[rrd-users] Impact of daylight saving on mrtg

[Tobias Oetiker]

Tomorrow Firdous Saleheen wrote:

> Hi Tobi,
>
> So there will be no gap in MRTG graph when forwarding the clock and no
> overlapping when it will come back to the original time??
>
> Btw, our MRTG server clock will be forwarded 1 hour in that moment(daylight
> saving).
>
> Your suggestion would be highly appreciated!

Hi Firdous,

on unix server the time does not change, only the 'localtime' this
is merily a rendering based on UTC. If you actually modify the
clock of the server, and UTC time is affected by it, then things
are bound to go bad ... (not only mrtg and rrdtool though).

cheers
tobi

>
> Cheers,
>
> Firdous Saleheen
>
>
> -----Original Message-----
> From: Tobias Oetiker [mailto:tobi at oetiker.ch]
> Sent: Monday, June 08, 2009 2:46 AM
> To: Firdous Saleheen
> Cc: rrd-users at lists.oetiker.ch
> Subject: Re: [rrd-users] Imnpact of daylight saving on mrtg
>
> Hi Firdous,
>
> Tomorrow Firdous Saleheen wrote:
>
> > Hi,
> >
> > We are using MRTG with RRDtool for network monitoring. The specifications
> > are as belows:
> >
> > MRTG version : 2.16.2
> > RRDtool version : 1.2.27
> > SNMP version : 1 and 3
> > Platform : CentOS release 5.2 (Final)
> >
> > My question is that is there any effect of daylight saving on MRTG graph?
> > Do I need to change anything?
> >
> > I live in Bangladesh which maintains BDT(UTC+6hr) for its time. From 19
> June
> > , 2009 it would forward its clock one hour i.e. the time would be then
> > UTC+7hr. But there is no standard defined like Bdt  for it.
> >
> > Can anyone plz let me know the impact or give me some resources impact of
> > daylight saving on mrtg?
>
> rrdtool (and mrtg) work at UTC internally, so daylight saving time
> has no effect on them ...
>
> cheers
> tobi
>
> >
> >
> > It would be highly appreciated
> >
> >
> >
> >
> > Firdous Saleheen
> >
> >
> > _______________________________________________
> > 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