Probably because rrdtool suggests Derive over Counter....
> NOTE on COUNTER vs DERIVE > by Don Baarda <[EMAIL PROTECTED]> > > If you cannot tolerate ever mistaking the occasional counter reset for a > legitimate counter wrap, and would prefer ``Unknowns'' for all legitimate > counter wraps and resets, always use DERIVE with min=0. Otherwise, using > COUNTER with a suitable max will return correct values for all legitimate > counter wraps, mark some counter resets as ``Unknown'', but can mistake some > counter resets for a legitimate counter wrap. > > For a 5 minute step and 32-bit counter, the probability of mistaking a > counter reset for a legitimate wrap is arguably about 0.8% per 1Mbps of > maximum bandwidth. Note that this equates to 80% for 100Mbps interfaces, so > for high bandwidth interfaces and a 32bit counter, DERIVE with min=0 is > probably preferable. If you are using a 64bit counter, just about any max > setting will eliminate the possibility of mistaking a reset for a counter > wrap. > http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html -------------------- m2f -------------------- Read this topic online here: http://community.zenoss.com/forums/viewtopic.php?p=15400#15400 -------------------- m2f -------------------- _______________________________________________ zenoss-users mailing list [email protected] http://lists.zenoss.org/mailman/listinfo/zenoss-users
