SQL performance data is not getting collected in DB DW.

Hi,

In our environment, we have 3 node windows cluster on which 2 node sql instances are hosted. One SQL instance is default and other is named. SQL perfmon counters in one of the three nodes is available while SQL perfmon counters in other two nodes is unavailable. I need to have report data for Memory Manager: Target / Total Memory for named as well as default instance. We have created a performance rule but is still unable to store the data.  

http://blogs.msdn.com/b/boris_yanushpolsky/archive/2007/11/21/opsmgr-sp1-creating-rules-and-monitors-for-multi-instance-components.aspx 

I have checked above mentioned blog and given the following details:

Object: $Target/Property[Type="MicrosoftSQLServerLibrary631730!Microsoft.SQLServer.DBEngine"]/PerformanceCounterObject$:Memory Manager
Counter:Target Server Memory (KB) 
Instance: Include All

Now after performing all such things, I am unable to get the data. Please help me on this. 

Please let me know the actual workflow how agent picks up data from server and send the data from server to MS and then MS to DB.

Thanks for the help !!!