ISCSI Extensions for RDMA

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LIO Target
LIO 150513.png
InfiniBand iSER fabric module
Original author(s) Nicholas Bellinger
Developer(s) Datera, Inc.
Written in C
Operating system Linux
Type Fabric module
License GNU General Public License
See Target for a complete overview over all fabric modules.

iSCSI Extensions for RDMA (iSER) is a computer network protocol that extends the Internet Small Computer System Interface (iSCSI) protocol to use Remote Direct Memory Access (RDMA). Typically RDMA is provided by either the (TCP) with RDMA services (iWARP) or InfiniBand. It permits data to be transferred directly into and out of SCSI computer memory buffers (which connects computers to storage devices) without intermediate data copies.



An InfiniBand iSER fabric module for the Unified Target is currently being implemented as a joint development effort between Datera, Inc. and Mellanox. It is planned for release with Linux kernel version 3.9.


An RDMA consortium was announced on May 31, 2002 with a goal of product implementations by 2003.[1] The consortium released their proposal in July, 2003.[2] The protocol specifications were published as drafts in September 2004 in the Internet Engineering Task Force and issued as RFCs in October 2007.[3][4] The OpenIB Alliance was renamed in 2007 to be the OpenFabrics Alliance, and then released an open source software package.[5]


See also


  1. "Open Consortium Developing Specifications for Remote Direct Memory Access Over TCP/IP Networks". press release. May 31, 2002. 
  2. Mike Ko, et al. (July 2003). "iSCSI Extensions for RDMA Specification (Version 1.0)". 
  3. M. Ko et al. (October 2007). "Internet Small Computer System Interface (iSCSI) Extensions for Remote Direct Memory Access (RDMA)". RFC 5046. 
  4. M. Chadalapaka et al. (October 2007). "DA: Datamover Architecture for the Internet Small Computer System Interface (iSCSI)". RFC 5047. 
  5. "OpenFabrics Alliance". official web site. 

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Timeline of the LinuxIO
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4.x Version 4.0 4.1
Feature LIO Core Loop back FCoE iSCSI Perf SRP
vHost Perf Misc 16 GFC iSER Misc VAAI Misc DIF Core
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
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