Hi Stefan,  When installing the MDM, you need to use the precursors as follows:  MDM_ROLE_IS_MANAGER=1 dpkg -i MDM_ROLE_IS_MANAGER=0 dpkg -i   When set as 1, it will be an MDM. When set as 0, it will be a tie breaker.  The quickest way to fix is to go edit the /opt/emc/scaleio/mdm/cfg/conf.txt. You should have a line in the file that looks like this currently:  actor_role_is_manager=0  Edit the line and make the 0 into a 1, save the file, and then stop and restart the mdm process: /opt/emc/scaleio/mdm/bin/delete_service.sh /opt/emc/scaleio/mdm/bin/create_service.sh  Then you can add this node in as an MDM instead of a tie breaker.   Good luck!
Hello,  litte mistake, after uninstall mdm from cluster, i need to readd the mdm to cluster.  I wanted to upgrade from ubuntu 14.04 to 16.04, but then I fixed the scaleio in the trialversion is not yet available.  What have i do:  - uninstalled emc software from node 1 - switched to one node cluster  root[NAME]:~# scli --query_cluster Cluster:     Mode: 1_node, State: Normal, Active: 1/1, Replicas: 1/1 Master MDM:     Name: Manager2, ID: 0x210c0653683e7121         IPs: 192.168.12.11, Management IPs: 192.168.12.11, Port: 9011         Version: 2.0.7120  - installed mdm MDM_IP=192.168.12.10,192.168.12.15 dpkg -i EMC-ScaleIO-mdm-2.0-7120.0.Ubuntu.14.04.x86_64.deb  root[NAME]:~# scli --add_standby_mdm --new_mdm_ip 192.168.12.10 --mdm_role manager --new_mdm_management_ip 192.168.12.10 --approve_certificate --force_clean You are about to clear previous configuration on this MDM. Press 'y' and then Enter to confirm.y  Error: MDM failed command.  Status: MDM role is not a Slave but a Tie-Breaker   He says the mdm is a tie-breaker. Here I know no further, Tie-Breaker was in the cluster the 192.168.12.13.  I will reconnect the mdm to 3 node cluster.   King regards Stefan
MDM to cluster, MDM role is not a Slave but a Tie-Breaker,