On May 30, 2015, at 18:41, Erich Dollansky <[email protected]> wrote:

> Hi,
> 
> On Sat, 30 May 2015 05:52:56 -0400
> Aryeh Friedman <[email protected]> wrote:
> 
>> My desktop machine is 11-current and I want to down grade it to
>> 10-stable how do I do this without needing a reinstall?
>> 
> 
> I did this several times from sources. Be aware of one problem which
> could be fatal. If you created a encrypted partition with GELI and you
> downgrade, the older version might not be able to handle the encryption
> of the newer version. This is not mentioned in the documentation.
> 
> There might be also a catch with the mix of kernel/world. To avoid
> problems there, I ran both the installation of kernel and the world in
> one go.

Anything that modifies on-disk metadata is a no-go for downgrades, which 
includes UFS and ZFS as well…
Cheers,
-NGie

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