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Date:      Fri, 6 Sep 2024 16:28:31 -0600
From:      Alan Somers <asomers@freebsd.org>
To:        Chris Ross <cross+freebsd@distal.com>
Cc:        Wes Morgan <morganw@gmail.com>, FreeBSD Filesystems <freebsd-fs@freebsd.org>
Subject:   Re: Unable to replace drive in raidz1
Message-ID:  <CAOtMX2iV7bG7E-uOOVsFVEzO7CDhRfHm12Y40EEQ25FYGxHFJA@mail.gmail.com>
In-Reply-To: <E22575F4-8731-471A-A714-D391BD043FA8@distal.com>
References:  <5ED5CB56-2E2A-4D83-8CDA-6D6A0719ED19@distal.com> <AC67D073-D476-41F5-AC53-F671430BB493@distal.com> <CAOtMX2h52d0vtceuwcDk2dzkH-fZW32inhk-dfjLMJxetVXKYg@mail.gmail.com> <CB79EC2B-E793-4561-95E7-D1CEEEFC1D72@distal.com> <CAOtMX2i_zFYuOnEK_aVkpO_M8uJCvGYW%2BSzLn3OED4n5fKFoEA@mail.gmail.com> <6A20ABDA-9BEA-4526-94C1-5768AA564C13@distal.com> <CAOtMX2jfcd43sBpHraWA=5e_Ka=hMD654m-5=boguPPbYXE4yw@mail.gmail.com> <0CF1E2D7-6C82-4A8B-82C3-A5BF1ED939CF@distal.com> <CAOtMX2hRJvt9uhctKvXO4R2tUNq9zeCEx6NZmc7Vk7fH=HO8eA@mail.gmail.com> <29003A7C-745D-4A06-8558-AE64310813EA@distal.com> <42346193-AD06-4D26-B0C6-4392953D21A3@gmail.com> <E6C615C1-E9D2-4F0D-8DC2-710BAAF10954@distal.com> <E85B00B1-7205-486D-800C-E6837780E819@gmail.com> <E93A9CA8-6705-4C26-9F33-B620A365F4BD@distal.com> <50B791D8-F0CC-431E-93B8-834D57AB3C14@gmail.com> <E50559CA-CC3D-45AE-82D7-172270BF4851@distal.com> <CAOtMX2ihPqe9w%2BhbZ=GqOcmmN%2B8y9-%2Bqyew9CfZV9ajpGHZmXA@mail.gmail.com> <E22575F4-8731-471A-A714-D391BD043FA8@distal.com>

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On Fri, Sep 6, 2024 at 4:22=E2=80=AFPM Chris Ross <cross+freebsd@distal.com=
> wrote:
>
>
>
> > On Sep 6, 2024, at 18:02, Alan Somers <asomers@freebsd.org> wrote:
> > Another user reports the same error message.  In their case, it's an
> > inappropriate error message from /sbin/zpool.  Can you try a "zpool
> > status -v" and "diskinfo -f /dev/da10"?  That will show you if you
> > have the same problem.  If your pool has a 512B block size but the new
> > disk is 4kn, then you cannot use it as a replacement.
> >
> > https://github.com/openzfs/zfs/issues/14730
>
> Yeah, I came across that in my searching.  Although, I thought people
> had found success adding =E2=80=9C-o ashift=3D9=E2=80=9D to the replace c=
ommand.
> I can confirm that this raidz1 is ashift=3D9, and the disks in it 512
> byte sectorsize.  The other two raidz=E2=80=99s are ashift=3D12.
>
> diskinfo shows 512 as sectorsize for one of the older disks
> (matching model to the removed da3), and 4096 sectorsize
> for the new disk.
>
> Is this totally impossible?  I know I have replaced smaller disks with
> much larger ones in the past, though it=E2=80=99s been a few years and
> I don=E2=80=99t remember the details.  Is there really no way to put a 4k
> block disk in a set with 512 byte blocks?  I thought they were still
> able to =E2=80=9Cact=E2=80=9D like 512-byte block disks?  (512e)
>
>                - Chris

If it's a 4kn disk, then what you ask for is impossible.  If it's
512e, then it should've already worked.  With diskinfo, a 512e disk
will have 512 sectorsize and 4096 stripesize.  A 4kn disk will show
4096 sectorsize.  If you cannot obtain a 512n or 512e disk, then I'm
afraid that you'll have to recreate your whole pool.

-Alan



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