I think the problem exists in the step: write values to rrd files. PS: The problem even exists in Localhost - Load Average, after a clean cacti try to delete all rrd on ./rra/ folder ? your rrd "ds[cisco_memfree]= 1.0000000000e 12", is the snmp results that you saw on debug log exceeded the limit "ds[cisco_memfree]= 1.0000000000e 12" ?Spin up a Cent OS 6.3 x64 droplet that will be used to connect to all your other servers.777 may be too open for these sections security-wise, and if so, I would gladly appreciate a better setting to be mentioned that still provides usability of the application.set the cacti logging to DEBUG and check all Poller Statistics, Poller Errors, Poller Warning options, check files, usually it will showing the output, you can start investigate from the log /rra/xxx.rrd". But when verify with "rrdtool info xxx.rrd", "rra.cdp_prep.value = Na N" displays. are you try using all patches on cacti website for your cacti version.This means that RRD database files will never grow in size.
RRDtool is a great facility which aims to replace MRTG and was written by Tobias Oetiker.We highly suggest using RRDtool v1.2.x which require very few dependancies compared to v1.4.x.You may not be familiar with the term RRD graph, but if I show you one, you probably recognize them instantaneously.Are permissions for the file/directory set properly to allow for this?In reply to your comment that file/directory ownership/permissions may be the issue, I will share what I have found to be useful for my Cacti installations that run on Open BSD (aka, your placement and syntax may vary with other systems): chown -R www:www /var/www/htdocs/* echo 'web directories reset to www:www ownership' chmod -R 777 /var/www/htdocs/cacti/plugins/* chmod -R 777 /var/www/htdocs/cacti/log/* chmod -R 777 /var/www/htdocs/cacti/rra/* echo 'cacti plugin, log, and rra directories set to full r,w,x' I use weathermaps heavily in cacti and often find myself having to reset permissions over and over throughout and this has save me the headache of thinking about it constantly.