Dell PowerStore Importing External Storage to PowerStore Guide

Manage non-disruptive import sessions

1. Under Migration, select Import External Storage.
   The Import External Storage page appears and lists information about the existing remote systems.
2. Select Block Imports.
   The Import External Storage page changes and lists information about the existing block import sessions.
3. Perform one of the following import actions:
   NOTE:The import actions that can be performed on an import session depend on the current state of the import session.

   Action	Description
   Cancel	Select an import session and under Import Actions, click Cancel. You can cancel an import session that is in one of the following states: Queued Scheduled For volume, Copy In Progress, or, for consistency group, In Progress Paused Ready For Cutover For consistency group, Import Cutover Incomplete For consistency group, Cancel Failed For consistency group, Failed The cancel operation sets the state of the import session to CANCELLED and disables access to the destination volume. It also deletes the destination volume or volume group that is associated with the import session. NOTE:When all the volumes in a volume group are canceled successfully, the state of the import session is set to CANCELLED. However, if one or more of the member volumes are in a state other than CANCELLED, the status of the volume group is set to Cancel Failed. This action occurs because the status of the volume group depends on the final status of the member volumes. Repeat the cancel operation again until it succeeds and the status for the volume group becomes CANCELLED. NOTE:Import sessions are not deleted. If you want to delete the import session, use the delete operation that is available only through the REST API. NOTE:A Force Stop option is provided in the confirmation dialog box for Cancel if either a source system or a host is down. Selecting this option terminates the import session without rolling back access to the volumes on the source system. Manual intervention may be required on the source system or host, or both. NOTE:After an import session is successfully cancelled, wait five minutes before retrying to import the same volume or consistency group. If you try the import again immediately after the successful cancel operation, the import may fail.
   Cutover	NOTE:Before performing the cutover, ensure that you can access your data as expected. You cannot revert after this step. Select an import session and under Import Actions, click Cutover to commit an import session. You can cut over an import session that is in the Ready For Cutover state. After cutover, the source volume or source consistency group is no longer accessible to the associated hosts and the PowerStore cluster. NOTE:When all the volumes in a consistency group are cut over successfully, the state of the import session is set to Import Complete. However, if one or more of the member volumes are in a state other than Import Complete, the status of the consistency group is set to Cutover Failed. This action occurs because the status of the consistency group depends on the final status of the member volumes. Remove all the failed volumes from the consistency group and try the import again. NOTE:After one set of imports is completed, run the next set of imports after a delay of 10 minutes. This delay allows enough time for the system to cleanup any connections to the source system.
   Pause	Select an import session and under Import Actions, click Pause. Use Pause to pause an import session that is in the Copy In Progress state. NOTE:The Pause import action on a CG only pauses the member volumes that are in the Copy In Progress state. The CG remains in the In Progress state. Other member volumes that are in other states, such as Queued or In Progress, are not paused and may proceed to the Ready For Cutover state. The other member volumes can be paused when they reach the Copy In Progress state by using the Pause import action again on the CG. If any of the member volumes are in the Paused state but the overall status of the CG is In Progress, both the Pause and Resume import action options are available for the CG.
   Resume	Select an import session and under Import Actions, click Resume. Use Resume to start an import session that is in the Paused state.
   Cleanup	Select an import session and under Import Actions, click Cleanup. Use Cleanup to cleanup an import session that is in the Cleanup Required state.

   NOTE:If import of a source volume is in progress and a disaster occurs making the source system unusable or unreachable, you may need to contact your service provider to recover the source system involved in the import.

   NOTE: During an import session with a Dell PS Series source system that has not shared volumes, those volumes are changed to shared volumes as part of the import processing. If that import session is canceled or fails, the Access Control List of the Group Manager shows that the Multiple access field remains as shared. Since the job has failed or has been canceled, it is assumed that the import on the same volume will be retried. The Multiple access field setting is not automatically reverted to not shared.