Why does my Cacti save the last 8 hours data ?

fairysky · Post by **fairysky** » Sun Jan 12, 2014 9:54 pm

I setup and keep my cacti running for a couple of weeks.
But I have a big problem that my cacti system only save and display the last 8 hours data ?
I could not save any data and graphic before 8 hours.
I checked the settings and figure out the root cause. But I failed.
I hope someone here can help me on it. Thank you very much !
(If you don`t understand what I said, please verify my pic in the attachment.)

fairysky · Post by **fairysky** » Mon Jan 13, 2014 12:56 am

anybody help me !

phalek · Post by **phalek** » Mon Jan 13, 2014 2:22 am

what polling interval are you using, 5 Min, 1 Min, 10 seconds ??

fairysky · Post by **fairysky** » Mon Jan 13, 2014 2:58 am

phalek wrote:what polling interval are you using, 5 Min, 1 Min, 10 seconds ??

Every minute

phalek · Post by **phalek** » Mon Jan 13, 2014 3:02 am

Now, did you change any of the RRA settings which define the timespan for the amount of data points to be stored in the RRD files ?

fairysky · Post by **fairysky** » Mon Jan 13, 2014 3:06 am

phalek wrote:Now, did you change any of the RRA settings which define the timespan for the amount of data points to be stored in the RRD files ?

Please verify my screen-shot.

phalek · Post by **phalek** » Mon Jan 13, 2014 3:34 am

Hi

First, you can use this post here to see what these numbers do to your rrd files ( in regards to data kept ):
http://forums.cacti.net/viewtopic.php?f=6&t=49190

For some example values to work with, you can refer to this post. Please be aware that any changes to these require you to delete and re-create all your graphs.
http://forums.cacti.net/viewtopic.php?p=115847#p115847

fairysky · Post by **fairysky** » Mon Jan 13, 2014 8:26 am

phalek wrote:Hi

First, you can use this post here to see what these numbers do to your rrd files ( in regards to data kept ):
http://forums.cacti.net/viewtopic.php?f=6&t=49190

For some example values to work with, you can refer to this post. Please be aware that any changes to these require you to delete and re-create all your graphs.
http://forums.cacti.net/viewtopic.php?p=115847#p115847

I seems not to figure out the root cause. I`m a little confused now.

phalek · Post by **phalek** » Mon Jan 13, 2014 8:34 am

Well, your RRA settings are for 5 minute polling and not for a 1 minute. So to translate the settings you have to a 1 minute polling interval, this gives us:

Hourly ( Steps: 1, Rows: 500 ) = 8,33 hours of data is kept before being overwritten.
Daily ( Steps: 1, Rows: 600 ) = 10 hours of data is kept before being overwritten.
Weekly ( Steps: 6, Rows: 700 ) = 3 days of data is kept before being overwritten.
Monthly ( Steps: 24, Rows: 775 ) = 13 days of data is kept before being overwritten.
Yearly ( Steps: 288, Rows: 797 ) = 159 days of data is kept before being overwritten.

So none of these hold enough data for your graphs to display a continuous block.

THis happens if you only switch the polling interval from 5 minutes to 1 minute without thinking about the consequences and without changing the RRA values accordingly.

fairysky · Post by **fairysky** » Mon Jan 13, 2014 10:16 am

phalek wrote:Well, your RRA settings are for 5 minute polling and not for a 1 minute. So to translate the settings you have to a 1 minute polling interval, this gives us:

Hourly ( Steps: 1, Rows: 500 ) = 8,33 hours of data is kept before being overwritten.
Daily ( Steps: 1, Rows: 600 ) = 10 hours of data is kept before being overwritten.
Weekly ( Steps: 6, Rows: 700 ) = 3 days of data is kept before being overwritten.
Monthly ( Steps: 24, Rows: 775 ) = 13 days of data is kept before being overwritten.
Yearly ( Steps: 288, Rows: 797 ) = 159 days of data is kept before being overwritten.

So none of these hold enough data for your graphs to display a continuous block.

THis happens if you only switch the polling interval from 5 minutes to 1 minute without thinking about the consequences and without changing the RRA values accordingly.

Sorry for my foolish, please tell me what I should change for 1 minute polling ? Thank you!

phalek · Post by **phalek** » Mon Jan 13, 2014 10:19 am

I posted this on my message with the 2 links, look at this post here:

http://forums.cacti.net/viewtopic.php?p=115847#p115847

fairysky · Post by **fairysky** » Mon Jan 13, 2014 9:05 pm

phalek wrote:I posted this on my message with the 2 links, look at this post here:

http://forums.cacti.net/viewtopic.php?p=115847#p115847

Do I need to "rebuild poller cache" after change ?

phalek · Post by **phalek** » Tue Jan 14, 2014 12:58 am

As said earlier: you need to delete all graphs and re-create them.

fairysky · Post by **fairysky** » Wed Jan 15, 2014 12:02 am

phalek wrote:As said earlier: you need to delete all graphs and re-create them.

Sorry, I still failed to fix this issue by your suggestion.
Do I need to change this settings from 600 to 120 ?
Anyway, thank you very much.

phalek · Post by **phalek** » Wed Jan 15, 2014 1:27 am

Yes indeed , Steps to 60 and HEartbeat to 120. Exactly as your screenshot shows it !

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