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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: request: LOADER_ZFS_SUPPORT
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Miroslav Lachman wrote:
> 
> 
> Aristedes Maniatis wrote:
>> On 17/11/09 9:14 PM, Ivan Voras wrote:
> 
> [...]
> 
>> Possibly freebsd-update should be maintained as part of the release
>> process and not by someone at arm's length to the re team. In recent
>> times it has broken rebooting after an update twice: once because of the
>> above issue, and earlier when updating from 7.2 to 8.0-beta it was
>> impossible to install a new kernel, reboot and then install world. This
>> wasn't a freebsd-update specific issue (there is an incompatibility
>> between new ZFS kernel modules and old userland tools), but it will bite
>> everyone using freebsd-update and ZFS.
> 
> If we are talking about freebsd-update... It would be nice if 
> freebsd-update leave old kernel available in /boot/ as with source 
> upgrade (/boot/kernel.old) at least until second reboot (in case of 
> upgrade), because if new kernel failed to boot after first reboot, then 
> the machine become unbootable without some kind of LiveFS media.

Are you sure it still doesn't do that? I think I saw a recent patch that 
leaves kernel.old somewhere...