The Dell PowerStore platform utilizes the Dynamic Resiliency Engine (DRE) to manage data protection and drive failures. When a failed drive is physically replaced, the PowerStore system automatically detects the new, healthy drive. It then initiates a rebalance process without any manual intervention. This process copies the data, which was previously rebuilt into distributed spare space, back onto the new drive. This automated workflow is designed to simplify administration, minimize the risk of human error, and ensure the system returns to a fully protected state as quickly as possible.

B. Manual start from CLI: The rebuild/rebalance process is automated by the system's software (DRE). Manual CLI commands are not required for this standard maintenance operation.

C. By rebooting the appliance: Rebooting an appliance is a highly disruptive action and is not part of the standard procedure for a drive replacement in a high-availability storage system like PowerStore.

D. By enabling multipathing software: Multipathing software operates at the host connectivity layer to manage I/O paths. It is not involved in the internal data management or drive rebuild processes of the storage array.

1. Dell Technologies White Paper: Dell PowerStore: Dynamic Resiliency Engine (DRE)

Page 8

Section "Drive Failure and Rebuild": "When a drive fails

PowerStore automatically uses the spare space within the appliance to rebuild the data from the failed drive... When the failed drive is replaced

the system automatically copies the data that was rebuilt into the spare space back to the new drive. This process is called a rebalance."

2. Dell PowerStore Manager Administration Guide

Section "Monitor hardware health": The guide details monitoring the status of components. After a replacement

the administrator's task is to verify that the system automatically recognizes the new component and that its status returns to 'Healthy'

confirming the automated nature of the recovery process. The procedure does not mention any manual rebuild commands.

3. Dell PowerStore: Introduction to the Platform White Paper

Page 18

Section "Dynamic Resiliency Engine": "DRE automatically manages space and performs background operations to maintain the system. When a drive fails

the system uses the spare space to rebuild the data. When the failed drive is replaced

the system automatically rebalances the data back to the new drive."