FreeBSD 9-R pxeboot fails with 'Mounting root filesystem rw failed'...

Karl Pielorz kpielorz_lst at
Thu Mar 1 12:43:58 UTC 2012

--On 01 March 2012 11:53 +0100 egoitz at wrote:

> So I recomend you reading last mails of mine in freebsd-hackers...
> Hope it helps,
> Bye!

For what it's worth - I've resolved the issue I had (which was basically 
the system booted, but failed trying to re-mount root as RW, and hence 
wouldn't go into the installer).

The fix I did was to change the '/etc/fstab' on the Netboot server (i.e. 
the copy of FreeBSD that you're booting).

It contains:

/dev/iso9660/FREEBSD_INSTALL / cd9660 ro 0 0

Just commenting out that line, i.e.

#/dev/iso9660/FREEBSD_INSTALL / cd9660 ro 0 0

Means the boot now completes, and I get offered the "Install / Shell / Live 
CD" prompt, instead of an error about not being able to remount root.

I've yet to complete an install this way (so far we're just using a script 
to extract the new 9.x style '.txz' files).

But that little change does let us netboot correctly now, enough for what 
we need.


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