Round robin database tool
It is pretty easy to gather status information from all sorts of things, ranging from the temperature in your office to the number of octets which have passed through the FDDI interface of your router. But it is not so trivial to store this data in an efficient and systematic manner. This is where RRDtool comes in handy. It lets you log and analyze the data you gather from all kinds of data-sources (DS). The data analysis part of RRDtool is based on the ability to quickly generate graphical representations of the data values collected over a definable time period.
In this man page you will find general information on the design and functionality of the Round Robin Database Tool (RRDtool). For a more detailed description of how to use the individual functions of RRDtool check the corresponding man page.
While the man pages talk of command line switches you have to set in order to make RRDtool work it is important to note that RRDtool can be remotely controlled through a set of pipes. This saves a considerable amount of startup time when you plan to make RRDtool do a lot of things quickly. Check the section on further down. There is also a number of language bindings for RRDtool which allow you to use it directly from Perl, python, Tcl, PHP, etc.
Operationally equivalent to update except for output. Check rrdupdate.
Dump the contents of an RRD in plain ASCII. In connection with restore you can use this to move an RRD from one computer architecture to another. Check rrddump.
When monitoring the state of a system, it is convenient to have the data available at a constant time interval. Unfortunately, you may not always be able to fetch data at exactly the time you want to. Therefore RRDtool lets you update the log file at any time you want. It will automatically interpolate the value of the data-source (DS) at the latest official time-slot (interval) and write this interpolated value to the log. The original value you have supplied is stored as well and is also taken into account when interpolating the next log entry.
You may log data at a 1 minute interval, but you might also be interested to know the development of the data over the last year. You could do this by simply storing the data in 1 minute intervals for the whole year. While this would take considerable disk space it would also take a lot of time to analyze the data when you wanted to create a graph covering the whole year. RRDtool offers a solution to this problem through its data consolidation feature. When setting up an Round Robin Database (RRD), you can define at which interval this consolidation should occur, and what consolidation function (CF) (average, minimum, maximum, last) should be used to build the consolidated values (see rrdcreate). You can define any number of different consolidation setups within one RRD. They will all be maintained on the fly when new data is loaded into the RRD.The best dota 2 tips, tricks and bugs! what song? What is smooth criminal meaning? What does battery cca mean? 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