The correct procedure for powering down a single PowerStore node for planned service is to use PowerStore Manager to place the node into Service Mode. This is a critical step in a high-availability cluster. Placing the node in Service Mode initiates a graceful shutdown process, which includes migrating all active storage resources (LUNs, vVols, file systems) to the peer node. This ensures that I/O operations continue without interruption and prevents any data loss or corruption. The entire operation is managed through the PowerStore Manager software interface to ensure system stability and data integrity.

A. Disconnect PSU immediately

This action causes an ungraceceful shutdown, which can lead to data corruption and is not the standard procedure for planned maintenance.

D. Remove NVMe drives before shutdown

NVMe drives should only be removed after the node has been safely placed in service mode and powered down, not as a preliminary step.

1. Dell PowerStore Manager Administrator Guide for PowerStoreOS 3.6

Page 189

Chapter 10: "Service the system"

Section: "Put a hardware component into service mode".

The document states

"Before you perform any service actions on a hardware component

you must place the component into service mode. Placing a component into service mode ensures that the system is in a safe state before the component is removed or serviced... For a node

placing it in service mode ensures that all storage resources gracefully fail over to the peer node before the node is powered off." This supports both using PowerStore Manager (B) and putting the node in service mode (C).

2. Dell PowerStore T models Hardware Information Guide for PowerStoreOS 3.6

Page 101

Chapter 5: "Servicing your system"

Section: "Replace a node".

Step 1 of the node replacement procedure explicitly instructs the user: "In PowerStore Manager

place the node that you want to replace in service mode." This confirms that the process is initiated via PowerStore Manager (B) and the specific action is to enter service mode (C).