410 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
To change the storage tier for an MDisk that is assigned, while in Pools → External Storage, 
right-click one or more selected MDisks and choose Modify Tier, as shown in Figure 10-5. 
Figure 10-5   Changing MDisk tier
To determine what tier is assigned to an MDisk, on Pools → External Storage, select 
Actions → Customize columns and select Tier. This includes the current tier setting into a 
list of MDisk parameters that are shown on the External Storage pane. You can also find this 
information in MDisk properties. To show this information, right-click MDisk, select 
Properties, and click View more details, as shown in Figure 10-6.
Figure 10-6   MDisk properties
To list MDisk parameters with the CLI, use the lsmdisk command. The current tier for each 
MDisk is shown. To change the external MDisk tier, use the chmdisk command with the -tier 
parameter, as shown in Example 10-1 on page 411.
Note: Assigning a tier that does not match to a physical back-end storage type to an 
external MDisk is not supported by IBM and can lead to unpredictable consequences.