diff --git a/doc/rrdcreate.pod b/doc/rrdcreate.pod
index abb42fc977a6fab48dc34ec240e723bb7b16e5d0..3e6451db006f162087ffbc9013cc3b91f50cfb86 100644 (file)
--- a/doc/rrdcreate.pod
+++ b/doc/rrdcreate.pod
B<rrdtool> B<create> I<filename>
S<[B<--start>|B<-b> I<start time>]>
S<[B<--step>|B<-s> I<step>]>
+S<[B<--no-overwrite>]>
S<[B<DS:>I<ds-name>B<:>I<DST>B<:>I<dst arguments>]>
S<[B<RRA:>I<CF>B<:>I<cf arguments>]>
Specifies the base interval in seconds with which data will be fed
into the B<RRD>.
+=head2 B<--no-overwrite>
+
+Do not clobber an existing file of the same name.
+
=head2 B<DS:>I<ds-name>B<:>I<DST>B<:>I<dst arguments>
A single B<RRD> can accept input from several data sources (B<DS>),
data source is assumed to be I<*UNKNOWN*>.
I<min> and I<max> define the expected range values for data supplied by a
-data source. If I<min> and/or I<max> any value outside the defined range
+data source. If I<min> and/or I<max> are specified any value outside the defined range
will be regarded as I<*UNKNOWN*>. If you do not know or care about min and
max, set them to U for unknown. Note that min and max always refer to the
processed values of the DS. For a traffic-B<COUNTER> type DS this would be
more than B<half> the "step", the entire PDP is marked
as "unknown". This means that a mixture of known and "unknown" sample
times in a single PDP "step" may or may not add up to enough "known"
-time to warrent for a known PDP.
+time to warrant a known PDP.
The "heartbeat" can be short (unusual) or long (typical) relative to
the "step" interval between PDPs. A short "heartbeat" means you
=item Mail Messages
Assume you have a method to count the number of messages transported by
-your mailserver in a certain amount of time, giving you data like '5
+your mail server in a certain amount of time, giving you data like '5
messages in the last 65 seconds'. If you look at the count of 5 like an
B<ABSOLUTE> data type you can simply update the RRD with the number 5 and the
end time of your monitoring period. RRDtool will then record the number of