RRDtool works with with Round Robin Databases (RRDs). It stores and retrieves
data from them.
-=head2 What data can be put into an RDD ?
+=head2 What data can be put into an RRD ?
You name it, it will probably fit. You should be able to measure some value
at several points in time and provide this information to RRDtool. If you
First of all: read it again! You may have missed something.
If you are unable to compile the sources and you have a fairly common
-OS, it will probably not be the fault of RRDtool. There may be precompiled
+OS, it will probably not be the fault of RRDtool. There may be pre-compiled
versions around on the Internet. If they come from trusted sources, get
one of those.
If on the other hand the program works but does not give you the
this document. It holds one data source (DS) named "speed" that gets
built from a counter. This counter is read every five minutes (default)
In the same database two round robin archives (RRAs) are kept, one
-averages the data every time it is read (eg there's nothing to average)
+averages the data every time it is read (e.g., there's nothing to average)
and keeps 24 samples (24 times 5 minutes is 2 hours). The other averages
-6 values (half hour) and contains 10 of such averages (eg 5 hours)
+6 values (half hour) and contains 10 of such averages (e.g., 5 hours)
The remaining options will be discussed later on.
RRDtool works with special time stamps coming from the UNIX world.
Most people will use the counter that keeps track
of octets (bytes) transfered by a network device so we have to do just
that. We will start with a description of how to collect data.
-Some people will make a remark that there are tools that can do this data
+Some people will make a remark that there are tools which can do this data
collection for you. They are right! However, I feel it is important that
you understand they are not necessary. When you have to determine why
things went wrong you need to know how they work.
Right, lets continue to the start of our OID: we had 1.3.6.1.2.1
From there, we are especially interested in the branch "interfaces"
-which has number 2 (eg 1.3.6.1.2.1.2 or 1.3.6.1.2.1.interfaces).
+which has number 2 (e.g., 1.3.6.1.2.1.2 or 1.3.6.1.2.1.interfaces).
First, we have to get some SNMP program. First look if there is a
pre-compiled package available for your OS. This is the preferred way.
interval is 297 seconds and also the counter increased with 297. Again
RRDtool alters the value and stores 300 as it should be.
- in the RDD in reality
+ in the RRD in reality
time+000: 0 delta="U" time+000: 0 delta="U"
time+300: 300 delta=300 time+300: 300 delta=300