What are the guidelines to be followed while increasing the size of a LUN? Last updated Save as PDF Share Share Tweet Share Views:128Visibility:PublicVotes:0Category:ontap-9Specialty:sanLast Updated: Applies to ONTAP 9 Windows Server iSCSI FC Answer LUN size can be increased without LUN offline. Rescan the LUN on the host for the host to recognize the change in size. Additional Information Resize a LUN