Hello,
For Logical Disk Free space monitor, both
MB and % need to be exceeded, in order for a state change to occur.
In addition, here is a helpful article for your reference to only monitor % free space, please refer to it for more information:
https://social.technet.microsoft.com/wiki/contents/articles/20412.operations-manager-2012-monitoring-logical-disk-free-space.aspx
Regards,
Yan Li
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