Question: I've got an RRDtool graph that has a huge spike after a reboot. I've tried using the popular `removespikes.pl` script on it, but just returns a "No peaks found.!". What's the best way to take care of this?

Answer: 
I'd recommend this [perl script](http://oss.oetiker.ch/rrdtool/pub/contrib/removespikes.tar.gz), which is available on the rrdtool contrib page itself. I've used it the past and it works fine. It automatically removes the spikes and it even does a backup of the .rrd file :) 

Quoting the README file:

> 
> README for removespikes.pl
> 
> 
> This version of removespikes.pl is
>  based on Vins Vilaplana and Humberto
>  Rossetti Baptistas code.
> 
> 
> I have added value-based chopping (-t
>  value), an analysis-only mode (-a),
>  control of verbose/debug output
>  (-d/-v), a help option (-h) and some
>  code cleanup.
> 
> 
> removespikes>./removespikes.pl -h
>  REMOVESPIKES: Remove spikes from
>  RRDtool databases.
> 
> 
> Usage: ./removespikes.pl -d -a [-l
>  number] [-t maxval] name\_of\_database
> 
> 
> Where: -d enables debug messages  
> 
>  -a runs only the analysis phase of the script  
> 
>  -h prints this message  
> 
>  -l sets the % limit of spikes bin-based chopping (default: 0.6)  
> 
>  -t sets the value above which records are chopped. Disabled by default. 
>  Enabling value-based chopping will disable bin-based chopping.
> 
> 
> -v Verbose mode. Shows some information name\_of\_database is the rrd file to be treated.
> 
> 
> removespikes>
> 
> 
> Enjoy
> 
> 
> 

**EDIT**: I've now seen that you already tried `removespikes.pl` but you got "no peaks found". Try to use it with -t flag, this should solve your problem.
My normal answer is "You can't edit RRD files." or "You have to use `rrdtool` to dump it, edit the dump and restore it - that's too much work!", but you seem like a nice guy so I'll point you at [rrdEditor](http://www.leith.ie/rrdeditor/) :-)