Open-iSCSI is a free implementation of the Internet Small Computer System Interfaces (iSCSI).
iSCSI enables the use of the established SCSI (Small Computer System Interface) storage protocol via the internet protocol. This enables access to the storage independent of location. No new hardware needs to be purchased as the existing network infrastructure is used for communication. Access to the storage devices is completely transparent from a user perspective; it looks exactly like accessing a local storage system.