Konrad Raynes Davda & Victor LLP
Tertiary storage unit management in bidirectional data copying
In one embodiment of the present description, mirroring is provided for a pair of storage units in bidirectional synchronous mirror relationships, and a tertiary storage unit. The mirroring includes multi-target mirroring to write updates written to the first storage unit to both the second storage unit and to a third storage unit. Similarly, for updates written to the second storage unit, multi-target mirroring is employed to write those to both the first storage unit and to the third storage unit. Other aspects are described.
INTERNATIONAL BUSINESS MACHINES CORPORATION
G G G G G G
G06F G06F G06F G06F G06F G06F
inventional additional inventional inventional inventional inventional
Theresa M. Theodore T. Nicolas M. Gregory E. Carol S. Warren K.
Brown Harris, Jr. Clayton McBride Mellgren Stanley