Definition: Internet Small Computer System Interface (iSCSI) is an IP-based storage networking standard for linking data storage facilities, developed by the Internet Engineering Task Force (IETF).
When an end user or application sends a request, the operating system generates the appropriate SCSI commands and data request, which then go through encapsulation and encryption procedures. A packet header is added before the resulting IP packets are transmitted over an Ethernet connection. When a packet is received, it is decrypted and disassembled, separating the SCSI commands and request. The SCSI commands are then sent on to the SCSI controller and from there to the SCSI storage device.