When Yes is selected, the data remaining in cache is not guaranteed.Deleting external volume mapping
You can delete the mapping for an external volume. The data in the external volume is not deleted.
Prerequisites
The external volume or volumes to be deleted must first be disconnected, which results in all data in cache memory being written to the external volume.
However, you can delete a volume without disconnecting, meaning that data in cache is not destaged to the external volume.
You cannot delete a mapping while the external volume is used in the following:
TrueCopy, Universal Replicator, ShadowImage, or Thin Image
A reserved volume for ShadowImage or Volume Migration.
A pool-VOL
For command devices, stop the application using the external volume as a command device.
You must have Storage Administrator (Provisioning) role to perform this task.
Procedure
Open the External Storage window.
In the Hitachi Command Suite:
On the Resources tab, click Storage Systems, and then expand All Storage Systems.
Expand the target storage systems, right-click External Storage, and then select System GUI.
In Device Manager - Storage Navigator:
Click Storage Systems, and then expand the Storage Systems tree.
Click External Storage.
On the External Storage Systems tab, click the link for an external system
On the External Path Groups tab, click the link for a path group.
On the Mapped Volumes tab, select the external volume.
Click More Actions and select Delete External Volumes.
In the Delete External Volumes window, verify the external volumes you want to delete.
For Have you already disconnected external volume of above table?, click one of the following:
Yes if you have already disconnected the volumes.
No if you have not disconnected the volumes.
If you clicked No in the previous field, in the Do you want to execute Delete External Volumes operation without writing the cache data to the volumes?, click one of the following:
Yes to delete the external volumes without writing the data in cache memory into the volumes.
When Yes is selected, the data remaining in cache is not guaranteed.
Cancel to disconnect the volume or volumes and then perform the delete operation again.
You cannot continue the operation if No is selected.
Click Finish.
In the Confirm window, check settings and accept the task name shown or enter a new one. When satisfied click Apply.
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