diff -up install/install.php.orig install/install.php
--- install/install.php.orig	2012-01-24 12:22:16.000000000 +0100
+++ install/install.php	2012-02-26 10:04:57.482199413 +0100
@@ -351,6 +351,15 @@ function step4 ($host, $user, $password,
       $query = "UPDATE `glpi_users`
                 SET `language` = NULL";
       $DB->query($query) or die("4203 ".$LANG['update'][90].$DB->error());
+      
+      // RPM provides a good system cron
+      $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `name`!='watcher' AND (`allowmode` & 2)";
+      $DB->query($query)
+      or die("RPM update of glpi_crontasks. " . $LANG['update'][90] . $DB->error());
+
+      $query = "UPDATE `glpi_configs` SET `cron_limit` = '3'";
+      $DB->query($query)
+      or die("RPM update of glpi_configs. " . $LANG['update'][90] . $DB->error());
    }
 
 
diff -up install/update.php.orig install/update.php
--- install/update.php.orig	2012-02-09 21:19:30.000000000 +0100
+++ install/update.php	2012-02-26 10:07:24.899206029 +0100
@@ -770,6 +770,11 @@ 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)";
+   $DB->query($query)
+   or die("RPM update of glpi_crontasks. " . $LANG['update'][90] . $DB->error());
+
    DBmysql::optimize_tables($migration);
 
    return $ret;