iSCSI 协议概念与实施
白皮书 作者： Cisco(思科) 2006-11-10
摘 要：
This white paper describes the concepts and implementation of the Internet draft proposal for the mapping of Small Computer Systems Interface (SCSI) commands, data, and status over TCP/IP networks. iSCSI is an SCSI transport protocol for mapping of block-oriented storage data over TCP/IP networks. This white paper covers standardization efforts along with the high-level mechanics of iSCSI, including naming, addressing and discovery, sessions and connections, and current issues such as performance and data integrity.
The iSCSI protocol enables universal access to storage devices and storage-area networks (SANs) over standard Ethernet-based TCP/IP networks. These networks may be dedicated networks or may be shared with traditional Ethernet applications. IP LAN/wide-area network (WAN) routers and switches can be used to extend the IP storage network to the wide area for applications such as synchronous and asynchronous remote disk copy or tape backup and restore. In the WAN environment, TCP will ensure data reliability, manage network congestion, and adapt retransmission strategies to WAN delays.
IP Ethernet network infrastructures provide major advantages for interconnection of servers to block-oriented storage devices. IP networks provide security, scalability, interoperability, network management, storage management, and is cost-effective.
IP network advantages:
. The availability of network protocols and middleware for the management, security, and quality of service (QoS).
. Skills developed in the design and management of IP local-area network (LAN) networks can be applied to native IP SANs. Trained and experienced IP networking staffs are available to install and operate these networks.
. Economies achieved from using a standard IP infrastructure, products, and service across the organization.
? SANs are complex to design, lacking interoperability, and have high implementation costs.
. Gigabit Ethernet switches and routers have advanced capabilities including: ultra low error rates, flow control, link aggregation, and full duplex operation.
? Transfer data at optimal data rates over LAN, WAN, and metropolitan-area networks (MANs).
. iSCSI is compatible with existing Ethernet and IP WAN infrastructures.
. iSCSI will coexist with other IP protocols on a network infrastructure.
This white paper describes the concepts and implementation of the Internet draft proposal for the mapping of Small Computer Systems Interface (SCSI) commands, data, and status over TCP/IP networks. iSCSI is an SCSI transport protocol for mapping of block-oriented storage data over TCP/IP networks. This white paper covers standardization efforts along with the high-level mechanics of iSCSI, including naming, addressing and discovery, sessions and connections, and current issues such as performance and data integrity.
The iSCSI protocol enables universal access to storage devices and storage-area networks (SANs) over standard Ethernet-based TCP/IP networks. These networks may be dedicated networks or may be shared with traditional Ethernet applications. IP LAN/wide-area network (WAN) routers and switches can be used to extend the IP storage network to the wide area for applications such as synchronous and asynchronous remote disk copy or tape backup and restore. In the WAN environment, TCP will ensure data reliability, manage network congestion, and adapt retransmission strategies to WAN delays.
IP Ethernet network infrastructures provide major advantages for interconnection of servers to block-oriented storage devices. IP networks provide security, scalability, interoperability, network management, storage management, and is cost-effective.
IP network advantages:
. The availability of network protocols and middleware for the management, security, and quality of service (QoS).
. Skills developed in the design and management of IP local-area network (LAN) networks can be applied to native IP SANs. Trained and experienced IP networking staffs are available to install and operate these networks.
. Economies achieved from using a standard IP infrastructure, products, and service across the organization.
? SANs are complex to design, lacking interoperability, and have high implementation costs.
. Gigabit Ethernet switches and routers have advanced capabilities including: ultra low error rates, flow control, link aggregation, and full duplex operation.
? Transfer data at optimal data rates over LAN, WAN, and metropolitan-area networks (MANs).
. iSCSI is compatible with existing Ethernet and IP WAN infrastructures.
. iSCSI will coexist with other IP protocols on a network infrastructure.
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