IBM V7000 Introduction And Implementation Manual page 288

2. Select the primary pool by clicking it and the view changes to the second pool
(Figure 6-16).
Figure 6-16 Thin Mirror - select the secondary pool
3. Select the pool for the secondary copy and enter a name and a size for the new volume
(Figure 6-17).
Figure 6-17 Thin Mirror - Enter volume name and size
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide