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root directory

The typical UNIX concept of "Root Directory" is implemented in OpenVMS via the logical SYS$POSIX_ROOT. It allows access to all files and subdirectories and is automatically recognized by all C applications.

Applications can still access files outside the virtual root normally (e.g., /dka100/foo/bar), but if dka100 cannot be resolved, then SYS$POSIX_ROOT is attempted.

DECC$DISABLE_POSIX_ROOT will disable this support.

GNV
If you install GNV on your system, GNV establishes a root directory using the SYS$POSIX_ROOT concept. Generally GNV defines the root directory, pointing to its main-level directory, generally on the system disk, at:

SYS$SYSDEVICE:[VMS$COMMON.GNV.]

Within this root directory, GNV creates numerous standard UNIX directories:

bin
etc
lib
src
usr

Most of the GNV utilities are placed in /bin. GNV configuration files are place din /etc. GNV source files are in /src. Man page files are placed in /usr/share/man.