diff --git a/machines/storage01/prometheus.nix b/machines/storage01/prometheus.nix
index a58bd96..bcf5cfc 100644
--- a/machines/storage01/prometheus.nix
+++ b/machines/storage01/prometheus.nix
@@ -20,6 +20,14 @@ in
 
     webExternalUrl = "https://${host}";
 
+    retentionTime = "6m";
+
+    extraFlags = [ "--storage.tsdb.retention.size=20GB" ];
+
+    globalConfig = {
+      scrape_interval = "15s"; # if you change this settings, please do it in grafana also
+    };
+
     scrapeConfigs = [
       {
         job_name = "prometheus";