Hi,
I'd like to make sure first that you're getting the 'Global Memory' and 'Global Memory Used' stats, using the Performance View associated with the F5 Management Pack itself. In the SCOM Operations Console please go to Monitoring >> F5 Networks >> All Devices >> Diagram View >> select your F5 device >> right click >> Open >> Performance View >> check the 'Global Memory' and 'Global Memory Used' stats >> refresh the view a few times within a minute >> you should be getting the stats plotted.
If you don't see any stats coming in, the next questions would be:
1. Do you have any rule overrides defined for these stats? If yes, please zip and send your override pack to managementpack(at)f5(dot)com, so we can take a closer look to it.
2. What is the version of the F5 Management Pack you're using? (regedit >> HKLM >> Software >> F5 Networks >> Management Pack >> Version)
3. What is the F5 device platform version you're monitoring with the F5 Management Pack?
Let us know.
Julian