Dell PowerStore 1200T EMC PowerStore Protecting Your Data - Page 28

Setting metro role The system from which the metro volume is configured is automatically set as preferred upon metro volume configuration. The preferred system keeps host and production access and an active association with a protection policy when the metro volume is fractured or paused. When the metro volume state is Operating Normally (Active-Active), you can change the metro volume role from preferred to non-preferred or non-preferred to preferred using the following options: ● Modify Preferred Role - Use this option to change the current role of a selected metro volume. This option can be used from both the preferred or non-preferred system. NOTE: This option is in the metro volume details window. ● Set Local Role to Preferred - Use this option to set the role of multiple selected non-preferred metro volumes to preferred. This option should be used before shutting down the preferred system for planned maintenance. Setting the non-preferred metro volumes to preferred allows the metro volume to continue host and production access during the shutdown. Pause a metro volume About this task Temporarily pausing a metro volume is required in the following scenarios: ● When there are required configuration changes that cannot be performed when the volume is operating normally, such as changing the volume properties. ● When the preferred or non-preferred systems require maintenance, such as replacement of faulty hardware components or changes in network infrastructure. ● When there is a failure on the preferred system that requires promoting the non-preferred system to enable controlled recovery. Pause can be initiated from either the preferred or non-preferred system. When a metro volume is paused, the synchronization between the systems is temporarily stopped. Production access and protection policies remain active on the preferred system. When a metro volume is fractured, and there is no connection between the local and remote system, pause is implemented only on the local system (where it was implemented): ● When pause is initiated from the preferred system ○ Host and production access remains enabled on a paused, preferred metro volume. ○ Host and production access remains unchanged on the non-preferred metro volume. ● When pause is initiated from the non-preferred system: ○ Host and production access remains disabled, unless the metro volume has been promoted. ○ Since there is not network connectivity, the pause does not modify the preferred metro volume state. ● When connectivity is resolved, pause should be initiated from the remote system as well. Steps 1. Select Protection > Metro. 2. Select the check box of the metro volume to pause and click Pause. The Pause Metro Volume slide-out panel is displayed. 3. click Pause to confirm. Resume a metro volume About this task Resume can be initiated either from the preferred or from the non-preferred system. When you resume a preferred, paused metro volume, the preferred system starts synchronizing data and snapshots with the non-preferred system. After synchronization is complete, the Metro volume status returns to an active/active state. When you resume a promoted, (previously non-preferred), paused metro volume, the non-preferred system starts synchronizing with the preferred system (Reprotecting state) to return to active-active state. 28 Metro Protection