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Date:      26 Jan 2000 00:38:35 -0600
From:      "Jeffrey S. Sharp" <jss@subatomix.com>
To:        "Greg Lehey" <grog@lemis.com>
Cc:        "freebsd-small" <freebsd-small@freebsd.org>
Message-ID:  <002201bf67c6$f76b4090$0dea5e18@mmcable.com>
References:  <3888D5CF.329989@achtung.com> <20000122145538.A390@mojave.worldwide.lemis.com> <20000124122024.A4574@horus.co.jyu.fi> <20000125103358.U2643@mojave.worldwide.lemis.com> <005f01bf66f4$05a499f0$0dea5e18@mmcable.com> <20000126075825.C42227@freebi

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Subject: Re: New approach to picobsd
Date: Wed, 26 Jan 2000 00:31:24 -0600
Organization: The Subatomix Project
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> > Another thing: using MFS for the root filesystem is bad for flash.
(A)
> > Big MFS sizes on big flash disks make memory requirements too high;
(B)
> > There is no need to make it possible for one to remove the flash
disk
> > after booting.
> > ...
> > But then there's the problem of /var and /tmp....
>
> They would need to be in mfs.  You can't get away without any writable
> file space, and you don't want to be writing to your flash all the
> time.

Therefore, I suggest something like what Warner has done (and that I am
working on as time permits), where the flash is the root fs and /tmp,
/var, and so on are mounted as small MFS filesystems.  The flash is
normally kept mounted read-only.  Then, instead of running an update
script, one simply remounts the flash read-write, makes changes, and
remounts read-only.

===============================
Jeffrey S. Sharp   (XorAxAx)
jss@subatomix.com
http://www.subatomix.com/

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