Dell PowerFlex Rack with PowerFlex 3.x Administration Guide

Determining and switching the PowerFlex metadata manager

Manually fail over the PowerFlex metadata manager (MDM) before rebooting it.

1. Optional: If your system was not deployed using the PowerFlex plug-in, in the PowerFlex CLI type the following for each MDM:

   esxcli system module parameters list -m scini | grep IoctlMdmIPStr

2. Log in to the primary or secondaryMDM using PowerFlex GUI management software.
3. Click MDM > MDM to determine which storage VM (SVM) is the primaryMDM.
   
4. Access the primaryMDM:
   1. In a hyperconverged deployment, use SSH to connect to the SVM that is acting as primaryMDM.
      
   2. In a two-layer deployment, connect to the storage-only node that is acting as primaryMDM using SSH.
5. From the PowerFlex CLI, type scli --login --username admin --password MDM_password to connect to the source node.
6. Type scli --query_cluster to re-verify the primaryMDM.
7. Type scli --switch_mdm_ownership to switch the primaryMDM to the secondaryMDM.
8. Type scli --query_cluster to re-verify the primaryMDM.
9. Connect to the new SVM that is acting as primaryMDM using SSH.
10. Type scli --query_all_sds and verify that all servers are connected.
11. Type scli --query_all_sdc and verify that all servers are connected.