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The Linux-IO Target (LIO) is an open-source Small Computer System Interface (SCSI) target implementation included with the Linux kernel. [1]Unlike initiators, which begin sessions, LIO functions as a target, presenting one or more Logical Unit Numbers (LUNs) to a SCSI initiator, receiving SCSI commands, and managing the input/output data transfers.
SCSI was introduced in the 1980s and has seen widespread use on servers and high-end workstations, with new SCSI standards being published as recently as SAS-4 in 2017. The SCSI standards define commands, protocols, electrical, optical and logical interfaces. The SCSI standard defines command sets for specific peripheral device types; the ...
Real servers: nodes that make up an LVS cluster which are used to provide services on the behalf of the cluster; Client computers: computers requesting services from the virtual server; VIP (Virtual IP address): the IP address used by the director to provide services to client computers
As in a client–server architecture, an initiator is analogous to the client, and a target is analogous to the server. Each SCSI address (each identifier on a SCSI bus) displays behavior of initiator, target, or (rarely) both at the same time. There is nothing in the SCSI protocol that prevents an initiator from acting as a target or vice versa.
From the computer perspective, SCSI LUN is only a part of the full SCSI address. The full device's address is made from the: c-part: controller ID of the host bus adapter, t-part: target ID identifying the SCSI target on that controller, d-part: disk ID identifying a LUN on that target, s-part: slice ID identifying a specific partition on that ...
The IBM POWER virtual SCSI client driver for Linux (ibmvscsi), available since January 2008 (kernel version 2.6.24 [11]). Virtual SCSI allows client logical partitions to access I/O devices (disk, CD, and tape) that are owned by another logical partition. [12] [13] The following SRP target implementations exist: The SCST SRP target ...
The main concepts and terminology of the SCSI architectural model are: Only the externally observable behavior is defined in SCSI standards. The relationship between SCSI devices is described by a client-server service-delivery model. The client is called a SCSI initiator and the server is called a SCSI target.
It is not related to the Linux Virtual Server project, which implements network load balancing. Linux-VServer is a jail mechanism in that it can be used to securely partition resources on a computer system (such as the file system , CPU time, network addresses and memory) in such a way that processes cannot mount a denial-of-service attack on ...