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In computing, Linux-IO (LIO) Target is an open-source implementation of the SCSI target that has become the standard one included in the Linux kernel. Internally, LIO does not initiate sessions, but instead provides one or more Logical Unit Numbers (LUNs), waits for SCSI commands from a SCSI initiator, and performs required input/output data transfers. LIO supports common storage fabrics, including FCoE, Fibre Channel, IEEE 1394, iSCSI, iSCSI Extensions for RDMA (iSER), SCSI RDMA Protocol (SRP) and USB. It is included in most Linux distributions; native support for LIO in QEMU/KVM, libvirt, and OpenStack makes LIO also a storage option for cloud deployments.〔(【引用サイトリンク】author=IBM, Red Hat )〕 LIO is maintained by Datera, Inc., a Silicon Valley vendor of storage systems and software. On January 15, 2011, LIO SCSI target engine was merged into the Linux kernel mainline, in kernel version 2.6.38, which was released on March 14, 2011. Additional fabric modules have been merged into subsequent Linux releases. A competing generic SCSI target module for Linux is SCST. For the narrower purpose providing a Linux iSCSI target, the older IET and STGT modules also enjoy industry support.〔Florian Haas, "(Replicate Everything! Highly Available iSCSI Storage with DRBD and Pacemaker )", (Linux iSCSI: a Tale of Four Targets section) ''Linux Journal'' Issue #217, May 2012〕 ==Background== The SCSI standard provides an extensible semantic abstraction for computer data storage devices, and as such has become a "lingua franca" for data storage systems. The SCSI T10 standards define the commands and protocols of the SCSI command processor (sent in ''SCSI CDBs''), and the electrical and optical interfaces for various implementations. A ''SCSI initiator'' is the endpoint that initiates a SCSI session. A ''SCSI target'' is the endpoint that waits for initiator commands and executes the required I/O data transfers. The SCSI target usually exports one or more LUNs for initiators to operate on. The LIO Linux SCSI Target implements a generic SCSI target that provides remote access to most data storage device types over all prevalent storage fabrics and protocols. LIO neither directly accesses data nor does it directly communicate with applications. LIO provides a highly efficient, fabric-independent and fabric-transparent abstraction for the semantics of numerous data storage device types. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「LIO (SCSI target)」の詳細全文を読む スポンサード リンク
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