diff --git a/manifests/params.pp b/manifests/params.pp
index 6381c2f..70a2d11 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -13,6 +13,8 @@
 # @param [String] ps_main_port the firewall main port for prometheus
 # @param [String] ps_auth_user the username for authentication
 # @param [String] ps_auth_pass the password for authentication
+# @param [String] ps_retention_time tsdb retention time
+# @param [String] ps_retention_size tsdb retention size
 ##############################################################################
 class prometheus_cd::params (
 
@@ -35,6 +37,10 @@ class prometheus_cd::params (
   String $ps_auth_user          = 'changeme',
   String $ps_auth_pass          = 'changeme',
 
+  # storage
+  String $ps_retention_time     = '15d',
+  String $ps_retention_size     = '20GB',
+
 ) {
   # defaults
   $fqdn                   = $facts['networking']['fqdn']
diff --git a/templates/override.conf.erb b/templates/override.conf.erb
index 97e5da5..06fbf14 100644
--- a/templates/override.conf.erb
+++ b/templates/override.conf.erb
@@ -7,4 +7,7 @@ ExecStart=/usr/bin/prometheus \
   --config.file=/etc/prometheus/prometheus.yml \
   --storage.tsdb.path=/var/lib/prometheus \
   --web.enable-remote-write-receiver \
-  --web.enable-lifecycle
\ No newline at end of file
+  --web.enable-lifecycle
+  --storage.tsdb.wal-compression
+  --storage.tsdb.retention.time=<%= @ps_retention_time %>
+  --storage.tsdb.retention.size=<%= @ps_retention_size %>
\ No newline at end of file