Coordinated Co-allocator Model for Data Grid in Multi-sender Environment

We propose a model, which simultaneously allocates a data block request to the multiple sites, termed as co-allocation, to enable parallel data transfer in a grid environment. The model comprises of co-allocator, monitor and control mechanisms. The co-allocation scheme adapts well to the highly inconsistent network performances of the sites concerned. The scheme initially obtains the bandwidth parameter from the monitor module to fix the partition size and the data transfer tasks are allocated onto the servers in duplication. The scheme is found to be tolerant despite the situation that the link to servers under consideration is broken or become idle. We used Globus toolkit for our framework and utilized the partial copy feature of GridFTP. We compared our schemes with the existing schemes and the results show notable improvement in overall completion time of data transfer.