A little more info for the (perhaps) curious:

Managing Multiple Boot Environments:
http://dlc.sun.com/osol/docs/content/2009.06/getstart/bootenv.html#bootenvmgr
Introduction to Boot Environments:
http://dlc.sun.com/osol/docs/content/2009.06/snapupgrade/index.html

- Dan Naumov



On Tue, Jun 2, 2009 at 10:39 PM, Dan Naumov <dan.nau...@gmail.com> wrote:
>
> This reminds me. I was reading the release and upgrade notes of OpenSolaris 
> 2009.6 and noted one thing about upgrading from a previous version to the new 
> one::
>
> When you pick the "upgrade OS" option in the OpenSolaris installer, it will 
> check if you are using a ZFS root partition and if you do, it intelligently 
> suggests to take a current snapshot of the root filesystem. After you finish 
> the upgrade and do a reboot, the boot menu offers you the option of booting 
> the new upgraded version of the OS or alternatively _booting from the 
> snapshot taken by the upgrade installation procedure_.
>
> Reading that made me pause for a second and made me go "WOW", this is how 
> UNIX system upgrades should be done. Any hope of us lowly users ever seeing 
> something like this implemented in FreeBSD? :)
>
> - Dan Naumov
>
>
>
>
>
> On Tue, Jun 2, 2009 at 9:47 PM, Zaphod Beeblebrox <zbee...@gmail.com> wrote:
>>
>>
>> The system boots from a pair of drives in a gmirror.  Mot because you can't 
>> boot from ZFS, but because it's just so darn stable (and it predates the use 
>> of ZFS).
>>
>> Really there are two camps here --- booting from ZFS is the use of ZFS as 
>> the machine's own filesystem.  This is one goal of ZFS that is somewhat 
>> imperfect on FreeBSD at the momment.  ZFS file servers are another goal 
>> where booting from ZFS is not really required and only marginally beneficial.
>>
>>
>
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