Microsoft Storage Spaces Is Hot Garbage For Parity Storage
I love parity storage. Whether it’s traditional RAID 5/6, erasure coding, raidz/raid2z, whatever. It gives you redundancy on your data without requiring double the drives that mirroring or mirroring+stripping would require.
The drawback is write performance is not as good as mirroring+stripping, but for my purposes (lots of video files, cold storage, etc.) parity is perfect.
In my primary storage array, I use double redundancy on my parity, so effectively N+2. I can lose any 2 drives without losing any data.
I had a simple Storage Spaces mirror on my Windows 10 Pro desktop which consisted of (2) 5 TB drives using ReFS. This had four problems:
- It was getting close to full
- The drives were getting old
- ReFS isn’t support anymore on Windows 10 Pro (need Windows 10 Workstation)
- Dropbox (which I use extensively) is dropping support for ReFS-based file systems.
ReFS had some nice features such as checksumming (though for data checksumming, you had to turn it on), but given the type of data I store on it, the checksumming isn’t that important (longer-lived data is stored either on Dropbox and/or my ZFS array). I do require Dropbox, so back to NTFS it is.

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