Indeed, many people believe that source code being available somehow magically makes things non-proprietary. Not sure where that belief came from. An API is proprietary when it 1. Doesn't comply with existing standards, 2. Isn't interoperable, and 3. Is controlled by a single entity.
>multiple vendors
It comes from IBM/RedHat - a single commercial entity, not “thousands of independent contributors”. But yes, if it was a proper community project then it of course wouldn’t be proprietary.
>twice the throughput
Compared to NBD which can’t use RDMA at all. Again: the idea is old and not bad, it’s just that this particular implementation looks like another case of NIH.
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