Re: Set ZFS pool ashift=14 for FreeBSD root pools?

>> 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

Something like that:

1. Boot with FreeBSD-15.0-RELEASE-amd64-disc1.iso ISO.

2. Select [Live CD] option.

3. Login as 'root' and hit [ENTER] on password question.

4. Get network connection (LAN or WiFi).

5. Set needed ASHIFT.

# sysctl vfs.zfs.vdev.min_auto_ashift=14

6. Download verimg(8) tool.

# fetch https://raw.githubusercontent.com/vermaden/verimg/refs/heads/master/verimg

7. Use gpart(8)/zpool(8)/zfs(8) tools to create your partitions.

# grep '^[^#]' misc/git.verimg/verimg | grep -v __m | grep -e 'zpool create' -e 'zfs create' -e 'gpart ' -e 'zpool import'
  gpart create -s GPT                                   ${DEVICE}
  gpart add -a 4k -s 512K -t freebsd-boot -l gptboot0   ${DEVICE}
  gpart add -a 4k -s 40M  -t efi          -l efiboot0   ${DEVICE}
  gpart add -a 4k -s 1G   -t freebsd-swap -l swap0      ${DEVICE}
  gpart add -a 4k -s 8G   -t freebsd-zfs  -l zfs0       ${DEVICE}
  gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ${DEVICE}
    if ! zpool create -R "${ARG_MNTD}" -O compress=lz4 -O atime=off -m none -f ${ARG_POOL} "${DEVICE}p4" 2> /dev/null
    zfs create -o mountpoint=none                          ${ARG_POOL}/ROOT
    zfs create -o mountpoint=/                             ${ARG_POOL}/ROOT/default
    zfs create -o mountpoint=/home                         ${ARG_POOL}/home
    zfs create -o mountpoint=/tmp -o exec=on -o setuid=off ${ARG_POOL}/tmp
    zfs create -o mountpoint=/usr -o canmount=off          ${ARG_POOL}/usr
    zfs create -o setuid=off                               ${ARG_POOL}/usr/ports
    zfs create                                             ${ARG_POOL}/usr/src
    zfs create -o mountpoint=/var -o canmount=off          ${ARG_POOL}/var
    zfs create -o exec=off -o setuid=off                   ${ARG_POOL}/var/audit
    zfs create -o exec=off -o setuid=off                   ${ARG_POOL}/var/crash
    zfs create -o exec=off -o setuid=off                   ${ARG_POOL}/var/log
    zfs create -o atime=on                                 ${ARG_POOL}/var/mail
    zfs create -o setuid=off                               ${ARG_POOL}/var/tmp


8. As ZFS pool will be mounted at /mnt use verimg(8) to install FreeBSD like that:

# sh verimg -M setup -t mnt -R /usr/freebsd-packages/offline
INFO: options that will be used
  ARG_MODE: setup
  ARG_TYPE: mnt
  ARG_FILE: -
  ARG_SIZE: -
  ARG_VERS: releng/15.0
  ARG_INST: beadm:lsblk
  ARG_MNTD: /mnt
  ARG_SRCD: /usr/src
  ARG_KERN: GENERIC
  ARG_POOL: sys
  ARG_REPO: /usr/freebsd-packages/offline
  ARG_BRCH: latest

9. You should have FreeBSD installed.

Regards,
vermaden