IBM V7000 Introduction And Implementation Manual page 374

Internal drives have their tier assigned automatically by IBM Flex System V7000 Storage
Node. MDisks on external storage systems are assigned the
This setting can be changed manually by the user. To assign a specific tier to an MDisk, click
Pools  MDisks by Pool and click Select Tier from the Actions drop-down menu
(Figure 8-51).
Figure 8-51 Select Tier for an MDisk
For demonstration purposes, we assign the tier Solid-State Drive to mdisk7 (Figure 8-52).
This MDisk is a LUN made of Fibre Channel hard disk drives in an external storage system.
The tier that was assigned by default is Hard Disk Drive.
Figure 8-52 Assign a tier to an MDisk
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
generic HDD tier
by default.