Konrad Raynes Davda & Victor LLP
Bitmap selection for remote copying of updates
In one embodiment of the present description, a copy relationship is established between a storage location at a first site and a storage location at a second site in a data storage system, wherein a dynamically assignable bitmap preset to one of a plurality of different predetermined bit patterns is selected as a function of both the availability of the selected bitmap and the type of predetermined bit pattern identified for the selected bitmap. The selected bitmap may be assigned as an out-of-sync bitmap wherein updates to the storage location at one site, which are to be copied to the storage location at the other site, are indicated in the selected bitmap, and data writes being written to the storage location at the one site, are copied to the storage location at the other site, using the selected bitmap as an out-of-sync bitmap. Other aspects are described.
INTERNATIONAL BUSINESS MACHINES CORPORATION
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Alfred E. Theresa M. Nedlaya Y. Theodore T. Raul E. Carol S. Suguang Warren K. Mark L.
Sanchez Brown Francisco Harris, Jr. Saba Mellgren Li Stanley Lipets