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Full Discussion: RRD graph explain
Special Forums IP Networking RRD graph explain Post 302399056 by Scott on Friday 26th of February 2010 06:34:13 AM
Old 02-26-2010
Hi.

You can find the step using:

Code:
rrdtool info yourdbname.rrd | grep step

If the step is 300 (5 minutes) then rrdtool will average data (or whatever consolidation function your db is created with) given over any five minute period.

Unless I'm mistaken, the only way to change the step is to:
Code:
rrdtool dump yourdbname.rrd > yourdbname.xml
(edit the XML file)
rrdtool restore yourdbname.xml yourdbname.rrd

This link explains quite well how the step works.

Of course, this is all on the understanding that they provided you with the RRD database file, and not just the PNG graph file.
This User Gave Thanks to Scott For This Post:
 

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RRDFLUSHCACHED(1)						      rrdtool							 RRDFLUSHCACHED(1)

NAME
rrdflushcached - Flush the values for a spcific RRD file from memory. SYNOPSIS
rrdtool flushcached [--daemon address] filename [filename ...] DESCRIPTION
The flushcached function connects to rrdcached, the RRD caching daemon, and issues a "flush" command for the given files. The daemon will put the files to the head of the update queue so they are written "soon". The status will be returned only after the files' pending updates have been written to disk. filename The name(s) of the RRD file(s) that are to be written to disk. --daemon address Address of the rrdcached daemon. If not specified, the RRDCACHED_ADDRESS environment variable must be set (see below). For a list of accepted formats, see the -l option in the rrdcached manual. rrdtool flush --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd ENVIRONMENT VARIABLES
The following environment variables may be used to change the behavior of "rrdtool flushcached": RRDCACHED_ADDRESS If this environment variable is set it will have the same effect as specifying the "--daemon" option on the command line. If both are present, the command line argument takes precedence. AUTHOR
Florian Forster <octo at verplant.org> 1.4.8 2013-05-23 RRDFLUSHCACHED(1)
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