Re: SNMP - monitoring large number of devices

[Dan White <dwhite () olp net>]

On 09/29/15 22:20 +0200, Pavel Dimow wrote:
> recently I have been tasked with a NMS project. The idea is to pool about
> 20 OID's from 50k cable modems in less then 5 minutes (yes, I know it's a
> one million OID's). Before you say check out some very professional and
> expensive solutions I would like to know are there any alternatives like
> open source "snmp framework"? To be more descriptive many of you knows how
> big is the mess with snmp on cable modem. You always first perform snmp
> walk in order to discover interfaces and then read the values for those
> interfaces. As cable modem can bundle more DS channels, one time you can
> have one and other time you can have N+1 DS channels = interfaces. All in
> all I don't believe that there is something perfect out there when it comes
> to tracking huge number of cable modems so I would like to know is there
> any "snmp framework" that can be exteded and how did you (or would you)
> solve this problem.

I've done about ~60,000 OID queries (over a few dozen devices) per 5
minutes using OpenNMS, which is Java based. At the scale you're looking at,
disk I/O would be a major performance issue (if using rrdtool). Google for
'Tuning RRD' for some tips that can make a significant difference.

--
Dan White