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Chapter VII. iSCSI PDU Offload Target

1. Introduction

This section describes how to install and configure iSCSI PDU Offload Target software for use

as a key element in your iSCSI SAN. The software runs on Linux-based systems that use

Chelsio or non-Chelsio based Ethernet adapters. However to guarantee highest performance,

Chelsio recommends using Chelsio adapters.      

from stateless offload adapters (regular NIC) to the full line of TCP/IP Offload Engine (TOE)

adapters.

The software implements RFC 3720, the iSCSI standard of the IETF. The software has been

fully tested for compliance to that RFC and others and it has been exhaustively tested for

interoperability with the major iSCSI vendors.

The software implements most of the iSCSI protocol in software running in kernel mode on the

host with the remaining portion, which consists of the entire fast data path, in hardware when

             

protocol is executed in software.



           

has a distinct performance advantage over the regular NIC. The entire solution, which includes

this software, Chelsio TOE hardware, an appropriate base computer system  including a high

end disk subsystem, has industry leading performance. This can be seen when the entire

solution is compared to others based on other technologies currently available on the market in

terms of throughput and IOPS.

1.1. Features

Chelss iSCSI driver stack supports the iSCSI protocol in the Target mode. From henceforth

 term refers to the iSCSI target.

The Chelsio iSCSI PDU Offload Target software provides the following high level features:

Expanded NIC Support

 Chelsio TCP Offload Engine (TOE) Support

 T4 Based HBAs (T4xx Series cards)

 Non-Chelsio

 Runs on regular NICs

 From wireless through 10 GigE links

Chelsio Terminator ASIC Support

 Offloads iSCSI Fast Data Path with Direct Data Placement (DDP)

 Offloads iSCSI Header and Data Digest Calculations

 Offload Speeds at 1 Gb and 10 Gb

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Chelsio Communications Chelsio T4 Betriebsanweisung Seite 91