On 2/28/07, Alex van den Bogaerdt <[EMAIL PROTECTED]> wrote: Hello Again Alex,
> Find out (using rrdtool info) how much entries there are on the wheel. > Find out how much time is stored in each entry. Multiply those and > you know how much data to fetch. > > If each "step" is 300 seconds, if there are 24 steps per CDP, then each > CDP is 7200 seconds (2 hours). If there are 600 CDPs in this RRA, then > there is 1200 hours (300*24*600) worth of data available. > In this example, --start now-1200h will probably do. Perhaps add > --end start+24h to limit the amount of rows returned. OK. I'm throwing out all I know (or think I know) about SQL, putting on my RRD hat, and trying to figure this out. From what you said above, I need three things to find the time of the initial entry: 1. The step value 2. The number of steps per CDP 3. The number of CDPs in the RRA Using rrd_info, I only see the first. Does the output of `rra[i].rows' correspond to the number of CDPs in the RRA? Also, I see `rra[i].pdp_per_row'. Is that what you mean by the number of steps per CDP? The output of rrd_info is showing me four RRAs with a CF of AVERAGE; they differ by `pdp_per_row' and `cdp_prep[j].value'. If `pdp_per_row' is what you mean by the number of steps per CDP, then which of these RRAs do I use? Any further clarification you can offer on this matter is much appreciated. -- Regards, Travis Spencer _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
