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Date:      Wed, 15 Aug 2018 18:18:16 +0300
From:      Toomas Soome <tsoome@me.com>
To:        tech-lists <tech-lists@zyxst.net>
Cc:        Kyle Evans <kevans@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: boot errors since upgrading to 12-current
Message-ID:  <F4DFDE06-8F93-4628-A200-99878D6666DD@me.com>
In-Reply-To: <dbc7db12-70a5-b56b-bdc8-f2e6389fd5e4@zyxst.net>
References:  <f3cb9196-0e89-6c4e-5e8f-d3c4e48e16dc@zyxst.net> <22F5A9FD-3167-4029-8CFF-B4096E9E69BB@me.com> <24f2e3f5-67b3-a5ac-8394-a7b5ecd0ce39@zyxst.net> <C3AC526B-56DD-4273-A3FB-7BBB472563E5@me.com> <d93df45c-99f5-0549-1154-9fd3c62193bd@zyxst.net> <CACNAnaHogeyCytPAEwYZPE%2BU1=0rwXUx8JNu=UbPHkLUc=rZzQ@mail.gmail.com> <cc47ceab-22c2-3b87-8e88-92a314889da2@zyxst.net> <dbc7db12-70a5-b56b-bdc8-f2e6389fd5e4@zyxst.net>

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> On 15 Aug 2018, at 16:52, tech-lists <tech-lists@zyxst.net> wrote:
>=20
> On 15/08/2018 13:20, tech-lists wrote:
>> On 15/08/2018 12:49, Kyle Evans wrote:
>>> On Wed, Aug 15, 2018 at 6:22 AM, tech-lists <tech-lists@zyxst.net> =
wrote:
>>>> Hello Toomas,
>>>>=20
>>>> On 15/08/2018 07:31, Toomas Soome wrote:
>>>>>=20
>>>>> Well that does explain the problem, if you look on the sizes =
reported=E2=80=A6 so
>>>>> your BIOS is reporting wrong sizes, is unable to access whole 4TB =
space and
>>>>> the zfs reader is not getting the correct data from the disks
>>>>=20
>>>>=20
>>>> Do you know why this was not happening on 11-stable but is =
happening on
>>>> 12-current?
>>>>=20
>>>> The BIOS has not been modified since the machine was bought back in =
2014.
>>>>=20
>>>=20
>>> Perhaps r335245, which fixed a logical error and completely changed
>>> the calculations for this stuff and possibly sent you on =
dramatically
>>> different path. There's not too many commits to this area that =
haven't
>>> yet landed back in stable/11, fortunately.
>>>=20
>>> Thanks,
>>>=20
>>> Kyle Evans
>>>=20
>> Thank you Toomas and Kyle for the clarifications.
>=20
> addendum to this - installed new world and kernel r337835 and the zfs =
warning at boot seems to have disappeared. Something else odd has =
started happening though, will make a new email for it - usb keyboard no =
longer functioning at the beastie menu, but functions when boot =
completes.
>=20
>=20


The size related problem is entirely about luck - to read the pool, we =
get pool config from label, and then read MOS (meta object set), and if =
we can not read MOS, we are busted. if we can read MOS, the zfs probe in =
boot loader is happy (actual file reads is still different story). =
However, whenever the pool is changed, the MOS will get updates and its =
location can (and will) change.

rgds,
toomas




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