diff --git a/manifests/db/online_data_migrations.pp b/manifests/db/online_data_migrations.pp
index cab14b37..7b6542ad 100644
--- a/manifests/db/online_data_migrations.pp
+++ b/manifests/db/online_data_migrations.pp
@@ -8,15 +8,22 @@
 #   to the ironic-dbsync command.
 #   Defaults to undef
 #
+# [*migration_params*]
+#   (optional) String of extra command line parameters to pass to migrations.
+#   Unlike extra_params, these apply to migrations themselves, not to the
+#   ironic-dbsync command.
+#   Defaults to undef
+#
 class ironic::db::online_data_migrations(
-  $extra_params = undef,
+  $extra_params     = undef,
+  $migration_params = undef,
 ) {
 
   include ::ironic::deps
   include ::ironic::params
 
   exec { 'ironic-db-online-data-migrations':
-    command     => "${::ironic::params::dbsync_command} ${extra_params} online_data_migrations",
+    command     => "${::ironic::params::dbsync_command} ${extra_params} online_data_migrations ${migration_params}",
     path        => '/usr/bin',
     user        => 'ironic',
     refreshonly => true,
diff --git a/releasenotes/notes/migration-params-f9ec055f4ab5e98d.yaml b/releasenotes/notes/migration-params-f9ec055f4ab5e98d.yaml
new file mode 100644
index 00000000..8af24f61
--- /dev/null
+++ b/releasenotes/notes/migration-params-f9ec055f4ab5e98d.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    Add new parameter ``ironic::db::online_data_migrations::migration_params``
+    to allow passing arguments to migration themselves (``extra_params`` passes
+    arguments to the ``ironic-dbsync`` command itself and cannot be used to
+    tune migrations).
diff --git a/spec/classes/ironic_db_online_data_migrations_spec.rb b/spec/classes/ironic_db_online_data_migrations_spec.rb
index f01b7a06..8f8591f4 100644
--- a/spec/classes/ironic_db_online_data_migrations_spec.rb
+++ b/spec/classes/ironic_db_online_data_migrations_spec.rb
@@ -6,7 +6,7 @@ describe 'ironic::db::online_data_migrations' do
 
     it 'runs ironic-db-sync' do
       is_expected.to contain_exec('ironic-db-online-data-migrations').with(
-        :command     => 'ironic-dbsync --config-file /etc/ironic/ironic.conf  online_data_migrations',
+        :command     => 'ironic-dbsync --config-file /etc/ironic/ironic.conf  online_data_migrations ',
         :path        => '/usr/bin',
         :user        => 'ironic',
         :refreshonly => 'true',
@@ -24,13 +24,14 @@ describe 'ironic::db::online_data_migrations' do
     describe "overriding extra_params" do
       let :params do
         {
-          :extra_params => '--config-file /etc/ironic/ironic_01.conf',
+          :extra_params     => '--config-file /etc/ironic/ironic_01.conf',
+          :migration_params => '--max-count 100',
         }
       end
 
       it {
         is_expected.to contain_exec('ironic-db-online-data-migrations').with(
-          :command     => 'ironic-dbsync --config-file /etc/ironic/ironic.conf --config-file /etc/ironic/ironic_01.conf online_data_migrations',
+          :command     => 'ironic-dbsync --config-file /etc/ironic/ironic.conf --config-file /etc/ironic/ironic_01.conf online_data_migrations --max-count 100',
           :path        => '/usr/bin',
           :user        => 'ironic',
           :refreshonly => 'true',