Re: sysctl: unknown oid 'vfs.zfs.min_auto_ashift'

From: Yasuhiro Kimura <yasu@FreeBSD.org>
Subject: Re: sysctl: unknown oid 'vfs.zfs.min_auto_ashift'
Date: Mon, 15 Sep 2025 13:23:21 +0900 (JST)

> I found following commit log.
> 
> commit 70999532eea5
> Merge: 5f9a05e57405 7939bad5e792
> Author:     Martin Matuska <mm@FreeBSD.org>
> AuthorDate: Wed Sep 10 17:28:34 2025 +0200
> Commit:     Martin Matuska <mm@FreeBSD.org>
> CommitDate: Wed Sep 10 17:28:34 2025 +0200
> 
>     zfs: merge openzfs/zfs@7939bad5e
>     
>     Notable upstream pull request merges:
>      #15869 ee7c36264 Add description of default sorting behavior to zfs_list.8
>      #17375 ced72fdd6 tunables: remove legacy FreeBSD aliases
>      #17600 1da2c30be Update pam_zfs_key.c default path for FreeBSD
>      #17632 b6bd3228b Synchronize the update of feature refcount
>      #17645 59f8f5dfe zfs_vnops_os.c: Add support for the _PC_CLONE_BLKSIZE name
>      #17665 0d54ae288 zdb: Fix format strings on 32-bit systems
>      #17673 976f76534 Update compatibility.d files
>      #17699 e3c3e86c0 Fix wrong dedup_table_size for legacy dedup
>      #17704 e29bfa5bd Fix warnings about sha2_is_supported on FreeBSD/i386
>      #17706 a2424312c Fix the build on 32-bit FreeBSD with GCC
>     
>     Obtained from:  OpenZFS
>     OpenZFS commit: 7939bad5e79225288a2580e8ea217f5c6f616db2
> 
> And commit ced72fdd6 actually removes vfs.zfs.min_auto_ashift.
> 
> From: Mark Millard <marklmi@yahoo.com>
> Subject: sysctl: unknown oid 'vfs.zfs.min_auto_ashift' [legacy dropped; only vfs.zfs.vdev.min_auto_ashift now]
> Date: Sun, 14 Sep 2025 16:49:16 -0700
> 
>> # uname -apKU
>> FreeBSD 7950X3D-ZFS 16.0-CURRENT FreeBSD 16.0-CURRENT main-n280292-3c60ea77649d GENERIC-NODEBUG amd64 amd64 1600000 1600000
>> 
>> It is a boot-from-ZFS-based-root context as well.
>> 
>> # sysctl -a | grep _ashift
>> vfs.zfs.vdev.max_auto_ashift: 14
>> vfs.zfs.vdev.min_auto_ashift: 12
>> vfs.zfs.vdev.file.physical_ashift: 9
>> vfs.zfs.vdev.file.logical_ashift: 9
>> 
>> 
>> So now there is just: vfs.zfs.vdev.min_auto_ashift
> 
> Thanks. I changed original line to 'vfs.zfs.vdev.min_auto_ashift=12',
> rebooted system and now error message isn't displayed.

I created patch to change bsdinstall so it uses
vfs.zfs.vdev.min_auto_ashift instead of vfs.zfs.min_auto_ashift, and
submitted as following bug report.

Bug 289615 bsdinstall/scripts/zfsboot: Use vfs.zfs.vdev.min_auto_ashift to force 4K sectors
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289615

So would someone please handle it?

Best Regards,

---
Yasuhiro Kimura