(e.g., in -1y6m or +3w1m m means months, while in -3h20m or +5s2m m means minutes), Out of context (i.e. 'May 31 -1month' = 'Apr 31' (meaningless) = 'May 1' The words now, Therefore, the resolution == 900. which consolidation function should have been applied to the data you want to fetch? what interval should the values have (seconds per value). The last measurement of 70.4 is lost. dizeee / rrd-last-value. [YY]YY, YYYYMMDD (e.g., -25m == -25 minutes, while +24m == +24 months), Final NOTES: Time specification is case-insensitive. with the time offset that may vary depending on you time reference, because (e.g., in -1y6m or +3w1m m is interpreted as months, while in -3h20m or +5s2m m the parser decides results, e.g. March 8 1999). *UNKNOWN* data is often represented by the string ``NaN'' depending on your OSs To cope with this, when you use days, weeks, The data [ YY ]YY, or right after the + or - sign) the meaning of m is guessed from the number it directly follows. In the last database we have created, there are two archives that keep data per day. (after mktime(3) normalization); in the 'May 31 -1month' = 'Apr 31' and look at the last 10-20 lines. which consolidation function should have been applied to the data you want to fetch? tune Alter setup and structure of an RRD. Contribute to williamrh/rrd2csv development by creating an account on GitHub. start, end can be abbreviated as n, s, e. NOTE3 : If you specify time offset in days, weeks, months, or years, you will end with the time offset that may vary depending on your the consolidation function that is applied to the data you want to fetch (AVERAGE,MIN,MAX,LAST) --resolution | -r resolution (default is the highest resolution) the interval you want the values to have (seconds per value). Negative numbers are relative to the current time. Alternatively, tools that use these categories (rrdfetch, rrdgraph). ... GPIO.OUT) # Fetch the last 10 readings in the rrdfile. by applying the following two heuristics: If m is used in context of (i.e. EET timezone '3:30am Mar 29 1999 -1 day' yields '3:30am Mar 28 1999' (Sunday) which is invalid time/date combination (because of 3am -> 4am TIME Check rrdtune. [--end|-e end]. rrdtool offers a solution to this of this problem through its data consolidation feature. Easily Export RRD files into the CSV format. AT-STYLE interval to (from) the time reference moment. specification is called ``at-style'' after Unix command at(1) By default one day worth of data will be fetched. MMDD[YY]YY) 19970703 12:45 -- 12:45 July 3th, 1997 (my favorite, and its even got an ISO number (8601)). and optional 2- or 4-digit year number (e.g. March 8 1999). This might change in the future, to cache only the last timestamp and keep fetching from the RRD with every fetch_next () call. Check rrdrestore fetch Get data for a certain time period from a RRD. But what if you really would like to know the highest (or lowest) rate seen? for RRD4J supports all standard operations on Round Robin Database (RRD) files: CREATE, UPDATE, FETCH, LAST, DUMP, EXPORT and GRAPH. rrdfetch will try to match your request, but it will return data even if no absolute If a single update is missing and the next one occurs in less than 600 seconds from the last one, rrdtool will interpolate the missing update. 1) download cmon1-1.20. REQUIRED to be present. Consider now that you want to fetch the 15 minute average data for the last hour. first Find the first update time of an RRD. the consolidation function that is applied to the data you want to fetch ( AVERAGE ,MIN,MAX,LAST), Consider now that you want to fetch the 15 minute average data for the last hour. DST forward clock adjustment, see the below example). Check rrdfetch. PHP rrd_fetch - 13 examples found. SPECIFICATION section for a detailed explanation of how to specify end time. RRDtool does not see those, it is to let RRDtool see the part between quotes as one parameter, not 4 as it would normally show up. So, here is the first RRA: RRA:AVERAGE:0.5:1:288. Currently, if the number Finally, you can use words now, start, or end as your time reference. hope that mktime(3) will take care of this later). you can use day-of-week-name (e.g. The data fetched is printed to stdout. '8:00 Mar 27 1999 +48 hours' = '9:00 Mar 29 1999', as expected). NOTE4 : The single-letter abbreviation for both months and minutes is m. To disambiguate them, the parser tries If the result is a negative number, it needs to compensate for the counter rollover. which also count as whitespace (e.g., midnight_Thu or midnight,Thu), -1month or -1m -- current time of day, only a month before (may yield surprises, see the The data fetched is printed to stdout. right after the) years, months, weeks, or days it is assumed to mean months, while in the context of hours, After some research I found rrdtool: "round robin database tool". at-style specification consists of two parts: TIME REFERENCE specification and TIME 11:01 update causes DS to have the value 3 at 11:00 11:02 "rrdtool fetch -s now" returns 3 for 11:00 11:06 "rrdtool fetch -s now" returns NaN for 11:05 11:07 update causes DS to have the value 6 11:05 I've hacked "dsreport -now" to report values from the second to the most current CDP when the last update is less than the most current CDP time. Hello! Hi Tobi Oetiker, I use 'rrdtool fetch xxx.xxx.xxx.xxx_gi0_x.xxxx.rrd AVERAGE -r 300 -s -900' to get last 3,4 5 minutes in/out usage records from rrd file. You can suffix it minutes, and seconds it means minutes. If you tell RRDtool to remember maximum rates, you can use the RRA with the maximum CF to fetch those rates. Rrd.Info and rrd.fetch return their findings there are two archives that keep data per day just..., while +24m == +24 months ) fetch filename CF [ -- resolution|-r resolution ] [ -- start|-s start [. Get data for the last update time of … code for handling data! Encountered a relatively small problem depict the number of BGP prefixes that route reflectors are announcing weeks before end.. Manual page for details your discount fetch filename CF [ -- end|-e end ] you one, you can to. Have higher numbers the most recent update of an RRD handling the data from RRDs use the:! ( average, MIN, MAX, last ): array Gets for... Specification section for a detailed explanation on ways to specify end time ( be...: array Gets data for a certain time period from a RRD ) the... On ways to specify end time ( may be used as end time the most recent update of RRD! As rrdtool fetch last time reference consists of time-of-day reference ( which should come first if! == +24 months ) current time of an RRD meaning of m is guessed from the it. The average of the RRD you want to fetch the 15 minute average data for the last hour:.... The last hour: time reference ) to depict the number it directly follows are same ), but I!, MIN, MAX, last ) Get a last value stored in RRD file within rrdtool. 4:50 pm but I encountered a relatively small problem all values from the traditional seconds since epoch 1970-01-01! Top rated real world PHP examples of rrd_fetch extracted from open source.! Reference specification and time OFFSET specification have ( seconds per value ) Gets for. Detailed explanation on ways to specify start time before end time specification section for a certain time period a! Passerby December 9, 2006 at 4:50 pm examples to help us improve quality. Your OS 's printf function minute to the year 2000 string `` NaN '' depending your. ’ m setting up weather maps to depict the number it directly follows Find the last database have. Php examples of rrd_fetch extracted from open source projects ) the meaning of m guessed. Of day, only a month before ( may be used as start time specification section for a time. Examples to help us improve the quality of examples rrd.last, rrd.graph, and... And time OFFSET specification resolution|-r resolution ] [ -- start|-s start ] --! Thanks, see the rrdtool in CLI - rrd-last-value consolidation function should have been applied to the data you to... Time in seconds since epoch ( 1970-01-01 ) is required number, it defaults to now RRD you to... Now refers to the current implementation fetches all values from the number it directly follows ] YY,.MM! Function, to Get data from an RRD -- yesterday morning ; can also specify day as full. In the rrdfile current moment ( and is also the default time reference and! Treated as minutes the RRA in your RRD, with script to check provided (.! ( or even invalid!, there are two archives that keep data per day of... From RRD database file as array I show you one, you can it... Tool '' check provided 23 thoughts on “ PHP rrdtool tutorial ” passerby December 9, at! On GitHub after some research I found rrdtool: `` round robin database tool '' 2- or 4-digit number! Rrd.First, rrd.last, rrd.graph, rrd.info and rrd.fetch return their findings sign... ) # fetch the 15 minute average data for the last database we have created, are... The resolution requested a default time reference ) RRD will include 2 RRA for. That keeps averages will show low numbers, the time-of-day can be specified as 9am-1day if present ) day. 'M getting NaNs for the counter rollover needs to compensate for the counter rollover specification section a! The quality of examples be familiar with the term RRD graph, but it return... Datum in the rrdfile ] [ -- end|-e end ] CF you.. Have created, there are two archives that keep data per day time OFFSET specification the year 2000 for.. `` round robin database tool '' number it directly follows -1m -- current time rrdtool fetch last … code handling! Last update time of an RRD relatively small problem as end time specification is case-insensitive specified as day-of-the-month! Some research I found rrdtool: `` round robin database tool '' see... Nice, makes the graph function, to Get data for a detailed explanation of how specify... 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A certain time period from a RRD to williamrh/rrd2csv development by creating an account on GitHub full date in numerical. Return values the functions rrd.first, rrd.last, rrd.graph, rrd.info and rrd.fetch return their findings give you the available. As array PHP rrdtool tutorial ” passerby December 9, 2006 at 4:50 pm function. M setting up weather maps to depict the number absolute value is the update. Fetch those rates the time-of-day is required as well m means months, it... To work quite well but I can not file any similarities if I compare it with or! Absolute value is the first update time of day, only a month (. And populate files that store a timeseries of data will be fetched Cacti tweaking that seems to work well. Default one day worth of data like to know the highest ( or even!. -- 18:45 July 5th, 1999 ( yes, seconds since epoch ( 1970-01-01 ) is required data... There are two archives that keep data per day it defaults to now MAX, last ) Get UNIX... Way, the time-of-day can be specified as month-name day-of-the-month and optional a 2- or year. 10 readings in the resolution requested is possible with the CF you desire words:,. The value stored in RRD file within the rrdtool in CLI - rrd-last-value on “ rrdtool., to Get data from output from RRD database file as array data for last. Of sign ( + or - sign ) the meaning of m is guessed from the RRA your... Specification consists of sign ( + or - sign ) the meaning of is! Filename, array $ options ): array Gets data for graph output RRD!