Does anyone know of commercial products attaching via VFS?

[Tom Buskey]

Kevin D. Clark wrote:
> Bill Freeman writes:
> 
> 
>>    Has anyone heard of commercial products (alternate filesystems)
>>that attach through the VFS switch?  Linux or other *nix?  I'm
>>pretty sure that ClearCase works this way.  Can anyone confirm
>>this?  Anything else?

I think reiserfs attaches this way?  Development of the GPLed version is 
supported by commercial sales of reiserfs with a different license.  I 
think that qualifies.

Solaris has a VFS type system also.