LIO

The Linux SCSI Target Wiki

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LIO supports advanced iSCSI features, such as [[Persistent Reservations]] (PR), [[ALUA]], [[Multiple Connections per Session|MC/S]] and [[Error Recovery Level#2|ERL=2]].
LIO supports advanced iSCSI features, such as [[Persistent Reservations]] (PR), [[ALUA]], [[Multiple Connections per Session|MC/S]] and [[Error Recovery Level#2|ERL=2]].
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The high-speed [[tcm_loop]] SCSI emulation device can serve any type of raw hardware to local applications and virtual machines as a fully SPC-4 compliant block SCSI device, including [[Persistent Reservations|PR]], [[ALUA]], etc. emulation.
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The high-speed [[tcm_loop]] SCSI emulation device can serve any type of raw hardware to local applications and virtual machines as a fully SCSI SPC-4 compliant block device, including [[Persistent Reservations|PR]], [[ALUA]], etc. emulation.
== Standards compliance ==
== Standards compliance ==

Revision as of 16:26, 29 November 2010

The Target is the generic multiprotocol target engine of LIO. Template:AdSense right

Contents

Overview

LIO Target
Logo
RisingTide Systems
Multiprotocol Target Engine
Original author(s) Nicholas Bellinger
Developer(s) RisingTide Systems LLC
Initial release January 14, 2011 (2011-01-14)
Stable release 4.1.0 / June 20, 2012;
7 years ago
 (2012-06-20)
Preview release 4.2.0-rc5 / June 28, 2012;
7 years ago
 (2012-06-28)
Development status Production
Written in C
Operating system Linux
Type Target engine
License GNU General Public License
Website datera.io
SCSI Portal Group architecture overview.
LIO iSCSI architecture diagram.
SCSI standards diagram.

The LIO target (target_core_mod.ko) is the generic multiprotocol target engine of LIO.

Architecturally, it can run on a number of different Linux environments, allows access to storage objects from the SCSI, block and VFS subsystems (such as Target/PSCSI, Target/IBLOCK, Target/FILEIO, Target/RAMDISK), and it operates with a number of protocol-specific fabric modules (such as iSCSI, FCoE, Fibre Channel, InfiniBand).

LIO supports advanced iSCSI features, such as Persistent Reservations (PR), ALUA, MC/S and ERL=2.

The high-speed tcm_loop SCSI emulation device can serve any type of raw hardware to local applications and virtual machines as a fully SCSI SPC-4 compliant block device, including PR, ALUA, etc. emulation.

Standards compliance

The Target supports the SCSI-3 standard for storage devices from Target/IBLOCK, Target/FILEIO, Target/PSCSI, and Target/RAMDISK subsystem plugins. Some of the most notable functionality includes Persistent Reservations (PR) and ALUA, which have been implemented in LIO 3.0, following the SPC-4 standard.

SCSI-3 and greater revisions are supported using the Target/PSCSI subsystem plugin for Linux/SCSI passthrough, but only from control CDBs capable by the device firmware.

Setup

The LIO 3.0 CLI manual describes a simple userspace shell (lio-utils) for LIO v3.0 (Target+iSCSI). It also describes how to setup a number of different subsystem storage object backstores for LIO LUN endpoints:

RisingTide Systems makes available upon request and for free RTSadmin, a comprehensive, powerful, yet easy storage management tool that can efficiently handle even complex LIO installations.

Lastly, the Target engine configuration is mapped into Target/configFS, where it can be configured manually from user space by using inter- and intra-module symbolic links.

Specifications

The following specifications are available as T10 Working Drafts:

Glossary

Timeline

Timeline of the LinuxIO
Release Details 2011 2012 2013 2014 2015
123456789101112 123456789101112 123456789101112 123456789101112 123456789101112
4.x Version 4.0 4.1
Feature LIO Core Loop back FCoE iSCSI Perf SRP
CM WQ FC
USB
1394
vHost Perf Misc 16 GFC iSER Misc VAAI Misc DIF Core
NPIV
DIF iSER DIF FC vhost TCMU Xen Misc Misc virtio 1.0 Misc NVMe OF
Linux 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22

Wikipedia entries

RFCs

See also

Notes

External links

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