[rrd-users] Missing data overnight from daylight saving changes

[Tobias Oetiker]

Richard,

Today Richard Curtis wrote:

> >> Am I missing something here?  I did insert a value for 256432400, but
> >> it looks like rrdtool is expecting a value for both 01:00 BST and
> >> 01:00 GMT.
> >
> > It needs a value for 1256428800 to keep the sequence intact.
> >
> > It doesn't care that one is 01:00 this or 01:00 that.  It just cares
> > that there's a gap of 7200 seconds, which exceeds the heartbeat limit of
> > 3600.
>
> Ah, now it makes sense.
> My script to collect the data runs via cron which ensures the script
> only ones once at DST change, so I am missing the data point for 01:00
> BST (rather, my loader script assumes the entry for 01:00 on the 25th
> Oct is GMT so there is nothing inserted.
>
> I've fixed in now based on this - I allow a 7200 second gap which
> allows the graph to continue uninterrupted.

I missed the sart of this thread, but note that rrdtool internally
only deals in GMT/UTC as such it does not care about daylight
saving time ... it is merily a presentation thing.

cheers
tobi


> _______________________________________________
> rrd-users mailing list
> rrd-users at lists.oetiker.ch
> https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
>
>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900