iSCSI Computer Storage

iSCSI, in contrast, enables IP-native SANs. iSCSI solutions consist of iSCSI initiators in the server, connected to iSCSI targets (native iSCSI storage systems), by means of standard Gigabit Ethernet infrastructure (switches and cables). iSCSI is particularly interesting for storage consolidation solutions for server applications in environments where simplicity, flexibility, and price/performance are critical IT decision factors. It is also an excellent basis for cost effective and efficient backup and disaster recovery solutions.

iSCSI brings Ethernet economics to storage. Ethernet switching components are on average 30% to 50% of the cost of their FC counterparts, amortizing the economies of scale of billions of IP ports deployed worldwide. As with all of the IP storage protocols, iSCSI administration requires only the familiar networking expertise of IP networks – the standard skill set required of every IT admin. iSCSI leverages IP’s proven record of hardware interoperability, giving decision makers the flexibility of choosing from multiple vendors and sources.

The IETF implemented multiple security layers within iSCSI making it the most secure storage network protocol. These security measures are based on mature standards such as IPSec and CHAP. Administrators have the flexibility of implementing various layers of security within the iSCSI SAN based on business needs.

With iSCSI, administrators have three options to choose from when connecting servers to the storage: Software Initiators, Software Initiators with TOE cards, and iSCSI Host Bus Adapters (HBAs). The Software Initiators are free drivers available from the Operating System vendors. They can use either regular Ethernet server ports, NIC cards or accelerated TOE cards (TCP/IP Offload Engines). The iSCSI HBA offloads the entire iSCSI and networking stack onto the hardware adaptor.

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