lun monitoring

Russell Adams RLAdams at AdamsInfoServ.Com
Tue Feb 3 07:08:57 CET 2009


On Mon, Feb 02, 2009 at 07:10:45PM -0700, Tom Ammon wrote:
> 
> Russell,
> 
> Cacti is pretty SNMP-centric, but in our environment that is about all 
> we are using it for anyway. I'm no cacti expert, but to me, that's the 
> beauty of it - I don't really know the inner workings of cacti, and I am 
> not a programmer or scripter, but I got it up and running pretty quickly.

SNMP is a great place to start, and very open. Its certainly more
reliable than the CIMOM implementations I see.

> I'm not sure if you would call it autodiscovery, but cacti does do an 
> snmpwalk on the devices that you specify, and the pre-built data 
> collection methods that come with it are designed for getting snmp 
> interface statistics. You can, of course, add other data collection 
> methods, but out of the box, it is basically an interface traffic 
> grapher. You still have to manually input each device that you will 
> collect data for. Once you have specified the basic host information, it 
> gives you a table showing all of the interfaces on that device and a 
> checkbox for each item that can be graphed.

Torrus is configured by feeding it a list of IP addresses and it
identifies the device and sets up all the counters to be
monitored. The detail is very good, more than just interface stats.

> To be fair, though (and this applies to nagios as well as cacti) most of 
> the effort you put in to setting up a monitoring solution is a one-time 
> thing. It takes time to input all of the devices, but for the most part 
> once the devices to be monitored are specified, that work is over. I 
> think people incorrectly place a lot of emphasis on this or that 
> product's autodiscovery function. Cacti's interface makes it really easy 
> to maintain the configuration, and I think that is a bigger win than 
> autodiscovery.

I consider autodiscovery to be absolutely critical. Maintaining a
handfull of machines is one thing, hundreds or thousands or machines
outside of your control are another. I wrote NACE to allow me to
perform fast autodiscovery for Nagios, and I've been pleased to couple
it with Torrus so they both have the same list of hosts.

> What do you mean by new device types?

Device types are essentially templates for what to monitor on a given
device. Hosts are cpu/mem/disk/net, switches might be
ports/traffic/cpu/mem/temp, etc.

Thanks.

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Russell Adams                            RLAdams at AdamsInfoServ.com

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