On Sat, Sep 22, 2001 at 04:51:42PM +0200, Alex van den Bogaerdt wrote:
> > I need this for sum kind of summing up over severaly rrd files.
> > It's even no solution to set the values to 0 while graphing because I
> > already distinguish zero and undef value there, and a definitly want zero
> > values in the rrd.
> 
> It is possible to change unknowns into zero only for a specific time
> range.  However, this means that you need to alter your scripts and
> you may not want to do that.  If you want to give it a try anyway:
> 
> Suppose you'd like to change unknowns encountered before januari 1st 2001.
> TIME,978303600,LT  results in a true value if the time from the value
> is before that date.  If you know for sure the RRD was created at that
> date, you can just change any value (always unknown) into 0:
> 
>    DEF:old=   (etcetera)
>    CDEF:new=TIME,978303600,LT,0,old,IF
> 
> This will result in 0 if the entry was before time 978303600 and it will
> return the real value from the DEF if not. All other unknown data will
> remain in the result as it is not touched.
> 
> 
> If you know you will encounter this problem in the future, you may
> want to fill your databases with zeros at create time.  This can be
> done as I described.
> 1) create a database that ends well before "now".  The difference in
>    time should be at least the amount of time that is stored in the
>    largest RRA 
> 2) The DSes should be GAUGE.  The heartbeat should be large enough to
>    accomodate for a huge update
> 3) update the database with value 0 and time "now"
> 4) use "rrdtool tune" to set the correct DS type and heartbeat
> 
> The update will fill the entire RRD with zero, resulting in a database
> that has a known history, not an unknown history.  The end time is 'now'
> just as for a normally created rrd file.

This seemed to be a lot of work, so I tried my first idea first, and it
was much more easy that I expected.

I will try your suggestion for in my main script some time.

Thank you!



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