Implementing synchronization for remote disk mirroring

A system for implementing enhanced fast full synchronization for remote disk mirroring in a computer system comprising:

• a source storage and a target storage;
• a respective memory controller coupled to said source storage and said target storage,
• said respective memory controller providing a source backup copy locally available to the target for remote disk mirroring;
• said respective memory controller identifying sectors that are different between the source and target using a hash function over a block to be compared, with an adaptive number of tracking sectors per block, starting with a minimum block size;
• said respective memory controller, in response to hashes matching between source and target, increasing a block size by an integral number of tracking sectors;
• and
• said respective memory controller, in response to hashes not matching between source and target, setting the block size to the minimum tracking block size.