A first content portion of a first disk partition is mirrored to a second content portion of a second disk partition. A first one of the first content portion and the second content portion that is modified contemporaneously with access by one or more client applications to one or more subportions of a second one of the first content portion and the second content portion.

 
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< Data element including metadata that includes data management information for managing the data element

< Storage controller redundancy using bi-directional reflective memory channel

> Accounting for update notifications in synchronizing data that may be represented by different data structures

> Method and apparatus for managing memory blocks in a logical partitioned data processing system
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