a new MP has been released that should fix the issue. Not tested yet.
Just a quick warning to all the SCOM admins reading. The latest OS MP (6.0.7294.0) has a serious flaw with logical disks performance collection. Basically it squares you collected perf data points for logical disks. Based on your environment this can have a huge impact on both live and data warehouse databases and potentially break reporting on logical disks. I would stay way from this MP until is is fixed.
The issue has been posted on Connect as well ((https://connect.microsoft.com/WindowsServer/feedback/details/1081666/opsmgr-os-mp-6-0-7294-0-collects-duplicate-performance-counters-for-disks)
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