Implementation and Evaluation of Consistent Online Backup in Transactional File Systems

In order to address this issue, we propose a scheme which is referred to as mutual serializability assuming that the file system support transactions. Mutual serializability captures a consistent backup of an active file system by ensuring that the backup transaction is mutually serializable with every other transaction individually. This mutually serializable relationship is established considering an extended set of conflicting operations which include read-read conflicts. User transactions serialize within themselves using some standard concurrency control protocol such as the Strict 2PL and a set of conflicting operations that only include the traditional read-write, write-write and write-read conflicts.