3.6.1 HP PolyServe Matrix Server Administration Guide (T5392-96018, August 2008)

Chapter 9: Configure PSFS Filesystems 115
Cacls.exe utility can set permissions only on the mount point folder.
Permissions applied to the mount point folder do not apply to the
underlying root directory of the mounted volume. This is by Microsoft
design.
It is possible, however, to set permissions on the root directory of a
mounted volume using either the Cacls.exe utility or Windows Explorer.
Cacls.exe. Use the cacls /m command-line switch to apply permissions.
Without this option, permissions are applied to the parent NTFS volume
mount point folder. When the /m option is used, the permissions are
applied to the child PSFS volume root directory.
Windows Explorer. Right-click the volume mount point in Windows
Explorer and then select Properties. The Type field specifies that this is a
Mounted Volume.
Click the Properties button adjacent to the Type field to see the properties
for the mounted volume. Although this Properties dialog specifies that
the filesystem is RAW, it is a PSFS filesystem. Click the Security tab to set
the permissions for the root directory of the volume.