LIO

The Linux SCSI Target Wiki

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** [[QLogic]] ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core.git;a=tree;f=drivers/scsi/qla2xxx;hb=HEAD tcm_qla2xxx.ko], released).
** [[QLogic]] ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core.git;a=tree;f=drivers/scsi/qla2xxx;hb=HEAD tcm_qla2xxx.ko], released).
* {{anchor|ibmvscsis|IBM vSCSI}} '''[[IBM vSCSI]]''' (RC): [http://www.ibm.com IBM] virtual SCSI (vSCSI) module for [http://www-03.ibm.com/systems/p/ IBM System p].
* {{anchor|ibmvscsis|IBM vSCSI}} '''[[IBM vSCSI]]''' (RC): [http://www.ibm.com IBM] virtual SCSI (vSCSI) module for [http://www-03.ibm.com/systems/p/ IBM System p].
 +
* {{anchor|1394}} iEEE 1394 (released).
* {{anchor|IB}} '''[[InfiniBand]]''': support for Infiniband Host Channel Adapters (HCAs).
* {{anchor|IB}} '''[[InfiniBand]]''': support for Infiniband Host Channel Adapters (HCAs).
** {{anchor|SRP}} [http://www.mellanox.com Mellanox] [[SCSI RDMA Protocol|SRP]] ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core.git;a=blob;f=drivers/infiniband/ulp/srpt/ib_srpt.c;hb=HEAD ib_srpt.ko], released).
** {{anchor|SRP}} [http://www.mellanox.com Mellanox] [[SCSI RDMA Protocol|SRP]] ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core.git;a=blob;f=drivers/infiniband/ulp/srpt/ib_srpt.c;hb=HEAD ib_srpt.ko], released).
* {{anchor|SAS}} '''[[Serial Attached SCSI|SAS]]''': Marvell (development).
* {{anchor|SAS}} '''[[Serial Attached SCSI|SAS]]''': Marvell (development).
* {{anchor|tcm_loop}} '''[[tcm_loop]]''' ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=tree;f=drivers/target/loopback;hb=HEAD tcm_loop.ko], released): This high-speed 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 emulation of advanced functionality, such as [[Persistent Reservations|PRs]], [[Asymmetric Logical Unit Assignment|ALUA]], etc.
* {{anchor|tcm_loop}} '''[[tcm_loop]]''' ([http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=tree;f=drivers/target/loopback;hb=HEAD tcm_loop.ko], released): This high-speed 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 emulation of advanced functionality, such as [[Persistent Reservations|PRs]], [[Asymmetric Logical Unit Assignment|ALUA]], etc.
-
 
+
* {{anchor|USB}} USB Gadget (released).
== {{anchor|Backstores}} Backstores ==
== {{anchor|Backstores}} Backstores ==

Revision as of 20:10, 16 June 2012

LIO Target
Logo
LIO 150513.png
LIO Unified Target
Original author(s) Nicholas Bellinger
Developer(s) Datera, Inc.
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
LIO architecture overview.
LIO iSCSI architecture diagram.
SCSI Portal Group and multipath architecture overview.
SCSI standards diagram.
TCM_QLA2xxx running at line rate HW target mode from with PCIe device passthrough with MSI-X polled interrupts across Linux/SCSI qla2xxx LLD request and response rings
TCM v4.0 QLAXXX prototype using PCIe device passthrough for target mode MSI-X interrupts, and QEMU Megasas HBA emulation into Windows7 64-bit guest.
FILEIO with a Tcm_loop SCSI port on KVM x86_64 host running v2.6.36-rc3+ with QEMU lsi53c895a HBA emulation into an OS/2 Warp v4 guest. A HPFS partition has been formatted and mounted as DRIVE D:

The Target (target_core_mod.ko) is the engine of LIO Unified Target, which has become the new Linux standard with kernel version 2.6.38.[1][2] LIO Unified Target supports a wide range of platforms (from PC architecture to mobile devices, STBs and game consoles), based on a wide range of CPU architectures (x86, ia64, Alpha, Cell, PPC, ARM, MIPS, etc.), a growing number of fabric modules, and basically all existing Linux block devices for backstores.

The LIO SCSI engine implements a comprehensive SPC-3/SPC-4 feature set with support for high-end SCSI features in a fabric-agnostic way, such as Persistent Reservations (PR) and Asymmetric Logical Unit Assignment (ALUA) as being used by VMware ESX 4 and vSphere 4.

The LIO Target engine went upstream into the Linux 2.6.38 kernel on 1/14/2011.[3]

Contents

Setup

targetcli (developed by Datera, Inc.) is a comprehensive, powerful, yet easy storage management tool that can efficiently handle complex LIO Target installations.

Rollout

The target and fabric modules have gone upstream into the Linux kernel as follows:

Fabric modules

The LIO Fabric Hardware Abstraction Layer (F-HAL) allows all protocol-specific processing to be encapsulated in fabric modules, and thus can also accommodate novel fabric technologies and requirements:

Backstores

A backstore subsystem plugin is a physical storage object that provides the actual storage underlying an SCSI Endpoint. Backstore objects can be added via the Storage Hardware Abstraction Layer (S-HAL) that brings storage hardware into the Target engine as raw block devices, on which the full Linux stack just works (including complex functionality such as software RAID, the LVM, snapshots, virtualization, etc.).

The Target supports the SCSI-3 standard for all backstore devices (block devices and/or VFS):

The SCSI functionality is implemented directly in the target engine in a fabric agnostic way, including a number of high-end features, such as Persistent Reservations (PRs) and Asymmetric Logical Unit Assignment (ALUA), which have been available with LIO 3, following the SPC-4 standard.

Specifications

The following specifications are available as T10 Working Drafts:

Glossary

RFCs

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

See also

Notes

  1. Thorsten Leemhuis (3/2/2011). "Kernel Log: Coming in 2.6.38 (Part 4) - Storage". Heise Online. 
  2. Jonathan Corbet (12/22/2010). "Shooting at SCSI targets". lnw.net. 
  3. Nic Bellinger (1/24/2011). "[ANNOUNCE]: TCM/LIO v4.0.0-rc7 for 2.6.38-rc2". lkml.org. 
  4. Linus Torvalds (3/14/2011). "Linux 2.6.38". lkml.org. 
  5. Linus Torvalds (1/14/2011). "Target merge". lkml.org. 
  6. Linus Torvalds (5/18/2011). "Linux 2.6.39". lkml.org. 
  7. Linus Torvalds (7/21/2011). "Linux 3.0". lkml.org. 
  8. Linus Torvalds (10/24/2011). "Linux 3.1". lkml.org. 
  9. Linus Torvalds (7/27/2011). "iSCSI merge". lkml.org. 
  10. Linus Torvalds (3/18/2012). "Linux 3.3". lkml.org. 
  11. Linus Torvalds (1/18/2012). "InfiniBand/SRP merge". lkml.org. 
  12. Linus Torvalds (5/31/2012). "scsi-misc". lkml.org. 
  13. Linus Torvalds (5/22/2012). "usb-target-merge". lkml.org. 
  14. Linus Torvalds (5/23/2012). "sbp-target-merge". lkml.org. 

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