[rrd-users] Re: newbie question

[Alex van den Bogaerdt]

Justin Knash wrote:

> I'm fairly new to rrdtool, but I have been using mrtg for about a 
> year.  I'm trying to graph some gigabit uplinks on some Cisco Catalyst 
> 6509 switches.  The problem I'm running into is that I get large spikes 
> every once and a while, and my graph ends up only showing the spike, 
> and not the rest of the data.  Any ideas?

1) Define "large spike".  If the spike is below 1 Gbps it could
   be a real spike actually occuring on your network ...
2) Make sure you've set proper min and max values; use rrdtool tune
   to check and, if necessary, correct this

Existing spikes that are a result of missing max values can be
removed by setting the max value, dumping the database then restoring
it again with the -r flag.

If (1) is the case then there's nothing you can do about it without
masking the thruth from the viewer.  It is reality in that case.

If you *really*need* to lye then you could use --upper-limit and --rigid
to set a fixed, low enough, maximum to the image -or- you could do the
CDEF magic as described in the tutorial.

HTH
-- 
   __________________________________________________________________
 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
| work                                                         private |
| My employer is capable of speaking therefore I speak only for myself |
+----------------------------------------------------------------------+
| Technical questions sent directly to me will be nuked. Use the list. | 
+----------------------------------------------------------------------+
| http://faq.mrtg.org/                                                 |
| http://rrdtool.eu.org  --> tutorial                                  |
+----------------------------------------------------------------------+

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi