Real time project! Distributed Transactional File Systems !!

We propose a formal framework for modeling and analyzing the consistent online backup problem and its solution. The formalism for a consistent online backup utilizes a flat file system model accessed through a transactional interface with a transaction comprising of a sequence of logically related file read and write operations. A backup transaction comprises of a sequence of reads to every file in the file system and it executes concurrently with other user transactions. Serializability being the accepted notion of correctness for concurrently executing transactions, a consistent backup copy is read by serializing the backup transaction with the user transactions. But, as the backup transaction reads every file in the file system, making use of standard concurrency control methods like two phase locking and optimistic algorithms, proves to be extremely costly. Hence, assuming user transactions serialize among themselves using concurrency control methods like two-phase locking, we propose and prove that a backup transaction reads a consistent file system copy by keeping itself serialized with each concurrently executing transaction separately.www.fu-vision .com
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