lun block size

Ashun

I have a question,
This KB mentions: The default disk block size for WAFL is 4k, which is equal to LUN's physical block size
But when I use lun show-fields block-size, I get a different result. Am I wrong?

KB：

Which command is used to display the physical block size of LUN? - NetApp Knowledge Base

chamfer

Hi @Ashun ,

• Traditional block size advertised by hard disks is 512 bytes.
• NetApp LUNs use a larger block size to store data while continuing to advertise smaller 512 byte blocks to the host for compatibility purposes.
• Advertised blocks are referred to as logical blocks and underlying storage block is referred to as a physical block.
• NetApp LUN stores data in 4 KB physical blocks, which yields eight 512 byte logical blocks per physical block.

Reference: https://kb.netapp.com/on-prem/ontap/da/SAN/SAN-KBs/How_to_identify_unaligned_IO_on_LUNs