A method for generating one or more hashes for one or more data blocks is provided. The method receives a data block to write on at least one physical disk of a set of physical disks associated with a set of host machines. The method then calculates a hash for the received data block and writes a first entry to a data log in a cache disk, the first entry comprising a first header and data indicative of the received block, the first header comprising the hash. The method further writes the data to the at least one physical disk as part of data blocks of a stripe, and stores the hash in a summary block on the at least one physical disk. The summary block is associated with the data blocks of the stripe stored on the at least one physical disk.