Preparation

Disable Secure Boot. ZFS modules can not be loaded if Secure Boot is enabled.
Download latest Arch Linux live image and boot from it.
Connect to the Internet.
Set root password or /root/.ssh/authorized_keys.
Start SSH server:
```
systemctl restart sshd
```
Connect from another computer:
```
ssh root@192.168.1.19
```
Use bash shell. Other shells are not tested:
```
bash
```
Target disk

List available disks with:
```
find /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:
```
DISK='/dev/disk/by-id/disk1'
```
Set partition size:

Set swap size, set to 1 if you don’t want swap to take up too much space:
```
INST_PARTSIZE_SWAP=4
```
Root pool size, use all remaining disk space if not set:
```
INST_PARTSIZE_RPOOL=
```

Add ZFS repo:

curl -L https://archzfs.com/archzfs.gpg |  pacman-key -a -
pacman-key --lsign-key $(curl -L https://git.io/JsfVS)
curl -L https://raw.githubusercontent.com/openzfs/openzfs-docs/master/docs/Getting%20Started/Arch%20Linux/archzfs-repo/mirrorlist-archzfs > /etc/pacman.d/mirrorlist-archzfs

tee -a /etc/pacman.conf <<- 'EOF'

#[archzfs-testing]
#Include = /etc/pacman.d/mirrorlist-archzfs

[archzfs]
Include = /etc/pacman.d/mirrorlist-archzfs
EOF

Check kernel version:
```
uname -r
#5.18.7-arch1-1
```
Find a ZFS package compatible with the kernel:

Search kernel version string (e.g. 5.18.7) in both pages:
- https://archzfs.com/archive_archzfs/
- https://archzfs.com/archzfs/x86_64/
Such as:
```
curl -L https://archzfs.com/archive_archzfs/ \
| grep zfs-linux-[0-9] \
| grep -v src.tar \
| grep "5.18.7"
# ...<a href="zfs-linux-2.1.5_5.18.7.arch1.1-1-x86_64.pkg.tar.zst">...
```
Result: https/…/archive_archzfs/zfs-linux-2.1.5_5.18.7.arch1.1-1-x86_64.pkg.tar.zst
Find compatible zfs-utils package:

Search ZFS version string (e.g. 2.1.5) in both pages above:
```
curl -L https://archzfs.com/archzfs/x86_64/ \
| grep zfs-utils-2.1.5 \
| grep -v src.tar
# ...<a href="zfs-utils-2.1.5-1-x86_64.pkg.tar.zst">...
```
Result: https/…/archzfs/x86_64/zfs-utils-2.1.5-2-x86_64.pkg.tar.zst

Download both then install:

pacman -U link-to-zfs.zst link-to-utils.zst

Load kernel modules:
```
modprobe zfs
```