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Storage Space shows "reduced resiliency" warning, build 14393
(Dell XPS 8500, 24GB, 1GB mSata system drive, two Toshiba USB3.0 attached hard drives)
I have a storage space set up on my Windows 1607 primary computer. (Storage Spaces is a feature of Windows 8.1 and later and Server 2012 and later.) It is set up with a normal pair of large capacity hard drives and is in two-way mirrored configuration, formatted ReFS. I see the "reduced resiliency warning" but both drives are marked as "OK." What is the meaning of the "reduced resiliency" warning and what is required to remove it"? I get the same warning with a similar storage space configuration on my test box, the only difference being that it is formatted NTFS.
(posted also in Microsoft Communities)