Re: Set ZFS pool ashift=14 for FreeBSD root pools?
Alan Somers <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.hackers |
|---|---|
| Message-ID | <CAOtMX2i7oJPSHYaXVva1D0oZ_WL3__zfKnaqiWj1menD7aG5ZA@mail.gmail.com> |
On Tue, May 12, 2026 at 8:46 AM Lionel Cons <[email protected]> wrote: > > On Tue, 12 May 2026 at 12:51, vermaden <[email protected]> wrote: > > > > > How can I set the ZFS pool ashift for root pools > > > to a value like 14 (for FreeBSD inside a VM)? > > > > > > Lionel > > > > > > > > This has to be done before ZFS pool creation and it can be set like that: > > > > # sysctl vfs.zfs.min_auto_ashift=14 > > How can I do this at install time for all root pools? > > Lionel I don't know how to do it if you use the vanilla install CD. Maybe you could boot the install CD, exit to a shell, set the sysctl, and reenter the TUI. But if you have lots of machines to install, you might consider spinning a custom CD, and if you do that then you can easily set the sysctl or set "-o ashift=14" in ZFSBOOT_BOOT_POOL_CREATE_OPTIONS. See the SCRIPTING section of bsdinstall(8) for details.