Ive noticed that at times, especially with network interface data, blocks of data are missing from the graphs.  It is not like they are 0, the line just disappears, only to show up again and hour or so later.  It does not seem to do it at the same time on each of my interfaces or at the same time on a single interface.  It is completely random.
 
I have 19 hosts & monitor 200 interfaces.  This is a small implementation compared to some, and I am running on a fairly decent system.
 
Is this normal or could something be wrong?
 
Thanks,
 
Dave Hildebrand
 
System Administrator
Information Systems
Sioux Lookout Meno-Ya-Win Health Centre
PO Box 909
Sioux Lookout, ON
P8T 1B4
807-737-3700 ext233
dhildebrand@slmhc.on.ca