I have installed Armbian 21.02 Ubuntu 20.04 Focal with Linux kernel 5.10.16 and OpenZFS 2.0.1-1 on my Helios64. Created a three-disk encrypted RAIDZ pool with the following command:
sudo zpool create -f -o ashift=12 -O compression=lz4 -O atime=off -O acltype=posixacl -O xattr=sa -O encryption=aes-256-gcm -O keylocation=prompt -O keyformat=passphrase tank raidz1 /dev/disk/by-id/foobar1 /dev/disk/by-id/foobar2 /dev/disk/by-id/foobar3
Then I did a single sequential read benchmark with fio on /tank:
cd /tank
sudo fio --name=single-sequential-read --ioengine=posixaio