unraid 6.5.0 is cacheing nearly all of my system memory/ram


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I don't quite understand what the cache means in terms of how much ram is being used.  I have 16GB of memory in my unraid system.  It reports ~2.65GB used, ~12.64GB cached, with a few hundred megabytes free.  Why is it cache'ing almost all of my memory?  Is this normal?  What does it mean? 

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