[mrtg] Monitoring SAN containing McData switches

[Daihl, Richard L (Rick)]

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I use MRTG 2.10.15 and RRD 1.0.49 to monitor read/write traffic on a few
thousand SAN ports across about 40+ SANs.

I extract the transmit and receive statistics for each port on the
switch and stuff them into an rrd.   These statistics are

classified as Counter64 coming out of the switch.   I know this because
I did an snmpbulkget on the switch.  I did an

rrdtool dump of an .rrd file and noticed that rrd saves the data in
Counter format.   The question is does MRTG and RRD

handle Counter64 correctly?

=20

I see some anomilies like the following:


'Daily' graph (5 Minute Average)


=20


'Weekly' graph (30 Minute Average)


=20


'Monthly' graph (2 Hour Average)


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'Yearly' graph (1 Day Average)


=20

=20

This port is a port that has no traffic currently on it and hasn't had
any for some time.   Yet I get the above graphs

generated.    This happens randomly around the SAN network and usually
on ports with little or no traffic.

=20

This runs on a Sun 490 4 way running Solaris 9 with gig interfaces.   I
run a separate task per switch.    I use 14all.cgi

version 1.1p25 to re-draw the graphics on demand.

=20

Does anyone have any ideas about what is going here?=20




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