Data Error Identification Prior to Role Reversal on a Remote Data Replication Facility

A system for data error identification prior to role reversal on a remote data replication facility, comprising:

• one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising:
• implementing a remote data replication facility including a primary storage array and a backup storage array;
• replicating filesystems included in a remote data replication group on the remote data replication facility from the primary storage array to the backup storage array, each filesystem being stored on a first plurality of tracks of backend storage resources of the primary storage array and being stored on a respective second plurality of tracks of backend storage resources of the backup storage array;
• servicing host IO operations on the filesystems by the primary storage array from data stored in the first plurality of tracks of the backend storage resources of the primary storage array;
• identifying an upcoming role reversal event on the remote data replication facility, the role reversal event being associated with a change on the remote data replication facility after which the backup storage array will be responsible for servicing subsequent host IO operations on the filesystems using data stored in the respective second plurality of tracks of the backend storage resources of the backup storage array;
• in response to identifying the upcoming role reversal event, implementing a comparison of the first plurality of tracks of the backend storage resources of the primary storage array with corresponding second plurality of tracks of the backend storage resources of the backup storage array, the comparison being implemented before implementing the role reversal event;
• and
• after completion of the comparison of the first plurality of tracks of the backend storage resources of the primary storage array with corresponding second plurality of tracks of the backend storage resources of the backup storage array, implementing the role reversal event.