how to get real values for reclaimable memory?

due to the kind how vcenter calculates the guest active memory the values for reclaimable memory cannot be used to really reclaim that amount of memory. I have a 16 GB RAM VM and vRealize Operations 6 tells me that I can reclaim 14,4 GB of that. But if I look in the OS I see that 7 GB of RAM are being used. So I would kill that VM if I follow the recommendations. Hyperic gives good values but I would need the agent on all VMs then. Is there a way to get usable values with vRealize Operations 6


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