Thanks Peter, for the detailed description. However, I have some doubts. 1. What does granularity mean here? How does a lower or a greater granularity affect or improve the performance of Smokeping’s graphing? In other words, how does that bother an administrator?
2. With steps=144, granularity is 72 minutes lasting for 36 days, with steps=12, granularity is 6 minutes lasting for 18 days. Which one does Smokeping use or default to? 3. With this calculation, does it mean that *“step=300”* under my **** Database **** section in *config *file will always maintain a graph of *360 days*? If yes, can I simply change the value of *step*, *steps* or *rows* to retain data for as long as I wish to? Regards, Jimmy =-=-=-= On Sat, Jan 2, 2010 at 12:27 AM, Peter Kristolaitis <alte...@alter3d.ca>wrote: > First of all, happy new year to everyone on the list! I hope that 2010 is > a productive and fruitful year for you all. > > To answer the easy question first -- yes, your RRA files will be 2.8MB > forever. An RRA 'database' contains a finite, static number of records, and > old records are discarded as new data is put in; rrdtool makes the files > large enough to handle all possible records at creation time, so your file > will never grow. > > With regard to how long Smokeping will continue graphing -- well, forever. > Because old records are cycled out when new data is put in, Smokeping will > continue to operate indefinitely and will only show 'current' data. A > related issue is how much *history* will be retained, and this is strictly > dependent on how you've configured Smokeping (specifically, the 'step' value > and the 'steps' and 'rows' data from the RRA definitions in the '*** > Database ***' section of the configuration file). > > Example: > > *** Database *** > > step = 30 > pings = 20 > > # cons xff steps rows > AVERAGE 0.5 1 1008 > AVERAGE 0.5 12 4320 > MIN 0.5 12 4320 > MAX 0.5 12 4320 > AVERAGE 0.5 144 720 > MAX 0.5 144 720 > MIN 0.5 144 720 > > The 'step = 30' part means that Smokeping will poll (and thus generate a > new RRA row) every 30 seconds. > > The 'steps' part of the RRA definition are how many 'step's are > consolidated for a given row. In the example, we have 1, 12, and 144; this > means that we're storing data at 3 different levels of granularity: 1*30 = > 30 seconds, 12*30 = 360 seconds, and 144*30 = 4320 seconds. > > The 'rows' part of the RRA definition tells you how many records that RRA > definition will hold. > > Using 'step', 'steps' and 'rows', you can calculate how much 'time' an RRA > will cover: > time in seconds = step * steps * rows > > So if we look at the line "AVERAGE 0.5 144 720", it will hold: > time = 30 * 144 * 720 = 3,110,400 seconds (36 days) > > This means that you will be able to get at most 36 days of history at a > granularity of 72 minutes (30*144 seconds). If you wanted to see the data > more granularly (6 minutes -- 30*12 seconds), then you would have to set > your graphs to show at most 30*12*4320 = 1,555,200 seconds (18 days). > > - Peter > > > > Jimmyboy wrote: > > Hi All, > > I am using Smokeping 2.3 on my Ubuntu desktop machine since more than 1 > month. The size of all .rra files shows up as 2.8MB ever since they have > been created. > > Can anyone tell me how do I know till what time would Smokeping continue > graphing. Is it going to be a few months, 1 year or 2, etc...? Will the size > remain 2.8MB forever? > > > Thanks, > Jimmy Jose > > =-=-= > > ------------------------------ > > _______________________________________________ > smokeping-users mailing > listsmokeping-us...@lists.oetiker.chhttps://lists.oetiker.ch/cgi-bin/listinfo/smokeping-users > > >
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