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Ext File Specs, Using, Directory Specification Differences, Deep Directory Structures
 *Conan The Librarian 

    OpenVMS 7.2 and later supports deep nesting of up to 255
    directories with the restriction that the total directory
    specification must be no longer than 512 8-bit or 16-bit
    characters.

    For example, a user can create the following directories on an
    ODS-2 or ODS-5 volume:

    $ CREATE/DIRECTORY [a.b.c.d.e.f.g.h.i.j.k.l.m]

    A user can create the following directory with a long name on an
    ODS-5 volume:

    $ CREATE/DIRECTORY -
    [.AVeryLongDirectoryNameWhichHasNothingToDoWithAnythingInParticular]
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