Can the physical sector size of a LUN be modified? Last updated Save as PDF Share Share Tweet Share Views:1,234Visibility:PublicVotes:1Category:ontap-9Specialty:SANLast Updated: Applies to ONTAP 9 FCP iSCSI Answer ONTAP LUNs have 4096 Bytes as physical sector size and 512 Bytes logical sector size (512e) These value cannot be altered Additional Information How to identify unaligned IO on LUNs?