diff --git a/sysadmin/grid5000/cassandra/ansible/zfs.yml b/sysadmin/grid5000/cassandra/ansible/zfs.yml
index fe73581..6525078 100644
--- a/sysadmin/grid5000/cassandra/ansible/zfs.yml
+++ b/sysadmin/grid5000/cassandra/ansible/zfs.yml
@@ -1,77 +1,77 @@
 ---
 - name: Install contrib and non-free repositories
   apt_repository:
     repo: deb http://deb.debian.org/debian/ buster-backports main contrib non-free
     filename: backports.sources
 - name: Install contrib
   apt_repository:
     repo: deb http://deb.debian.org/debian/ buster contrib non-free
     filename: buster-contrib.sources
 
 - name: Install zfs packages
   apt:
     update_cache: true # force an apt update before
     name:
     - linux-image-amd64
     - linux-headers-amd64
     - libnvpair1linux
     - libuutil1linux
     - libzfs2linux
     - libzpool2linux
     - zfs-dkms
     - zfs-zed
     - zfsutils-linux
   ignore_errors: True
 
 - name: Ensure zfs initialized
   shell: /usr/sbin/modprobe zfs
 
 - name: Finalize zfs packages installation
   apt:
     update_cache: true # force an apt update before
     name:
     - linux-image-amd64
     - linux-headers-amd64
     - libnvpair1linux
     - libuutil1linux
     - libzfs2linux
     - libzpool2linux
     - zfs-dkms
     - zfs-zed
     - zfsutils-linux
 
 - name: Install zfs packages after modprobe
   apt:
     update_cache: true # force an apt update before
     name:
     - zfsutils-linux
     - zfs-zed
 
 - name: Remove possible old lvm volumes
   shell: vgscan | awk '{print $4}'| grep -v -e volume -e swh-debian | xargs -r -n1 vgremove -y
 
 - name: test if zfs pools are configured
   command: zfs list -o name
   register: pool_list
 
 - name: zfs pool import
   shell: "zpool import {{ item.key }}"
-  loop:  "{{ lookup('dict', zfs_pools) }}"
+  loop:  "{{ lookup('dict', zfs_pools, wantlist=True) }}"
   when: item.key not in pool_list.stdout_lines
   ignore_errors: True
 
 - name: test if zfs pools are configured
   command: zfs list -o name
   register: pool_list
 
 - name: create zfs pools
   shell: "zpool create -f {{ item.key }} {{ item.value.disks | join(' ') }}"
   loop:  "{{ lookup('dict', zfs_pools, wantlist=True) }}"
   when: item.key not in pool_list.stdout_lines
 
 - name: call dataset creation
   include: _zfs_create_dataset.yml obj={{ outside_item }}
   loop: "{{ lookup('dict', zfs_pools, wantlist=True) }}"
   loop_control:
     loop_var: outside_item
   when: outside_item.key not in pool_list.stdout_lines