[rrd-users] Re: Calculated values question

Alex van den Bogaerdt alex at ergens.op.het.net
Wed Oct 23 04:19:20 MEST 2002

On Tue, Oct 22, 2002 at 03:41:18PM -0700, Hilman, Harlan - CIDM-2 wrote:

> # run rrdtool update command with appropriate variables
> `rrdtool update routername_501.rrd N:$inoctets:$outoctets`;

possible problem #1:  "N" is "now" but that is *not* when you got the numbers.
There will be a small difference each time.  This difference will vary from
poll to poll.  This will cause jitter.

If this is the case, the next (or previous) interval would have a similar error
but in the opposite direction.  If you have multiple "too large" intervals in
a row, this means jitter is not your problem.

> The maximum rate on an OC3 should be 155.52Mbits.  Dividing this by 8 gives
> 19,440,000 or a maximum rate of 1.944e7 octets/sec.  However, 'rrdtool dump

possible problem #2:  155.52 Mbps is rounded, is payload etc.  Make sure you
are monitoring what you think you're monitoring.  Perhaps you're also seeing
the framing and signaling?


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