does anyone have any ideas on how we can modify rancid to ignore
>>     minor differences in things like fan speed and temperature? See
>>     the below:
>>
>>      
>>
>>     - ! External Temperature............................. +29 C
>>
>>     + ! External Temperature............................. +28 C
>>
>>      
>>
>>     -  ! Fan Status....................................... 3432 rpm
>>
>>     + ! Fan Status....................................... 3301 rpm
>>
>>      
>>
>>     These two items create a lot of noise. The temperature changes by
>>     1 or 2 degrees – very insignificant, but it gets caught by diff.
>>     The same with the fan speed. Any character change trips the diff.
>>     +/- 10% or greater is a more reasonable change to note. But I
>>     don’t know how to modify the scripts to do that comparison. Any ideas?
>>
>>      
>>
>>     Thanks,
>>
>>     Wayne
>>
>>      
>>
>>      
>>
>>      
>>
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-- 
Alan McKinnon
alan.mckinnon at gmail.com