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Why use snap reserve in a flexvol?

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Is there any reason to define snap reserve space in a "thick" provisioned flexvol?  

 

In our PROD environment we use autosize (mode: grow) and have autodelete configured for snapshots.  By default we create our flexvols with 20% snap reserve.  I'm noticing that this is resulting in a lot of unused space.

 

I have found that 0% snap reserve is recommended for "thin" provisioned volumes and for volumes that contain LUNs.  

 

Thank you.


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