When I create a 50G zvol, it gets "volsize" 50G, and it gets "used" and "refreservation" 51.6G
I have some filesystems already in use, hosting VM's, and I'd like to mimic the refreservation setting on the filesystem, as if I were smart enough from the beginning to have used the zvol. So my question is ... What's the extra 1.6G for? And If I have a filesystem holding a single VM with a single 2T disk, how large should the refreservation be? If it's a linear scale, it should be 2.064T refreservation.
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