On Sat, 18 Sep 2010, Steve Shipway wrote: > What he said. > > You might also want to increase the length of the RRA proportionally, as > well, and maybe decrease the DS heartbeat (as you have a shorter step > size now). Also, with a 1-dp RRA, you dont need to have the MIN and > MAX, as they will be the same as the AVG for a group of a single point. > > Try this: > > rrdtool create arcsize.rrd --start N --step 15 > DS:arcsize:GAUGE:30:0:5000 RRA:AVERAGE:0.5:1:43920
Wow. Thanks (and thanks Pablo). That whole part of the "rrdtool create" doc was totally unclear to me. This kind of makes sense now, as long as I don't try to figure out the "xfilefactor". > If you want the 1-hour CDP RRAs as well (for graphing purposes) then > just add the original 3 RRA definitions to the end of the statment: At first I was a little stumped because my rrd had a ton of empty values before the collection started. But I suppose that's what the "RR" part of rrd is, right? I have to always pre-define how much data I'm going to store. I just set a start/end time on the graph command and that seems to work well. Anyhow, thanks again - this is an awesome tool. I'm looking at %busy and ops/sec for 4 disks in a zfs raidz-1 setup as well as system load and the size of the zfs arc cache while I do some bulk loads into postgres and fiddle with various tuning parameters. I settled on a 5 second sample. Having a visual representation of what's going on is great. Charles > rrdtool create arcsize.rrd --start N --step 15 > DS:arcsize:GAUGE:30:0:5000 RRA:AVERAGE:0.5:1:43920 RRA:MIN:0.5:12:3660 > RRA:MAX:0.5:12:3660 RRA:AVERAGE:0.5:12:3660 Steve > > > Steve Shipway > University of Auckland ITS > UNIX Systems Design Lead > [email protected]<mailto:[email protected]> > Ph: +64 9 373 7599 ext 86487 > > ________________________________ > From: [email protected] > [[email protected]] on behalf of > Pablo Sanchez [[email protected]] > > The problem is your RRA's are consolidating 12 points: 12 x 15 > (second steps) = 180 seconds. > > Change your RRA's so they consolidate one step and you'll get what > you're after. > _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
