Koliada K. Method and tools for increasing the efficiency of recovering of data lost during remote storage and transmission in networks

The dissertation is devoted to the problem of increasing the efficiency of data recovery, lost during their remote storage in distributed systems or during transmission over global networks. The analysis of factors affecting for efficiency of data recovery lost during their long-term storage on remote distributed systems, as well as in the process of their transmission over global networks is carried out in the work. Recovery of data lost during storage is carried out at the expense of backup data, which is also stored on remote distributed systems. Recovery of lost or delayed over a critical period of time data during transmission in networks is also carried out by transmitting backup information along with the main.The main emphasis in the dissertation research have been maid on increasing the speed of recovery of lost data and reducing the amount of backup data by taking into account the features of real systems for remote storage of user data. To accelerate the recovery of data lost during remote storage, a method based on the use of sparse matrices for the formation of backup blocks has been developed. In real systems for remote storage of user information and computer management systems for remote objects using the Internet as a medium of data exchange, the time of recovery of lost information blocks or delayed delivery of critical data packets plays an important role. An effective technological solution for the recovery of lost information blocks on the basis of previously created tables of specifications is proposed. Due to the optimization of the choice of the reconstruction option and the use of precomputations, the acceleration of lost blocks recovery by 10-15% is achieved.