apt install -t buster-backports zfs-dkms zfsutils-linux
  modprobe zfs

  for a in c d; do wipefs /dev/sd${a}1 -a ; done
  zpool create tank mirror /dev/sdc1 /dev/sdd1
  zfs create -o mountpoint=/data tank/data
  zfs set sharenfs="rw=172.22.0.0/16,root_squash,ro=*.ihep.su" tank/data
  zfs set xattr=sa tank/data
  zfs set acltype=posixacl tank/data
  zfs set atime=off tank/data
  zfs set relatime=off tank/data
  
  zfs share tank/data
  exportfs -v
  
  zfs set compression=lz4 tank/data
  
  zpool set autoexpand=on tank

solution

options zfs zfs_autoimport_disable=0

zpool iostat -lv
zpool iostat -vq 1