Guys,
This is where I am coming from, using purely common sense:
Scenario A, three identical VMs, but no identical blocks within each VM, all properly aligned, so NTFS blocks are mapped identically to WAFL blocks.
Scenario B, same VMs, vm1 properly aligned, vm2 has 1k offset & vm2 has 2k offset, so NTFS blocks from each VM are mapped in a different way to WAFL blocks.
Scenario A should give 3:1 de-dupe savings, whilst scenario B will give no savings, as NTFS blocks will be "chopped" from a different starting point in the case of each VM (unless purely by chance some aligned blocks will get identical 'twins' from miss-aligned ones).
Am I missing something?
Regards,
Radek