Authentication and file access is controlled by the file system trustees and rights that you set from the merged view. Users do not have direct access to the secondary volume.
Explicit trustee settings for files and folders are stored in both volumes.
Inherited trustee rights are calculated and enforced based on the trustee settings for the folders on the primary volume. The primary folder tree contains instances of the folders on the secondary volume in order to support this function.
File system attributes are enforced by the NSS file system. For NSS on Linux, the Read Only, Read/Write, Execute, and Hidden attributes are available.