>> But is there any way to say rrdupdate that there is no wrap ? For example, >> if I getting counters from network device interface, >> and >> I really know that device was rebooted recently, is there any way to say >> rrdupdate that only THIS counter value should not be >> wrapped, but all subsequent values should be wrapped when necessary ? > > What do you know? > > 1: you know the most recent update (this is already in RRDtool) > 2: you know a reboot has occured > 3: you know the counter starts at zero when a reboot occurs > > In step 2, you probably also know (or can know) the exact time when > this reboot occured. > > What do you NOT know? > > 1: the interval between the most recent update and the reboot > 2: the countervalue at time of reboot > 3: as a result of 1 and 2: the resulting rate is unknown > > if you do not know the exact time of the reboot: > 4: the interval between the reboot and the first regular update > 5: as a result, you can't compute a rate and neither can RRDtool > > So, there are two distinct cases: > > a) you do know the exact reboot time > b) you don't > > > Some variables to be able to talk: > n countervalue at first poll after reboot > Tf time of first poll after reboot > Tl time of last poll before reboot > Tr time of reset > > In case (a): > Update your database at time Tr-1 with value U > Update your database at time Tr with value 0 > Update your database at time Tf with value n > > Result: > Time Tl to Tr has an unknown rate. > Time Tr to Tf has a known rate of n/Tf > > In case (b): > Update your database at time Tf-1 with value U > Update your database at time Tf with value n > > Result: > Time Tl to Tr has an unknown rate. > Time Tr to Tf has an unknown rate as well.
Aha, so updating with value U at T-1 will not cause wrap when updating with value 0 at T. Really I guess something like that. Thanks. -- Oleg Derevenetz <[EMAIL PROTECTED]> OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
