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Date: Thu, 1 Jul 2010 22:08:50 +0200
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From: Anders Andersson <anders.freebsd@gmail.com>
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Subject: Re: /boot is full after running "make installkernel" on FreeBSD 8.0
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>
> A healthy fear, indeed.
>
> For one thing, I'd certainly rather have someone
> do "rm /boot/kernel.old/*.ko" than "rm -r /boot/kernel.old".
>
> Being even more selective is an obvious extension...
>

Why not move the old "useless" kernel to another drive. Sure if the system
kernel fails and you need the old one, there is a little bit more work, but
nothing that I can't see be solved by:
1. booting from a livecd
2. mount the /boot and /theotherpartition
3. move the kernel back and move the faulty one away
4. reboot

That saves you from deleting the entire computer/world/Internet and save the
old kernel as well. However, I have never done this myself but the theory
sounds good.