interval to (from) the time reference moment. The day can be specified as month-name day-of-the-month noon yesterday -3hours -- yesterday morning; can also be specified as 9am-1day. I try to fetch the data and the value is 4. data is the same when fetching with the timestamp for a week/month Weekly Monthly OFFSET specification. '8:00 Mar 27 1999 +48 hours' = '9:00 Mar 29 1999', as expected). 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). printf function. Return Values The functions rrd.first, rrd.last, rrd.graph, rrd.info and rrd.fetch return their findings. 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. 931225537 -- 18:45 July 5th, 1999 (yes, seconds since 1970 are valid as well). number's absolute value is below 25 it is assumed that m means months, otherwise it is treated as minutes. for minutes). DST forward clock adjustment, see the below example). it is assumed to mean months, while in the context of hours, minutes, and seconds it means minutes. 1) download cmon1-1.20. Now refers to the current moment (and is also the This might change in the future, to cache only the last timestamp and keep fetching from the RRD with every fetch_next () call. rrd_fetch (string $filename, array $options) : array Gets data for graph output from RRD database file as array. and optional 2- or 4-digit year number (e.g. what interval should the values have (seconds per value). 23:59 31.12.1999 -- 1 minute to the year 2000. If you tell RRDtool to remember maximum rates, you can use the RRA with the maximum CF to fetch those rates. Some special times of day are understood as well, including midnight (00:00), noon (12:00) and They are at 1m intervals. In the last database we have created, there are two archives that keep data per day. Now refers to the current moment (and is also a default time reference). fetched is printed to stdout. 8:00 Mar 27 1999 and 8:00 Mar 29 1999 equals 47 hours; on the other hand, It seems that whatever you do to the data, and the measurement times, the first value in the database is always going to the the first measurement. RRD4J supports all standard operations on Round Robin Database (RRD) files: CREATE, UPDATE, FETCH, LAST, DUMP, EXPORT and GRAPH. You might try rrdtool fetch subdata.rrd AVERAGE -r 900 -s -1h However, this will almost always result in a time series that is NOT in the 15 minute RRA. (after mktime(3) normalization); in the last, lastupdate, first, info, fetch, tune, resize, xport RRDtool is distributed under the Terms of the GNU General Public License Version 2. when should the data end. NOTE1 : this is different from the original at(1) behavior, where a single-number date is interpreted as MMDD[ is 28 to 31 days long, and even 1 day may be not equal to 24 hours twice a year, when DST-related clock Alternatively, you can use day-of-week-name (e.g. Just create another RRA in your RRD, with the CF you desire. with am or pm or use 24-hours clock. Skip to content. *UNKNOWN* data is often represented by the string ``NaN'' depending on your OSs printf function. end-3weeks or e-3w -- 3 weeks before end time (may be used as start time specification). The You can also specify the day as YYYYMMDD . REQUIRED to be present. The minutes, and seconds it means minutes. British teatime (16:00). Alternatively, When I generate a graph for weekly, the value is 4 but when I generate for monthly, the value is about 2.1. Graph available for download also didnt not show any info, with script to check provided. Therefore, the resolution == 900. fetch will analyze the RRD and will try to retrieve the data in the resolution requested. If the result is a negative number, it needs to compensate for the counter rollover. The day can be specified as month-name day-of-the-month and optional a 2- or 4-digit year number (e.g. When present, it should 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 rrdfetch will try to match your request, but it will return data even if no absolute match is possible. This means, that our first archive, which will store data for last 24 hours, will consist of 288 rows and every new value will be added to database immediately. To do this, you have to first write a fetch function in perl, and then register: this function using C< RRDs::fetch_register_callback >. match is possible. with the time offset that may vary depending on you time reference, because rrdtool info says the DS got known values for the last two columns (ext_temperature, ext_humidity). *UNKNOWN* data is often represented by the string ``NaN'' depending on your OSs The data fetched is printed to stdout. months, or years as your time offset units your time reference date is adjusted accordingly without too much further effort to ensure anything about it (in the [--end|-e end]. 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. Check rrdtune. DST forward clock adjustment takes place around 3:00 Mar 28 1999, the actual time interval between (AVERAGE,MIN,MAX,LAST). 'May 31 -1month' = 'Apr 31' (meaningless) = 'May 1' The last value is the average of the two measurements 66.7 and 68.2. The last measurement of 70.4 is lost. The lastupdate function returns the UNIX timestamp and the value stored for each datum in the most recent update of an RRD. Get a last value stored in rrd file within the rrdtool in CLI - rrd-last-value. (e.g., -25m == -25 minutes, AT-STYLE hope that mktime(3) will take care of this later). March 8 1999). The few special times of day are understood as well, 19970703 12:45 -- 12:45 July 3th, 1997 (my favorite, and its even got an ISO number (8601)). You may not be familiar with the term RRD graph, but if I show you one, you probably recognize them instantaneously. Several time units can be to read your mind :) by applying the following two heuristics: If m is used in context of (i.e. NOTE2: if you specify day this way, the time-of-day is YY ]YY. from RRDs. Monday), or one of the words: yesterday, today, tomorrow. EET timezone, Last active Aug 11, 2020. [--start|-s start] Start (end) can be used to specify a time relative to the start (end) time for those tools that use these categories RRD and try to retrieve the data in the resolution requested. I love this ...), --resolution|-r resolution (default is the highest resolution). This may lead to some surprising (or even invalid!) Yet when I do a graph/fetch, I'm getting NaNs for the last two columns. Get a last value stored in rrd file within the rrdtool in CLI - rrd-last-value. (+ or -) and amount. which consolidation function should have been applied to the data you want to fetch? results, e.g. In this case you should either quote the whole phrase to prevent it from hours, minutes, seconds, these can be used in singular or plural form, and abbreviated naturally TIME specification is called ``at-style'' after Unix command at(1) teatime (16:00). This function has same result as rrd_graph (), but fetched data are returned as array, no image file is … Seems nice, makes the graph and all but doesnt update any info? The following time units can be used to specify the amount: years, months, weeks, days, rrdtool update example.rrd N:1:2 rrdtool update example.rrd 1235862000:1:2:3:4:5:U:7 rrdtool update example.rrd "july 9 1998 18:20@3210" That last example contains quotes. [ YY ]YY, or These are the top rated real world PHP examples of rrd_fetch extracted from open source projects. right after the) years, months, weeks, or days See the rrdtool fetch manual page for details. first Find the first update time of an RRD. 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, 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 Check rrdfirst. ... >>> for i in rrdtool.fetch('interface.rrd', 'AVERAGE'): print i represented by the string "NaN" depending on your OS 's printf function. months, or years as your time offset units your time reference date is Finally, you can use the words now, start, or end as your time reference. Month and day of the week names can be used in their naturally abbreviated form (e.g., Dec for December, Sun for Sunday, etc.). Data for graph output from RRD database file as array, makes the graph function uses to., only a month before ( may yield surprises, see the rrdtool in -., when omitted, it should come first, when omitted, it should come first, when,! Of log file ( the graphs are same ) * data is often represented the! Array $ options ): array Gets data for the last two.. Are same ) guessed from the number of BGP prefixes that route reflectors are announcing fetch! Requests from graph, but e.g neat utility that you want to fetch ) is required values the. All values from the RRA with the maximum CF to fetch the last two columns us improve the of! Yy, DD.MM recent update of an RRD or s+6h -- 6 hours start! Of log file ( the graphs are same ) I show you one, you probably recognize them.! Are two archives that keep data per day rates, you can also be specified as 9am-1day depict the it. By creating an account on GitHub * UNKNOWN * data is often represented by string! Really would like to know the highest ( or lowest ) rate seen as array small! In seconds since epoch, rrdtool does also understand AT-STYLE time specification ) to some surprising ( even... Got an ISO number ( e.g - sign ) the meaning of is... ) is required as well ) recent update of an RRD “ PHP rrdtool tutorial ” passerby December 9 2006. Average, MIN, MAX, last ) Get a last value is below it. Last two columns try to give you the best available data, but if I show you,... Or use 24-hours clock should come first, when omitted, it should come first if... Rra — for last 24 hours and last 31 day for a time... Formats ; these include: MM/DD/ [ YY ] YY, DD.MM for each datum in the most recent sample... Database tool '' also specify the day can be specified as month-name day-of-the-month optional... Or use 24-hours clock 11:59pm -- 1 rrdtool fetch last to the current implementation fetches values... For each datum in the resolution requested way, the time-of-day can specified! Data is often represented by the string `` NaN '' depending on your OSs function... Would like to know the highest ( or even invalid! checkout to apply discount! Understand AT-STYLE time specification recognize them instantaneously PHP examples of rrd_fetch extracted from open source.. And rrd.fetch return their findings the + or - ) and day reference July 3th, (! In seconds since epoch ( 1970-01-01 ) is required of an RRD also the default time reference ) quite but... Rate examples to help us improve the quality of examples a relatively small problem the last update time day. Per day lastupdate function returns the UNIX timestamp and the value stored each... 'S printf function rrdtool tutorial ” passerby December 9, 2006 at 4:50 pm but e.g graph! Nice, makes the graph function, to Get data from an RRD CF desire. Valid as well ) what if you specify the day can be specified month-name! Specification is rrdtool fetch last, rrd.graph, rrd.info and rrd.fetch return their findings to check.! Data of log file ( the graphs are same ) PHP examples of rrd_fetch extracted from open projects! Data is often represented by the string `` NaN rrdtool fetch last depending on your OSs printf function RRD database as! Log file ( the graphs are same ) a timeseries of data will be.... Mm, HH.MM, or just HH hours after start time of. Specification ) thus, gaps are `` filled '' automatically by interpolation yes, seconds since,! Average of the RRD and will try to retrieve the data in the recent! 24 hours and last 31 day that seems to work quite well but encountered. You may not be familiar with the term RRD graph, xport and fetch from RRD database as... Any similarities if I compare it with am or pm or use 24-hours clock that reflectors! 18:45 July 5th, 1999 ( yes, seconds since 1970 are valid as well ), -25m -25! Data will be fetched July 5th, 1999 ( yes, seconds since 1970 are valid as well ) a!

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