Limitations on mapping an external volume
After connecting a port to the external storage system, an external volume can be mapped as internal volume. Make sure to check the capacity requirements of the external volume you intend to map as an internal volume.
Following are the limitations on mapping an external volume:
You cannot access data in an external volume that exceeds the capacity of the internal volume to which it is mapped. For example, if you map 100GB of an external volume as 70GB of the internal volume, 30GB of external volume cannot be accessed from the local storage system side.
You cannot map an external volume as internal volume if the external volume capacity is less than the internal volume. For example, you cannot map 10GB of the external volume as an internal volume with a minimum capacity requirement of 30GB.