diff --git a/operation-tools/restart_cluster.yml b/operation-tools/restart_cluster.yml
index ffa0be5..6dd2361 100644
--- a/operation-tools/restart_cluster.yml
+++ b/operation-tools/restart_cluster.yml
@@ -51,7 +51,7 @@
 - name: start dispatcher nodes
   hosts: databuffer_cluster
   become: true
-  serial: 1
+  # serial: 1
   tasks:
     - name: start daq-dispatcher-node
       systemd:
@@ -70,7 +70,7 @@
 - name: start query nodes
   hosts: databuffer_cluster
   become: true
-  serial: 1
+  # serial: 1
   tasks:
     - name: start daq-query-node
       systemd: