iSCSI

Overview

An Internet Small Computer System Interface (iSCSI) is an Internet Protocol (IP) based storage networking standard that is used to link various data storage facilities. It enables remote accessover a TCP/IP line and is mainly used for business applications. These iSCSI connections are capable of connecting Small Computer System Interface (SCSI) devices to systems. Commands are transferred to SCSI devices that enable transmission and storage of data over long distances. This system interface increases the capacity and performance of data transmission and storage, thereby enabling data to be carried over long distances on a location independent basis.

An Internet Protocol Suite (TCP/IP) and iSCSI are connected to each other for data transmission. The rate of data transfer across this interface can be increased using a Gigabit Ethernet modem.

Benefits

The primary benefit of iSCSI is easy accessibility to data. An iSCSI connection enables SCSI devices to either store or retrieve data over an Internet connection at high speeds. With an iSCSI connection, you can easily access files and documents when on the move or while at a business meeting. An iSCSI interface is used with a storage area network (SAN) to organize and consolidate storage options into data center storage arrays. Systems also provide hosts like web servers and databases options to store information. Another advantage is that iSCSI systems can be built over existing network infrastructure in an efficient and cost-effective way.

How It Works

Internet Small Computer System Interfaces use TCP/IP and allow two hosts to negotiate and exchange SCSI over an IP network. Applications and requests that are sent by users are handled by the operating system, which generates an appropriate SCSI response. The system retrieves relevant data, which is then encrypted and encapsulated. A data packet is generated, suitable headers are added, and the information is sent over the network. When the data packet is received by the end user, it is decrypted and then disassembled. SCSI commands and requests are separated from one another. The system sends SCSI commands to the SCSI controller and then to the SCSI storage device. Since an iSCSI protocol is bi-directional, the protocol is capable of handling both sending and receiving data at the same time. Since iSCSI runs over Internet Protocol, it is more effective than Fiber Channel Technology.

An iSCSI SAN is used for two purposes: data consolidation and disaster recovery. It is used to move stored information from servers to central locations. This kind of data consolidation is effective because it does not require new cabling or hardware to transfer the data.

Companies/Brands

There are a number of companies that manufacture iSCSI and SCSI routers and switches. IBM, Cisco, Apple, and Dell manufacture iSCSI devices.