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Dell PowerStore Protecting Your Data

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Promote a metro resource

Prerequisites

  • You can promote individual metro volumes or metro volume groups. It is not possible to promote a metro volume that is a member of a volume group.
  • Promoting a metro resource is allowed in a Fractured or Paused state.

About this task

When the link between the two storage systems fails or when the nonpreferred system is down, the synchronization between the systems is stopped and the metro resource becomes fractured. The preferred system remains active and continues to service I/Os. If the user is on the preferred system, no action is required and the systems synchronize when the issue is resolved.

When a failure occurs on the preferred system, the synchronization between the systems is stopped and the metro resource becomes fractured. Both systems stop servicing I/Os. To be able to access the metro resource, the user must promote the metro resource on the nonpreferred system to enable host and production access to it until the preferred system recovers. If the user verifies that the preferred system is available, the metro resource on the nonpreferred system can be promoted with no implication. When the user is on the nonpreferred system, it is not possible to know the status of the preferred system (whether the system is down or the link between the system is down). In this case, promoting the metro volume on the nonpreferred system may result in a situation where both systems continue to service I/O but do not synchronize.

Steps

  1. Select Protection > Metro.
    The Metro page lists all the metro resources and enables you to evaluate all the impacted resources and prioritize promoting resources according to your considerations.
    NOTE:The metro status of the resource should be Fractured.
  2. Select the status of the metro resource to display the metro resource details page and then select Promote.
    The Promote Metro Volume/Volume Group slide-out panel is displayed.
    NOTE:Before the promotion takes place, a snapshot of the metro resource is taken.
  3. Verify that you understand the implication of promoting the metro resource in case the remote system is servicing I/Os and verify that the remote system is down if possible.
  4. Select the confirmation checkbox at the bottom of the Promote Metro Volume/Volume Group slide-out panel, and select Promote.
    The promoted state of the metro resource is indicated in the metro resource details page.

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