diff --git a/lib/db/install.php b/lib/db/install.php
index 0379785..96553e5 100644
--- a/lib/db/install.php
+++ b/lib/db/install.php
@@ -27,7 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 function xmldb_main_install() {
-    global $CFG, $DB, $SITE;
+    global $CFG, $DB, $SITE, $OUTPUT;
 
     /// make sure system context exists
     $syscontext = get_system_context(false);
@@ -173,7 +173,12 @@ function xmldb_main_install() {
     $admin->timemodified = time();
     $admin->lastip       = CLI_SCRIPT ? '0.0.0.0' : getremoteaddr(); // installation hijacking prevention
     $admin->id = $DB->insert_record('user', $admin);
-    if ($admin->id != 2) {
+    if ($admin->id == 2) {
+        //expected result on standard acid compliant systems
+    } else if ($admin->id == 3) {
+        // this might be the even-odd mysql cluster, warn admins that it is not supported at all
+        echo $OUTPUT->notification('Non-continuous id numbering detected - database engine is not supported.', 'notifyproblem');
+    } else {
         throw new moodle_exception('generalexceptionmessage', 'error', '', 'Unexpected new admin user id!');
     }
     /// Store list of admins