For all flash storage NetApp AFF model, question about DiskRaidInfo of storage-get_iter API

In cmode  storage-get_iter, we can get DiskRaidInfo about the disk. Does this DiskRaidInfo has the similar meaning for SSD NetApp storage device?

I saw the effective-disk-type can be "SSD" in DiskraidInfo, Then 

what is the meaning of used_blocks and physical_blocks in the DiskRaidInfo for a all SSD NetApp storage?