Transition Mechanisms for IPv6 Hosts and Routers Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
The initial iSCSI products provide a means to connect FC SAN islands across IP networks. This paper describes the implementation of an IP-SAN where the disk subsystem is a virtual array of individually Ethernet attached IP-addressable disks. By replacing the conventional peripheral bus and loop interconnects with a switched Gigabit Ethernet network, the virtual disk array scales continually and dynamically with the simple addition of Ethernet switches and disks, as well as system-wide disk sparing and inherent high availability. In fully exploiting the IP and Ethernet technologies and user knowledge, this architecture pushes the IP SAN evolution toward a truly scalable, manageable, yet flexible and cost-effective data storage system that will be a seamless part of the networked infrastructure. IntroductionMuch industry effort has gone into defining the iSCSI standards [1] and developing associated products [2]. The initial application of iSCSI products is in bridging the IP and the Fibre Channel (FC) worlds. The industry expects the long-term payoff to be a much lower cost IP SAN that will fill the gaps left open by the expensive and complex FC SAN implementations.The full benefit of IP SAN [3-7] is well beyond the projected low acquisition cost. In this paper, we discuss an IP SAN architecture and implementation that exploits the capabilities, trends and wide spread knowledge base of IP and Ethernet networks to form the framework for building intelligent IP SANs. These SANS will deliver inherently scalable, distributed virtual storage services as a native part of the IP infrastructure that can be managed centrally.By deconstructing the conventional peripheral bus and loop interconnects based RAID subsystem structure, this IP SAN architecture utilizes the standard gigabit Ethernet (GbE) network as the interconnect fabric and individually IP-addressable disks to achieve fully virtualized storage arrays. IP-SAN Top to BottomThe first generation iSCSI storage arrays are primarily existing FC RAID arrays with GbE interface and iSCSI target support or a NAS subsystem with the addition of an iSCSI target. We extend the basic IP connectivity concept inside the storage subsystem to create a SAN architecture that employs IP from the application hosts to the storage array controller and then to the IP-addressable disks. MotivationPutting disks directly onto the Ethernet network and making them IP addressable yield a number of benefits. The use of switched Ethernet breaks the limitation of internal busses and loops of the conventional storage arrays. One can extend and expand the switched network easily and quickly while riding the price/performance improvement trends of Ethernet.All of the IP disks are reachable by the storage controllers that are on the same IP network. As such, the IP disks form a single storage pool and disk sparing becomes network-wide and is not limited to a specific RAID controller. Storage capacity can be expanded and reconfigured by plugging additional IP disks into the network without impacting th...
This paper describes the file format used by "snoop", a packet monitoring and capture program developed by Sun. This paper is provided so that people can write compatible programs to generate and interpret snoop packet capture files.
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