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From: david@elroy.Jpl.Nasa.Gov (David Robinson)
Newsgroups: comp.unix.wizards,comp.arch
Subject: Re: R/O root (was: Jerry Pournelle on UNIX)
Message-ID: <5247@elroy.Jpl.Nasa.Gov>
Date: 19 Jan 88 01:00:20 GMT
References: <1495@osiris.UUCP> <2126@haddock.ISC.COM> <1497@osiris.UUCP> <14227@oddjob.UChicago.EDU>
Organization: Image Analysis Systems Grp, JPL
Lines: 13
Summary: SunOS 4.0

Having just recently learned of Sun's reorganizing of its disk layout
for filesystems in SunOS 4.0, they do allow you to mount both / and
/usr as read-only filesystems.  The root has been striped of all
"dynamic" or machine dependant files. Most of /etc went to either
/usr/etc or a seperate directory tree for machine specific stuff.  By
doing this the root is only 1 megabyte and may be mounted read-only.

You could put this into ROM but for other reasons I would hesitate from
doing this. As mentioned before, upgrades would be painful.
-- 
	David Robinson		elroy!david@csvax.caltech.edu     ARPA
				david@elroy.jpl.nasa.gov	  ARPA
				{cit-vax,ames}!elroy!david	  UUCP
Disclaimer: No one listens to me anyway!