diff --git a/ansible/roles/metacluster/tasks/cleanup.yml b/ansible/roles/metacluster/tasks/cleanup.yml
index 45e28d5..d236a53 100644
--- a/ansible/roles/metacluster/tasks/cleanup.yml
+++ b/ansible/roles/metacluster/tasks/cleanup.yml
@@ -1,4 +1,4 @@
 - name: Zero-out disk
   ansible.builtin.shell:
-    cmd: dd bs=1M count=$(df -m . | awk '/[0-9]%/{print $(NF-2)}') if=/dev/zero of=./zero; sync; sync; rm -f ./zero
+    cmd: nice -n 10 dd bs=1M count=$(df -m . | awk '/[0-9]%/{print $(NF-2)}') if=/dev/zero of=./zero; sync; sync; rm -f ./zero
     chdir: /opt/metacluster