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After creating a file on Windows, why the owner is root and the group is bin on Linux?

Last Updated:

Applies to

  • ONTAP 9
  • CIFS
  • NFS


If the advanced CIFS server option "Map Administrators to UNIX User 'root'" (-is-admin-users-mapped-to-root-enabled) is set to true, Windows users who are members of the "BUILTIN\Administrators" group are mapped to UNIX user "root" unless they are explicitly mapped to a UNIX user.

In ONTAP, the default local UNIX user "root" on each SVM has an User ID (UID) of 0 and a primary Group ID (GID) of 1, which has the local UNIX group "daemon".  With this configuration, files created by Windows users mapped to UNIX user "root" will show as owned by UNIX user "root" (UID 0) and group "daemon" (GID 1).

For the files created by Windows users mapped to UNIX user "root", NFS clients may resolve Group ID (GID) 1 to UNIX group "bin" based on their local configuration (i.e. the "/etc/group" file or LDAP).

Additional Information

  • Map the administrators group to root
  • vserver cifs options modify
  • If a Windows user is a member of the "BUILTIN\Administrators" group and an explicit user mapping exists for that user, the explicit name mapping takes precedence.
  • The default value for this parameter is true.
  • Set parameter to false to disable mapping the Administrators group members to root.
set -privilege advanced
vserver cifs options modify -vserver vserver_name -is-admin-users-mapped-to-root-enabled false
set -privilege admin


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