An engineer must permanently remove a node from a 10-node PowerFlex system The node is the primary MDM. What must they do before they remove the node…

Before a node hosting the primary Meta Data Manager (MDM) can be removed, the primary role must be transferred to a standby MDM to ensure the cluster remains manageable and available. This process is called an MDM ownership switchover. PowerFlex Manager provides a guided, high-level workflow to "reconfigure MDM roles," which safely orchestrates this switchover. This action demotes the current primary to a standby, promotes another node to primary, and then allows for the safe removal of the original node without causing cluster errors or downtime.

1. Dell PowerFlex Administration Guide (Version 4.0): In the section "MDM cluster management

" the procedure for removing an MDM explicitly states

"Before you remove the primary MDM from the cluster

you must switch MDM ownership to one of the standby MDMs." This confirms that reassigning the primary role is a mandatory prerequisite. (Reference: Chapter 4: "System Maintenance

" Section: "MDM cluster management").

2. Dell PowerFlex Command Line Interface (CLI) Reference Guide (Version 4.0): The documentation for the scli --switchmdmownership command describes its function as "Switches MDM cluster ownership from the master MDM to a specified slave MDM." This is the underlying command that a tool like PowerFlex Manager would use to reconfigure the roles before removal. (Reference: Chapter 2: "SCLI Commands

" Section: "MDM Cluster Commands").

3. Dell PowerFlex Manager Administration Guide (Version 4.0): The guide details service and node removal procedures. The workflows within PowerFlex Manager for removing a node with an MDM service automatically handle the necessary prerequisites

including performing an MDM switchover if the node is the primary. This automated role change is encompassed by the action "reconfigure MDM roles." (Reference: Chapter 6: "Maintaining Resources

" Section: "Removing a node from a PowerFlex system").