A Method for Cloud Storage Data Recovery with Limited Loss of Access

In this paper, the problem of recovering data stored in remote storage facilities is addressed, where user data are distributed in storage nodes, each possessing the same number of storage units. The problem addressed is getting uninterrupted data availability in the commonly occurring case where loss of access is temporary towards an entire data storage node, or concerns up to two data storage units located at different nodes. The backup procedure is explained and details are given about the calculations necessary for calculating the necessary checksums. The theoretical general form of the calculation of the data recovery in all instances is given. The scheme is illustrated via an arithmetic example.