Today a customer of mine run into an issue when he wanted to discover network devices with SCOM 2012. So he added the devices to the explicit discovery rule and started the discovery process immediately.
After a while he checked for the new devices in the Network Devices view (Administration, Network Management, Network Devices) and was not able to see them in this view.
So he double checked the devices in the discovery rule and started again – same problem.
As it seems, the devices are excluded from the discovery. To check that we had to export the Network Discovery Internal MP (unsealed). After that we opened it with a XML or Text editor and went <ExcludeIP> tag and usually the IPs are listed there. (Be aware that there might be several rules and each has its own exclude- list!)
We simply removed the whole line with the device IP, increment the MP version number and import the MP again.
Now we ran the discovery rule again and after a while the devices occur in the view as mentioned above.
At this time we where not able to reproduce the matter for this behavior but I assume that the devices had been deleted manually in SCOM during the testing phase what will put them into the exclude list (to be sure that they won’t be discovered again by accident).
Note: for easier following the discovery process you can filter the Operations Manager log for source OpsMgr Network Discovery. Event ID 12008 includes a summary and there you can check for the number of discovered devices as well as for the amount of excluded ones.
Update: when using Recursive Discovery (= auto-discover) you can remove those devices in the wizard of the discovery rule as well. Find them in the Exclude Filters page within the discovery rule properties.
All information is provided "as is" without any warranty! Try in lab before. Handle with care in production.
Read Full Post...
