Date: Sat, 2 Apr 2011 09:54:16 -0600 From: Warner Losh <imp@bsdimp.com> To: perryh@pluto.rain.com Cc: freebsd-hackers@freebsd.org, m.e.sanliturk@gmail.com, avg@freebsd.org, freebsd-arch@freebsd.org Subject: Re: looking for error codes Message-ID: <CEB5BE4D-5F52-4A64-A22F-168D2BE40CEA@bsdimp.com> In-Reply-To: <4d96d545.e/wWTIUATgk2CGjt%perryh@pluto.rain.com> References: <4D95E162.40605@FreeBSD.org> <F98114A0-0C00-46EF-BD0C-E48F97FFF3E1@bsdimp.com> <AC6674AB7BC78549BB231821ABF7A9AEB52F1950BB@EMBX01-WF.jnpr.net> <4D95ECDE.1020504@FreeBSD.org> <BANLkTik_ypKnZPn1TXT6LwNH%2BX1tO2eu0w@mail.gmail.com> <4d96d545.e/wWTIUATgk2CGjt%perryh@pluto.rain.com>
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On Apr 2, 2011, at 1:50 AM, perryh@pluto.rain.com wrote: >=20 >> With respect to my knowledge , no one of the operating systems >> has a facility to separate read-only and modifiable parts ... >=20 > SunOS 4 had a partial solution to this, by rearranging the FS layout > so that /usr could be mounted read-only (and often, from a server -- > IIRC a single /usr could be shared among multiple diskless clients). > They used quite a few symlinks so that things could be found in > their accustomed places although actually located elsewhere. The > scheme was fairly well described in the SunOS 4 manual set; granted > _finding_ a SunOS 4 manual set these days may be a challenge :) FreeBSD can do this too. In fact, NanoBSD relies heavily on having most = of the system mounted read-only, and has MFS partitions for /etc and = /var. Warner
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