Chapter 6. Storage pools 235
To change the external MDisk storage tier, use chmdisk. Example 6-26 shows setting the new 
tier to the mdisk2. No feedback is returned.
Example 6-26   Changing tier setting with CLI 
IBM_Storwize:ITSOV7K:superuser>chmdisk -tier tier1_flash mdisk2
IBM_Storwize:ITSOV7K:superuser>
Modify encryption
Select Modify Encryption to modify the encryption setting for the MDisk. This option is 
available only when encryption is enabled. 
If the external MDisk is already encrypted by the external storage system, change the 
encryption state of the MDisk to Externally encrypted. This setting stops the system from 
encrypting the MDisk again if the MDisk is part of an encrypted storage pool.
For information about encryption, encrypted storage pools, and self-encrypting MDisks, see 
Chapter 12, “Encryption” on page 603.
To perform this task with CLI, use chmdisk. See Example 6-27.
Example 6-27   Using chmdisk to modify encryption
IBM_Storwize:ITSOV7K:superuser>chmdisk -encrypt yes mdisk5
IBM_Storwize:ITSOV7K:superuser>
Import
This action is available only for unmanaged MDisks. Importing an unmanaged MDisk allows 
the user to preserve the data on the MDisk. You can migrate the data to a new volume or keep 
the data on the external system. 
MDisks are imported for storage migration. IBM Storwize V7000 provides a migration wizard 
to help with this process. It is discussed in Chapter 9, “Storage migration” on page 385.
Select Import to choose one of the following migration methods:
/SM590000Import to temporary pool as image-mode volume does not migrate data from the 
source MDisk. It creates an image-mode volume that has a direct block-for-block 
translation of the MDisk. The existing data is preserved on the external storage system, 
but it is also accessible from the Storwize V7000 system.
In this method, the image-mode volume is created in a temporary migration pool and is 
presented through the Storwize V7000. Choose the extent size of the temporary pool and 
click Import, as shown in Figure 6-57 on page 236.
Note: The wizard is the preferred method to migrate data from legacy storage to the 
Storwize V7000. When an MDisk presents as imported, the data on the original LU is not 
modified. The system acts as a pass-through, and the extents of the imported MDisk do 
not contribute to storage pools.