Konrad Raynes Davda & Victor LLP
Merging an out of synchronization indicator and a change recording indicator in response to a failure in consistency group formation
A first data structure stores indications of storage locations that need to be copied for forming a consistency group. A second data structure stores indications of new host writes subsequent to starting a point in time copy operation to form the consistency group. Read access is secured to a metadata storage area and a determination is made as to whether the second data structure indicates that there are any new host writes. In response to determining that the second data structure indicates that there are new host writes, write access is secured to the metadata storage area, the first data structure is updated with contents of the second data structure to determine which additional storage locations need to be copied for formation of a next consistency group, and the second data structure is updated to indicate that that the second data structure is in an initialized state.
INTERNATIONAL BUSINESS MACHINES CORPORATION
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Theresa M. Michael T. Mark L.
Brown Benhase Lipets