refer to page 236 of the 1.32 User Guide - Changing an MDM server or changing an MDM IP address. To move an MDM between servers, perform the following: 1. Prepare the new MDM node with the necessary IP addresses. 2. Query the MDM cluster by typing the following command: scli –-query_cluster --mdm_ip Ensure that the Primary MDM is not running on the server that is about to be replaced. If it is, first use the switch_mdm_ownership command. 3. Install the MDM on a new server. Ensure that the server is connected to the network that is used by ScaleIO components. 4. Switch the cluster to single mode by typing the following command: scli --switch_to_single_mode 5. Remove the secondary MDM node by typing the following command: scli --remove_secondary 6. Add the new MDM node by typing the following command: scli --add_secondary_mdm --secondary_mdm_ip [--secondary_mdm_port ] Example scli --add_secondary_mdm --mdm_ip 9.4.4.111 --secondary_mdm_ip 9.4.4.112 Example output Successfully added a Secondary MDM. Object ID 2eab49560bb0b8b4 7. Switch to cluster mode by typing the following command: scli --switch_to_cluster_mode 8. Query the MDM cluster to see that its state is back to normal by typing the following command: scli –-query_cluster   When changing an MDM IP, you must update the SDC as well.   But if you have carried out teh steps as per tomer_engineering_qa pointed out you then  need to :  The long painful recovery will be to: 1. Deploy a new SVM (from the SIO templates) with the exact same IPs + default GW + subnet mask 2. Manually install the MDM + SDS on that SVM 3. Connect  the the P.MDM and via CLI run several commands....
Hi all  I attempted to remove node which include SDS and second MDM in GUI operation. The node has successfully removed and I try add SDS into my cluster, I find out I can't choose node that has removed one,  and I manually remove SVM vm in vSphere, unfortunately the second MDM had removed too.  Is there any command to rebuild second MDM in SDS VM ?  Thanks.
Rebuild second MDM component