[namibj]

That's kind of that ZNS is for: make the SSD dumb but in exchange predictable; let the database on top that already uses some type of CoW structure handle the quantization of erasure blocks; expose all overprovisioning from the start and just give back less usable capacity after an erasure block for erased and skip over any read access sized blocks that got killed off there when mapping logical addresses to physical ones. That has to exist anyways because due yield reasons some percentage of blocks is expected dead from the factory.