diff --git a/doc/rrdtool.pod b/doc/rrdtool.pod
index 154afe7a356501a7fb10d41aa2e0b75a03dbc626..0d701ca4a420818fd431cb47c57d1b40e222ea9a 100644 (file)
--- a/doc/rrdtool.pod
+++ b/doc/rrdtool.pod
saves a considerable amount of startup time when you plan to make
B<RRDtool> do a lot of things quickly. Check the section on L<Remote_Control>
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.
+for RRDtool which allow you to use it directly from Perl, python, Tcl,
+PHP, etc.
=over 8
=item B<xport>
-Export data retrieved from one or several RRDs. Check L<rrdxport>
+Export data retrieved from one or several RRDs. Check L<rrdxport>.
+
+=item B<flushcached>
+
+Flush the values for a specific RRD file from memory. Check L<rrdflushcached>.
=item B<rrdcgi>
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 B<RRDtool> lets you update the logfile at any time you
+to. Therefore B<RRDtool> lets you update the log file at any time you
want. It will automatically interpolate the value of the data-source
-(B<DS>) at the latest official time-slot (intervall) and write this
+(B<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.
B<s:>I<systemtime>. Both values are the running totals of seconds since
RRDtool was started. If an error occurs, a line of the form 'C<ERROR:>
I<Description of error>' will be printed instead. B<RRDtool> will not abort,
-unless something realy serious happens. If
+unless something really serious happens. If
a B<workdir> is specified and the UID is 0, RRDtool will do a chroot to that
workdir. If the UID is not 0, RRDtool only changes the current directory to
B<workdir>.
Don't forget to create the database directory /var/rrd and
reinitialize your inetd.
-If all was setup correctly, you can access the server with perl
+If all was setup correctly, you can access the server with Perl
sockets, tools like netcat, or in a quick interactive test by using
'telnet localhost rrdsrv'.
B<NOTE:> that there is no authentication with this feature! Do not setup
such a port unless you are sure what you are doing.
+=head1 RRDCACHED, THE CACHING DAEMON
+
+For very big setups, updating thousands of RRD files often becomes a serious IO
+problem. If you run into such problems, you might want to take a look at
+L<rrdcached>, a caching daemon for RRDtool which may help you lessen the
+stress on your disks.
+
=head1 SEE ALSO
-rrdcreate, rrdupdate, rrdgraph, rrddump, rrdfetch, rrdtune, rrdlast, rrdxport
+rrdcreate, rrdupdate, rrdgraph, rrddump, rrdfetch, rrdtune, rrdlast, rrdxport,
+rrdflushcached, rrdcached
=head1 BUGS