D-Link DSN-3400-10 User's Manual for DSN-3200-10 Valid for firmware 1.6.1 - Page 165

Appendix G Acronyms and Abbreviations Administrator CHAP CSMA/CD Drive 802.3 Extent IETF Initiator node IP iSCSI The person responsible for managing storage operations. The administrator is the user who will use the storage management console provided with the xStack Storage. Challenge Handshake Authentication Protocol. CHAP is a protocol for authenticating the peer of a connection and is based upon the peers sharing a secret (a security key similar to a password). Carrier Sense Multiple Access/Collision Detection. The LAN access method used in Ethernet. When a device wants to gain access to the network, it checks whether the network is quiet (senses the carrier). If it is not, it waits a random amount of time before retrying. If the network is quiet and two devices access the line at exactly the same time, their signals collide. When the collision is detected, they both back off and each waits a random amount of time before retrying. A physical storage drive (usually, but not necessarily, a disk drive) managed by the xStack Storage system. An IEEE standard for a CSMA/CD local-area network access method, which is used in Ethernet, the most common LAN technology. A contiguous set of LBs on a drive. An extent is also called a physical extent. Internet Engineering Task Force. The main standards organization for the Internet. The IETF is a large open international community of network designers, operators, vendors, and researchers concerned with the evolution of the Internet architecture and the smooth operation of the Internet. It is open to any interested individual. An iSCSI node that performs as an iSCSI Initiator in accessing data stored on the xStack Storage system. Internet Protocol. IP specifies the format of packets, or "datagrams," and the addressing scheme. Most networks combine IP with a higher-level protocol called Transmission Control Protocol (TCP), which establishes a virtual connection between a destination and a source. IP by itself is something like the postal system. It allows you to address a package and drop it in the system, but there's no direct link between you and the recipient. TCP/IP, on the other hand, establishes a connection between two hosts so that they can send messages back and forth for a period of time. The current version of IP is IPv4. Internet Small Computer System Interface. An IP-based standard for linking data storage devices over a network and transferring data by carrying SCSI commands over IP networks. iSCSI supports a Gigabit Ethernet interface at the physical layer that allows systems supporting iSCSI interfaces to connect directly to standard Gigabit Ethernet switches and/or IP routers. iSCSI was developed by the IETF and became an official standard in February 2003. xStack Storage User's Guide 165