Data mirror volume verification

An apparatus, comprising:

• a data mirror module that generates a plurality of volume pairs of first and second volumes by mirroring track data of a plurality of first volumes from a first storage device at a first site to a second storage device at a second site, wherein the track data from the plurality of first volumes is mirrored as mirrored track data and stored in a plurality of second volumes in the second storage device at the second site;
• an activity monitor module that reads the track data from each of the first volumes during mirroring and determines whether the track data being mirrored from each of the first volumes is in-transit from the first storage device to the second storage device, wherein:
• if the track data being mirrored is in-transit, then the activity monitor module captures the track data being mirrored while in-transit from the first storage device to the second storage device, and
• if the mirrored track data is not in-transit, then the activity monitor module reads the mirrored track data from the second volume that is stored in the second storage device at the second site;
• and
• a data verification module that performs a verification task of the plurality of volume pairs, wherein verification of a volume pair in the plurality of identified volume pairs is performed in parallel with verification of at least one other volume pair in the plurality of identified volume pairs, the verification task performed by comparing the track data from each of the first volumes in volume pairs to the mirrored track data from each of the second volumes in volume pairs, wherein:
• if the track data from each of the first volumes corresponds to the mirrored track data from each of the second volumes, then the data verification module identifies the verification task as successful, and
• if the track data from each of the first volumes fails to correspond to the mirrored track data from each of the second volumes, then the data verification module identifies the verification task as unsuccessful and re-copies the track data from each of the first volumes to each of the second volumes so as to repair the mirrored track data in each of the second volumes,
• wherein at least a portion of the modules comprise one or more of hardware circuits, programmable hardware devices, and executable code, the executable code stored on one or more computer readable storage media.

A method, comprising:

• generating volume pairs of first and second volumes by mirroring track data from a plurality of first volumes stored by a first storage device at a first site to a plurality of second volumes as mirrored track data stored by a second storage device at a second site that is different than the first site;
• monitoring update activities for the volume pairs;
• identifying volume pairs having substantial residual counts of update activities as indicated by a pre-determined residual count threshold;
• determining whether the track data being mirrored is in-transit, and if the track data being mirrored is in-transit, then capturing the track data being mirrored while in-transit;
• selecting one or more of the identified volume pairs for evaluation, wherein the evaluation of a volume pair in the identified volume pairs is performed in parallel with the evaluation of at least one other volume pair in the plurality of identified volume pairs;
• comparing the track data in each of the first volumes in volume pairs to the mirrored track data in each of the second volumes in volume pairs;
• and
• if a match discrepancy is determined, then re-copying the track data from each of the first volumes in volume pairs to each of the second volumes in volume pairs so as to correct and repair the mirrored track data in each of the second volumes in volume pairs.