Deep Dive: The Storage Pool in Storage Spaces Direct

Thanks , I have some question:

1.  In the cmdlet of new-volume and new-virtualdisk,  slap size = AllocationUnit Size ?

2. AllocationUnit size is the block size in the file system of linux ?

3. In ESXI ,its datastore has a parameter: block size, usually it's 1MB,  here the block and slap is the same thing ?

4. In RHEL , in LVM , it has a term which is physical or logical extent, usually it's 4MB, here the extent and slap is the same thing ?

Slap , AllocationUnit , datastore's block , LVM's extent , if they are not the same thing , what are the difference between them?

Cosmos_Darwin, could you please help me understand those terms before I commit them into my brain.

BR