When you create a LUN, it can be accessed only with the iSCSI or FCP protocol by default. However, you can use NAS protocols to make a LUN available to a host if the NAS protocols are licensed and enabled on the storage system. The usefulness of accessing a LUN over NAS protocols depends on the host application.
Note: A LUN cannot be extended or truncated using NFS or CIFS protocols.
Even if you make a LUN available over NAS protocols, file permissions and ACL entries still apply.
Determine whether you want to read, write, or do both to the LUN over a NAS protocol, then select one of the following options from the drop-down menu:
all—If you want to write to a LUN using a NAS protocol, you must take the LUN offline or unmap it to prevent an iSCSI or FCP host from overwriting data in the LUN.
none—This is the default setting.
read—If you only want read access using a NAS protocol, the LUN can remain online.
write—If you want to write to a LUN using a NAS protocol, you must take the LUN offline or unmap it to prevent an iSCSI or FCP host from overwriting data in the LUN. Granting write access implicitly also grants read access, so choosing write is effectively the same as choosing all.