Hi Luca, ntop-dev, (Luca, we talked a little bit about this already - so this just serves as a reminder and to inform ntop-dev). Just an idea for something I stumbled upon with the RRD dump option in ntop. When RRDdumping to a large number of different RRDs the system load gets a big spike. For example, when enabling host RRD dumps in our setup (on a /16 net with about 25k active hosts) it has to update *a lot* of rrds. Although I use a RAID10 setup on SCSI disks, still the system gets a high load spike when it's dumping time. Maybe it is an idea to spead the total disk I/O (i.e. the RRD dumps) within the interval that is set to do the dumps. (So very simply put: why do 25000 RRD updates once in 5 minutes, instead of 5000 each minute in this 5 minute interval?). Regards, Robbert
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