Re: changes to the zfs boot (was: Re: git: 72a1cb05cd23 - main - rc(8): Add a zpoolupgrade rc.d script)

Quoting Warner Losh <imp@bsdimp.com> (from Wed, 9 Nov 2022 13:56:43 -0700):

> On Wed, Nov 9, 2022 at 1:54 PM Patrick M. Hausen <pmh@hausen.com> wrote:
>
>> Hi Warner,
>>
>> > Am 09.11.2022 um 21:51 schrieb Warner Losh <imp@bsdimp.com>:
>> > Yes. For safety, boot loader upgrade is mandatory when you do a zpool
>> upgrade of the root filesystem.
>> > It was definitely needed in the OpenZFS jump, and we've had one or two
>> other flag days since.
>>
>> That's a given and not a problem. What I fear from my understanding of
>> this thread so far is
>> that there might be a situation when I upgrade the zpool and the boot
>> loader and the system
>> ends up unbootable nonetheless.
>>
>> Possible or not?
>>
>
> If all you do is upgrade, then no, modulo bugs that we've thankfully not
> had yet. It's when you enable something on the zpool that you can run into
> trouble, but that's true independent of upgrade :)

Attention, "upgrade" is overloaded here. "OS upgrade" will not render  
the pool unbootable (modulo bugs), but "zpool upgrade rpool" will  
(except we have provisions that zpool upgrade doesn't enable all  
features in case the bootfs property is set).

Bye,
Alexander.

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