On 14/10/2016 15:22, Alexander Motin wrote:
> On 14.10.2016 15:11, Andriy Gapon wrote:
>> On 14/10/2016 15:01, Alexander Motin wrote:
>>> Author: mav
>>> Date: Fri Oct 14 12:01:33 2016
>>> New Revision: 307317
>>> URL: https://svnweb.freebsd.org/changeset/base/307317
>>> Log:
>>>   MFV r307313:
>>>   5120 zfs should allow large block/gzip/raidz boot pool (loader project)
>>>   Reviewed by: George Wilson <george.wil...@delphix.com>
>>>   Reviewed by: Yuri Pankov <yuri.pan...@nexenta.com>
>>>   Reviewed by: Andrew Stormont <andyjstorm...@gmail.com>
>>>   Reviewed by: Matthew Ahrens <mahr...@delphix.com>
>>>   Approved by: Robert Mustacchi <r...@joyent.com>
>>>   Author: Toomas Soome <tso...@me.com>
>>>   openzfs/openzfs@c8811bd3e2427dddbac6c05a59cfe117d8fea370
>>>   FreeBSD still does not support booting from gzip-compressed datasets,
>>>   so keep one chunk of this commit out.
>> Does FreeBSD boot code support large blocks? Just to be sure.
> According to r304321 commit message -- it does now.


>> And maybe this is worth some additional notice because users sometimes 
>> forget to
>> upgrade gptzfsboot / zfsboot.
> Where would you like to see it to be noticeable?

That's a good question for which I do not have a good answer.
Ideally 'zfs set recordsize=' would warn when setting a large block size on a
boot filesystem and 'zpool set bootfs=' would warn when switching the boot
filesystem to a filesystem that already has a large block size.
But not sure if that's doable without kludges.

Andriy Gapon
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