In computer data storage, a SCSI initiator is the endpoint that initiates a SCSI session, that is, sends a SCSI command. The initiator usually does not provide any Logical Unit Numbers (LUNs).
On the other hand, a SCSI target is the endpoint that does not initiate sessions, but instead waits for initiators' commands and provides required input/output data transfers. The target usually provides to the initiators one or more LUNs, because otherwise no read or write command would be possible.
Typically, a computer is an initiator and a data storage device is a target. 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.
SCSI initiators are sometimes wrongly called controllers.[citation needed]
In most of these protocols, an address (whether it is initiator or target) is roughly equivalent to physical device's port. Situations where a single physical port hosts multiple addresses, or where a single address is accessible from one device's multiple ports are not very common, as of 2008[update]. Even when using multipath I/O to achieve fault tolerance, the device driver switches between different targets or initiators statically bound on physical ports, instead of sharing a static address between physical ports.
scsi, initiator, target, this, article, does, cite, sources, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, 2009, learn, wh. This article does not cite any sources Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources SCSI initiator and target news newspapers books scholar JSTOR December 2009 Learn how and when to remove this message In computer data storage a SCSI initiator is the endpoint that initiates a SCSI session that is sends a SCSI command The initiator usually does not provide any Logical Unit Numbers LUNs On the other hand a SCSI target is the endpoint that does not initiate sessions but instead waits for initiators commands and provides required input output data transfers The target usually provides to the initiators one or more LUNs because otherwise no read or write command would be possible Contents 1 Detailed information 2 Other protocols 3 Address versus port 4 See alsoDetailed information editTypically a computer is an initiator and a data storage device is a target 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 SCSI initiators are sometimes wrongly called controllers citation needed Other protocols editInitiator and target terms are applicable not only to traditional parallel SCSI but also to Fibre Channel Protocol FCP iSCSI see iSCSI target HyperSCSI in some sense SATA ATA over Ethernet AoE InfiniBand DSSI and many other storage networking protocols Address versus port editIn most of these protocols an address whether it is initiator or target is roughly equivalent to physical device s port Situations where a single physical port hosts multiple addresses or where a single address is accessible from one device s multiple ports are not very common as of 2008 update Even when using multipath I O to achieve fault tolerance the device driver switches between different targets or initiators statically bound on physical ports instead of sharing a static address between physical ports See also editMaster slave technology SCSI architectural model iSCSI target nbsp This computer storage related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title SCSI initiator and target amp oldid 1149063893, wikipedia, wiki, book, books, library,
