1. Disable Secure Boot. ZFS modules can not be loaded if Secure Boot is enabled.

  2. Download a variant of Rocky Linux 8.4 Live ISO and boot from it.

  3. Set root password or /root/authorized_keys.

  4. Start SSH server:

    echo PermitRootLogin yes >> /etc/ssh/sshd_config
    systemctl restart sshd
  5. Connect from another computer:

    ssh root@
  6. Temporarily set SELinux to permissive in live environment:

    setenforce 0

    SELinux will be enabled on the installed system.

  7. Optional: If mirror speed is slow, you can manually pick a fixed mirror from mirrorlist and apply it:

    sed -i 's|^mirrorlist=|#mirrorlist=|g' /etc/yum.repos.d/*
    sed -i 's|^#baseurl=|baseurl=|g' /etc/yum.repos.d/*
    sed -i 's|$contentdir||g' /etc/yum.repos.d/*
  8. Add ZFS repo:

    source /etc/os-release
    dnf install -y $RHEL_ZFS_REPO
  9. Install ZFS packages:

    dnf config-manager --disable zfs
    dnf config-manager --enable zfs-kmod
    dnf install -y epel-release
    dnf install -y zfs
  10. Load kernel modules:

    modprobe zfs
  11. Install helper script and partition tool:

    rpm -ivh --nodeps
    dnf install -y gdisk dosfstools
  12. Set RHEL version:

  13. Unique pool suffix. ZFS expects pool names to be unique, therefore it’s recommended to create pools with a unique suffix:

    INST_UUID=$(dd if=/dev/urandom bs=1 count=100 2>/dev/null | tr -dc 'a-z0-9' | cut -c-6)
  14. Identify this installation in ZFS filesystem path:

  15. Target disk

    List available disks with:

    ls /dev/disk/by-id/*

    If using virtio as disk bus, use /dev/disk/by-path/*.

    Declare disk array:

    DISK='/dev/disk/by-id/ata-FOO /dev/disk/by-id/nvme-BAR'

    For single disk installation, use:

  16. Choose a primary disk. This disk will be used for primary EFI partition, default to first disk in the array:

    INST_PRIMARY_DISK=$(echo $DISK | cut -f1 -d\ )
  17. Set vdev topology, possible values are:

    • (not set, single disk or striped; no redundancy)

    • mirror

    • raidz1

    • raidz2

    • raidz3


    This will create a single vdev with the topology of your choice. It is also possible to manually create a pool with multiple vdevs, such as:

    zpool create --options \
          poolName \
          mirror sda sdb \
          raidz2 sdc ... \
          raidz3 sde ... \
          spare  sdf ...

    Notice the cost of parity when using RAID-Z. See here and here.

    Refer to zpoolconcepts and zpool-create man pages for details.

  18. Set partition size:

    Set ESP size:


    Set boot pool size. To avoid running out of space while using boot environments, the minimum is 4GB. Adjust the size if you intend to use multiple kernel/distros:


    Set swap size. It’s recommended to setup a swap partition. If you intend to use hibernation, the minimum should be no less than RAM size. Skip if swap is not needed:


    Root pool size, use all remaining disk space if not set: