Replicating tracks from a first storage site to a second and third storage sites

摘要

Provided are a computer program product, system, and method for replicating tracks from a first storage to a second and third storages. A determination is made of a track in the first storage to transfer to the second storage as part of a point-in-time copy relationship and of a stride of tracks including the target track. The stride of tracks including the target track is staged from the first storage to a cache according to the point-in-time copy relationship. The staged stride is destaged from the cache to the second storage. The stride in the cache is transferred to the third storage as part of a mirror copy relationship. The stride of tracks in the cache is demoted in response to destaging the stride of the tracks in the cache to the second storage and transferring the stride of tracks in the cache to the third storage.

主权项

1. A computer program product for copying data from a first storage to a second storage and a third storage, wherein a cache is used to cache data for the second storage, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that executes to cause operations, the operations comprising:
providing a point-in-time copy relationship to copy tracks as of a point-in-time in the first storage to the second storage; providing a mirror copy relationship to copy data in the second storage to the third storage; determining a target track in the first storage to transfer to the second storage as part of the point-in-time copy relationship; determining a stride of tracks including the target track; staging the stride of tracks including the target track from the first storage to the cache according to the point-in-time copy relationship; destaging the staged stride from the cache to the second storage; transferring the stride in the cache to the third storage as part of the mirror copy relationship; and demoting the stride of tracks in the cache in response to destaging the stride of the tracks in the cache to the second storage and transferring the stride of tracks in the cache to the third storage.