report : Insufficient Data

[Meyer Jerome]

Hi 

 

Last week on Thursday I've stopped NAGIOS, deleted files under
/var/nagios and restart it (NAGIOS)!

Yesterday Nagios gives me Infos like these (when I choose report period
: Last Week) :

 

 

UP                  Total:3d 10h 17m 9s               Total_Time:48.98%
Known_Time:100% 

Undetermined        Insufficient Data:3d 13h 42m      Total_Time:51s
51.02%

All                 Total:7d 0h 0m 0s



What means this "insufficient data"? 
How Nagios calculate this "availability report"? Give any some Lectures
about < how interpreted Nagios graphs > ?
How do we must considered these messages?

Any Ideas?
jerome

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