diff -up install/install.php.orig install/install.php
--- install/install.php.orig	2013-09-29 17:04:16.326382959 +0200
+++ install/install.php	2013-09-29 17:08:07.616396210 +0200
@@ -350,6 +350,13 @@ function step4 ($databasename, $newdatab
       $query = "UPDATE `glpi_users`
                 SET `language` = NULL";
       $DB->queryOrDie($query, "4203");
+
+      // RPM provides a good system cron
+      $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `name`!='watcher' AND (`allowmode` & 2)";
+      $DB->queryOrDie($query, "4203");
+
+      $query = "UPDATE `glpi_configs` SET `cron_limit` = '3'";
+      $DB->queryOrDie($query, "4203");
    }
 
    $link = new mysqli($host, $user, $password);
diff -up install/update.php.orig install/update.php
--- install/update.php.orig	2013-09-12 21:17:15.000000000 +0200
+++ install/update.php	2013-09-29 17:07:53.124390070 +0200
@@ -776,6 +776,10 @@ function updateDbUpTo031() {
    $plugin = new Plugin();
    $plugin->unactivateAll();
 
+   // RPM provides a good system cron
+   $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `name`!='watcher' AND (`allowmode` & 2)";
+   $DB->queryOrDie($query);
+
    DBmysql::optimize_tables($migration);
 
    return $ret;