From:	CRDGW2::CRDGW2::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX"  8-DEC-1989 01:54
To:	MRGATE::"ARISIA::EVERHART"
Subj:	Re: OS-wars:  Unix file system(s)

Received: From TGV.COM by CRVAX.SRI.COM with TCP; Thu,  7 DEC 89 22:32:10 PDT
Date:     Thu, 7 Dec 89 22:28:38 PST
From: adelman@TGV.COM (Kenneth Adelman)
Reply-To: Adelman@TGV.COM (Kenneth Adelman)
Message-Id: <891207222838.20200069@TGV.COM>
Subject:  Re: OS-wars:  Unix file system(s)
To: crash!simpact!jeh@nosc.mil
Cc: info-vax@sri.com

> For what it's worth:	It IS possible to implement alternate file systems
> (on-disk structures) under VMS.  You "simply" have to write an ACP (Ancillary
> Control Process, much like the XQP, but it runs in a separate process) which
> implements it.  One such is supported by DEC and allows you to mount ODS-I
> (eg RSX-11M) disk volumes on VMS systems.  I imagine that it would be possible
> to write one that would let you mount a Unix file system as well.

    It is.  We've written an XQP to implement an NFS Client under VMS.
This allows us to remotely mount Unix filesystems on a VMS machine and
have them appear to VMS as if they were VMS filesystems.

    The great thing about the VMS filesystem is that you can mix-and-match
its components. You can add a new XQP portion but still use the old RMS.

    Witness:

$ nfsmount nfs0: drakes::"/"
%NFSMOUNT-I-MOUNTED, DRAKES::/ NFS mounted on _NFS0:
$ show device/mounted
Device			Device		 Error	  Volume	 Free  Trans Mnt
 Name			Status		 Count	   Label	Blocks Count Cnt
KAOS$DUA0:		Mounted		     0	VAXVMSRL5	195235	 250   1
NFS0:			Mounted		     0	/		  5884	   1   1
$ dire nfs0:[000000]

Directory NFS0:[000000]

.CSHRC;1		  2/2	    [DEFAULT]		  (RWED,RWED,RE,RE)
.LOGIN;1		  2/2	    [DEFAULT]		  (RWED,RWED,RE,RE)
000000.DIR;1		  3/3	    [DEFAULT]		  (RWED,RWED,RE,RE)
DEV.DIR;1		 11/11	    [DEFAULT]		  (RWED,RWED,RE,RE)
ETC.DIR;1		  6/6	    [DEFAULT]		  (RWED,RWED,RE,RE)
HOME.DIR;1		  2/2	    [DEFAULT]		  (RWED,RWED,RE,RE)
LOST$5KFOUND.DIR;1	 16/16	    [DEFAULT]		  (RWED,RWED,RE,RE)
...
(directory edited for brevity)

						Kenneth Adelman
						TGV, Incorporated