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

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:

• transferring a stride of tracks including a target track in a first storage to the second storage;
• transferring the from the second storage to the third storage;
• and
• indicating the stride of tracks as eligible for demotion from a cache in response to transferring the stride of tracks in the cache to the third storage.

A system in communication with a first storage, a second storage, a third storage, and a cache, comprising:

• at least one processor;
• and
• at least one computer readable storage media including at least one computer program executed by the at least one processor to cause operations, the operations comprising:
• transferring a stride of tracks including a target track in the first storage to the second storage;
• transferring the stride from the second storage to the third storage;
• and
• indicating the stride of tracks as eligible for demotion from a cache in response to transferring the stride of tracks in the cache to the third storage.

A method for copying data from a first storage to a second storage and a third storage, comprising:

• transferring a stride of tracks including a target track in a first storage to the second storage;
• transferring the stride from the second storage to the third storage;
• and
• indicating the stride of tracks as eligible for demotion from a cache in response to transferring the stride of tracks in the cache to the third storage.