You can specify a Windows user for a quota using one of three formats: the Windows name in pre-Windows 2000 format, the SID, or a file or directory owned by the SID of the user.
For Data ONTAP to obtain the SID from the ACL, the ACL must be valid.
If the file or directory exists in a UNIX-style qtree, or if the storage system uses UNIX mode for user authentication, Data ONTAP applies the user quota to the user whose UID, not SID, matches that of the file or directory.
Specifying a file or directory name to identify a user for a quota does not cause Data ONTAP to apply a quota to that file or directory.