iSCSI (SCSI over IP) is used to implement storage area network (SAN) technologies (ex SCSI) over TCP/IP. In traditional implementations, iSCSI has been implemented using the block level storage. This paper emphasizes on the implementation of iSCSI based on Object-storage instead of block level storage by which the speed and security can be improvised, there by enhancing the performance. This research work also includes implementing the Object-storage based iSCSI, analyzing T10-OSD standard command set. In most of the operating systems, automatic TCP window tuning is implemented, but these available tcp window tuning methods are not optimal for all the available protocols In this paper, using the iSCSI protocol, the author made a careful study to figure out which iSCSI parameters effect the TCP window, and also determines the mathematical model for achieving the optimal TCP window size for iSCSI protocol.