IBM Storwize V5010 Manual page 464

Cold demote
Coldest extent moves to a lower tier.
Expanded or cold demote
Demote appropriate sequential workload to the lowest tier to better use nearline
bandwidth.
Swap
This operation exchanges a cold extent in a higher tier with a hot extent in a lower tier or
vice versa.
Note: Extent migrations occur only between adjacent tiers within the same pool.
Figure 9-3 shows the Easy Tier extent migration.
Figure 9-3 Easy Tier actions
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Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1