Copying data from mirrored storage to auxiliary storage arrays co-located with primary storage arrays

A method, comprising:

• receiving, by a processor, a subset of data mirrored on a remote site
• storing the subset of data in an array of auxiliary storage devices;
• and
• using a second storage device in the array of auxiliary storage devices storing the subset of the data on the primary site to restore a first storage device of an array of primary storage devices in response to an error being detected in the first storage device,
• wherein the subset of data corresponds to original data stored on the first storage device.

A computer program product comprising a computer-readable storage medium including program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:

• receive a subset of data mirrored on a remote site;
• store the subset of data in an array of auxiliary storage devices;
• and
• use a second storage device in the array of auxiliary storage devices storing the subset of the data on the primary site to restore a first storage device of an array of primary storage devices in response to an error being detected in the first storage device,
• wherein the subset of data corresponds to original data stored on the first storage device.