Hi
Doh myself for not explaining it...
MiB = Managment Information Base - see:
http://en.wikipedia.org/wiki/Managem...formation_base
Using SNMP - simple network monitoring protocol one can get devices to both send alerts to a central monitoring PC as well as letting the monitoring PC poll the devices to see what they are doing.
By RFC all 'grown up' devices have unique MiBs and the makers usually give these data files away with the devices or on their web sites. If you don't have the right MiB for the switch, server, router etc all you can get is a string of numbers back rom it - with the right MiB you can automagically convert the string into an English error message - viz: 'I'm too hot!! - my fan has failed!' etc.
Which, to cut a long story short, is how I knew the cpu fan on one of my 2000's had failed as I got a 'I'm too hot' message.....
and yes, on the 2000/2200's I've replaced the cpu fans with a bigger fan to keep them cool. (Remember this fan only runs when required so may take 5 mins or so to kick in after power up.)
So far I've not replaced the main psu cooling fans but it would be worth doing as cooler is always better!
See my notes in the Procooling Wiki for details on putting 1.5TB and 1TB in Snap 2000's - good luck!
Brgds
Rusty