I am new to this whole network monitoring lark but have just
installed zenoss 2.0.6 because I want to get a near real time (say
5 seconds latency) graphical representation of some statistics
coming from a custom MIB over a network.
I have my MIB working fine, I can poll it using snmpwalk and it
returns good values. I have imported my MIB into zenoss which sees
all the OIDs and names just fine, I have created data types and
data points in the template for one of my end nodes running the MIB
daemon, I have created 5 graphs to show 5 different data types.
The first two ran ok for about half and hour, then stopped. The
next two have never shown any data, the last one runs fine. I
queried the RRD database which shows 'nan's for all the values
which don't show on the graph so I can't fault the graph itself, it
appears RRD is not getting the right values. But if I query
snmpwalk using an OID copy/pasted from zenoss it works fine. Why
would this be going wrong for 4 out of 5 graphs?
On a maybe related note, for the first couple of days of running
this, the graphs (I'm on the default CPU utilization etc graphs
now) would sometimes cut out. The only way I found to start them
again was run #/etc/init.d/zenoss restart . Again the RRD Database
would be full of 'nan's in those blank periods. Is this likely
related?
On a different note, I want to change the update rate to about 5
seconds. I changed the 'SNMP Performance Cycle Interval' value for
the localhost to 5 seconds, pressed save and restarted zenoss for
good measure and nothing happened. I changed all the other values
on that page to 5 seconds too and, not suprisingly, nothing
happened. I had a quick look at the code and, although I don't
know any Python, it appears to me that it sets a variable
perfsnmpCycleInterval to '5 * 60' by default so I assume it is not
managing to set the variable to my value. Any ideas why not?
The best thing for you to check would be your $ZENHOME/log/
zenperfsnmp.log. This will give information on the SNMP collection
cycle. You can run it in the foreground with full debugging if you
want more information by running "zenperfsnmp run -v 10".
You did change the SNMP cycle time in the correct place. However,
anytime you change this value you must delete all of the RRD files
that were previously created. The reason for this is that the RRD
files are created with specific step and heartbeat values that cannot
be adjusted after creation.
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