Today you sent me mail regarding [rrd-developers] Re: Restarting devices: *> Tobi, *> *> > what would that buy you, knowing the 'last' value ? RRD knows it *> internally, *> > so if there is anything interessting we can do with it, let me know ... *> > RRD already checks if it is smaller than the last value recorded ... *> *> What happens if at time t-1 I read the value 1000 from my router ifInOctets *> via SNMP. At time t I read 500... the counter is suposed to behave as an *> increasing value... how will RRDtool handle that? Will it store NaN?
yes unless -500+2^32-1 / 1 or -500+2^64-1 / 1 is between the two border values specified for the DS ... *> I had the same spike problems that Bert Driehuis had when the equipment is *> reset, which makes all my graphs unusable. Yes, I can force the min and max *> with 0 and the ifSpeed value, but it might not work all the time. Some *> spikes might appear. sure ... *> What should I do? My idea was to check manually if the current value is *> lower than the last value, and then store a NaN in this case. you could use the 'DERIVE' data type this is like counter but does not do any COUNT overflow magic, so if you give a min value of 0 you will get NaN for most of your resets ... another nice aporoch is to monitor the uptime of your equipment and store a U everytime you find that the device got reset ... cheers tobi *> *> Best Regards, *> Luis F Balbinot *> *> -- *> Unsubscribe mailto:[EMAIL PROTECTED] *> Help mailto:[EMAIL PROTECTED] *> Archive http://www.ee.ethz.ch/~slist/rrd-developers *> -- ______ __ _ /_ __/_ / / (_) Oetiker, Timelord & SysMgr @ EE-Dept ETH-Zurich / // _ \/ _ \/ / TEL: +41(0)1-6325286 FAX:...1517 ICQ: 10419518 /_/ \.__/_.__/_/ [EMAIL PROTECTED] http://ee-staff.ethz.ch/~oetiker -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-developers
