One method of updating a change track map involves resetting a mirror recovery map for a data volume. Just before the mirror recovery map is reset, a change track map for the data volume can be updated, using the mirror recovery map. The mirror recovery map can be reset by a data element of a data processing system, while the change track map can be updated by a control element of the data processing system.

 
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> Method, system, and apparatus for a plurality of slave devices determining whether to adjust their power state based on broadcasted power state data

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