When exporting data, Start date for RRDfile does not match start date of first data row

[trytrytogo]

Cacti 1.2.10
Centos 7.2
Mysql:mysql Ver 15.1 Distrib 10.4.12-MariaDB
rrdtool:RRDtool 1.7.2
i exported Previous month datas. i saw the "start time",it's wrong. it's start at 2020/4/1 0:10:00.

it's a bug or new change?
can you help me to reslove it. thanks.

[netniV]

I'm slightly confused because your filters suggest at 00:00 not 00:10, was that a typo?

[trytrytogo]

I'm slightly confused because your filters suggest at 00:00 not 00:10, was that a typo?

i select from "Previous month",it means the start date is 00:00, the first point should start at 00:05,
but it's first point started at 00:10,and not 00:05.

the end point is errors too.

[TheWitness]

The real issue here is that the dates are set when you first insert into the RRDfile. So, for example, you could get a daily RRA that has a timestamp that is not midnight, but say 2:00am or 4:00am, etc.

The way we do this is that at create time always initilize the first date:

rrdtool create some_rrd.rrd  --start 0 ...

The important part is "--start 0". Right now, that is not being done. Easy fix.

[TheWitness]

There is not much we can do about files that have already been created. You might consider using the splice_rrd.php function in the cli directory, but it'll take a long time to complete.

[trytrytogo]

There is not much we can do about files that have already been created. You might consider using the splice_rrd.php function in the cli directory, but it'll take a long time to complete.

thanks your replies. all cacti has same problems?

[TheWitness]

As far as I can tell. Looks like it was introduced post Cacti 1.x. Before it was never being set. I have a patch ready. Just waiting on the call to see where it should go.

[TheWitness]

This has been fixed. If you are on 1.2.12, you can pull the files directly from the 1.2.x branch.

[trytrytogo]

This has been fixed. If you are on 1.2.12, you can pull the files directly from the 1.2.x branch.

thanks,i will have a try to test it . thanks.