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

Richard Curtis ricurtis at gmail.com
Mon Oct 26 18:27:20 CET 2009

>> 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.

Thanks for your help on this!


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