[NEED HELP!] Why there's emtpy gap from the graphs?

[melvintang]

Hi Experts,

I have tried to google about this issue, but can't find much info from net.
Is that anyone here can advise/give me some idea how to fix it?

PS: Not only Memory graphs, it also appear in other graphs as well (e.g. Network, CPU and etc)
Which I'm confirmed there's no downtime/network lost happened.

A million thanks in an advance!

Best regards,
Melvin

[gandalf]

It may happen, that polling time has been larger then the poller interval at these times. See cacti.log and grep for "SYSTEM STATS"
R.