What puzzled me is how you feel layers of particularly COW operations combine to make a dramatic increase in write load. I expect the whole block writing requir

What puzzled me is how you feel layers of particularly COW operations combine to make a dramatic increase in write load. I expect the whole block writing requirement of the SSD would be the major and finally unavoidable multiplier of its write load. Unless its blocks are small. There seems to be only a dramatic increase involved if one of the layers has dramatically larger blocks. There would be a middling chance of doubling writes between layers due to block misalignments and overlap, but that will not occur constantly and doubling is the worst case from misalignment. The most significant write multiplication throughout the layers should be the biggest block size as I imagine it.