Q-Logic 8200, IS0054604-00 A User Manual

User’s Guide

IOCTL to Open-iSCSI Interface

QLogic 4000 Series iSCSI Adapters and 8200 Series

Converged Network Adapters

IS0054604-00 A

User’s Guide—IOCTL to Open-iSCSI Interface
QLogic 4000 Series iSCSI Adapters and 8200 Series Converged Network Adapters

Information furnished in this manual is believed to be accurate and reliable. However, QLogic Corporation assumes no
responsibility for its use, nor for any infringements of patents or other rights of third parties which may result from its
use. QLogic Corporation reserves the right to change product specifications at any time without notice. Applications
described in this document for any of these products are for illustrative purposes only. QLogic Corporation makes no
representation nor warranty that such applications are suitable for the specified use without further testing or
modification. QLogic Corporation assumes no responsibility for any errors that may appear in this document.

Document Revision History

Revision A, June 19, 2012

Changes Sections Affected

Initial release

ii IS0054604-00 A

Table of Contents

Preface

What is in This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii

Related Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Downloading Firmware and Documentation . . . . . . . . . . . . . . . . . . . . ix

Training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

Knowledge Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

1 Legacy vs. Open-iSCSI

Summary of Major Differences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Functional Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Discovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Target Login. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

Session Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

State Transition Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

2 Boot from SAN

New Parameter: ql4disablesysfsboot . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Boot from SAN Configuration Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Configuring Boot from SAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Boot from SAN Installation on SLES 11 SP2 and RHEL 6.2 . . . . . . . . 2-4

Boot from SAN Installation on SLES 11 SP2. . . . . . . . . . . . . . . . . . . . 2-13

Configuring Boot from SAN on RHEL 6.2 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Installing RHEL 6.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

ql4xdisablesysfsboot Settings and Adapter Boot Mode . . . . . . . . . . . . . . . . 2-33

3 Open-iSCSI User’s Guide

Open-iSCSI Supported Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Discovery, Login, and Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

IS0054604-00 A iii

User’s Guide—IOCTL to Open-iSCSI Interface
QLogic 4000 Series iSCSI Adapters and 8200 Series Converged Network Adapters

Boot Target Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Default Behavior on RHEL 6.2 . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Default Behavior on SLES 11 SP2 . . . . . . . . . . . . . . . . . . . . . . . 3-3

Persistence through Flash and Open-iSCSI Database . . . . . . . . . . . . 3-3

Managing QLogic iSCSI Adapters Using iscsiadm . . . . . . . . . . . . . . . . . . 3-4

iSCSI Configuration Files and Persistent Databases . . . . . . . . . . . . . 3-4

Configuring Targets for qla4xxx Using Open-iSCSI . . . . . . . . . . . . . 3-4

iSCSI Interface Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

iSCSI Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . 3-6

List All ifaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Display iface Configuration Details. . . . . . . . . . . . . . . . . . . . . . . 3-8

Create an iface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8

Update iface Network Parameters . . . . . . . . . . . . . . . . . . . . . . . 3-9

Unidirectional and Bidirectional CHAP settings . . . . . . . . . . . . . 3-11

Target Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Discover Targets using sendtarget . . . . . . . . . . . . . . . . . . . . . . . 3-12

Adding a New discoverydb for sendtarget . . . . . . . . . . . . . . . . . 3-13

Remove sendtarget Node. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Adding and Deleting Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Adding a New Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

List All Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Deleting a Target Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Target Login and Logout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Login to a Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Login to All Targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Login All Sessions with Specified Parameters . . . . . . . . . . . . . . 3-16

Logout from a Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Logout from All Targets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16

Features Not Supported. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Migrating to Open-iSCSI Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17

Linux Open-iSCSI README . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18

4 Known Issues

List of Figures

Figure Page

1-1 Noninteractive Discovery in IOCTL Mode (Legacy) . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1-2 Interactive Discovery in IOCTL Mode (Legacy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

1-3 Open-iSCSI Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

1-4 IOCTL iSCSI Target Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

iv IS0054604-00 A

User’s Guide—IOCTL to Open-iSCSI Interface

QLogic 4000 Series iSCSI Adapters and 8200 Series Converged Network Adapters

1-5 Open-iSCSI Target Login . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

1-6 IOCTL Session Recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

1-7 Open-iSCSI Session Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

1-8 IOCTL State Transition Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

1-9 Open-iSCSI State Transition Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

2-1 Entering Fast!UTIL from the Adapter’s BIOS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

2-2 Selecting the Port to Be Configured. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2-3 Fast!UTIL Options Menu—Selecting Configuration Settings . . . . . . . . . . . . . . . . . . 2-5

2-4 Selecting the Host Adapter Settings Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

2-5 Selecting the Initiator IP Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

2-6 Providing the Initiator IP Address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-7 Configuration Settings Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-8 Selecting Primary Boot Device Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2-9 Providing Target IP Address for Primary Boot Device . . . . . . . . . . . . . . . . . . . . . . . 2-8

2-10 Selecting Alternate Boot Device Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2-11 Providing Target IP Address for Alternate Boot Device . . . . . . . . . . . . . . . . . . . . . . 2-9

2-12 Fast!UTIL Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2-13 Selecting the Primary LUN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

2-14 List of Devices on the Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2-15 Editing Alternate Boot Device Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

2-16 Setting the Boot Mode to Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

2-17 Entering the Boot BIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

2-18 Providing the withiscsi Boot Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

2-19 Installation Welcome Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

2-20 Media Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

2-21 iSCSI Initiator Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2-22 Selecting System Probing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

2-23 Selecting the Installation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

2-24 Setting the Clock and Time Zone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

2-25 Selecting the Server Base Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

2-26 Preparing the Hard Disk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

2-27 Performing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18

2-28 Booting From the Installation Media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2-29 Choosing to Test Media Disk or Skip Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

2-30 Selecting Network Interface for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

2-31 Configuring the IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

2-32 Start of RHEL 6.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

2-33 Selecting the Language for the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

2-34 Selecting the Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

2-35 Selecting Storage Device Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24

2-36 Verifying Paths to the Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25

2-37 Specifying the Host Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26

2-38 Selecting the Time Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27

2-39 Entering the Root Credentials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

2-40 Selecting the Partition Layout Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

IS0054604-00 A v

User’s Guide—IOCTL to Open-iSCSI Interface
QLogic 4000 Series iSCSI Adapters and 8200 Series Converged Network Adapters

2-41 Selecting the Installation Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30

2-42 Installation in Progress. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31

2-43 Installation Completed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32

List of Tables

Table Page

1-1 Differences Between IOCTL and Open-iSCSI Driver Models . . . . . . . . . . . . . . . . . 1-2

2-1 Boot from SAN Configuration Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-2 Configurations and Tools for Checking iSCSI Sessions. . . . . . . . . . . . . . . . . . . . . . 2-33

3-1 Configuration and Persistent Database Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

3-2 Hardware iSCSI Interface Config File Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

vi IS0054604-00 A

Preface

Starting with Red Hat® Enterprise Linux® (RHEL™) 6.2 and Novell® SUSE® Linux
Enterprise Server (SLES
Linux) supports the Open-iSCSI tool iscsiadm. As a result, iscsiadm can now
be used to perform management functions (configuring network settings,
managing iSCSI targets, and so on) on QLogic 4000 Series 1GbE iSCSI Adapters
and 8200 Series 10GbE Converged Network Adapters.

®

What is in This Guide

This document describes the differences between the legacy (IOCTL-based) and
Open-iSCSI management models of the QLogic qla4xxx driver, and provides
brief guidelines for migrating from the legacy to the Open-iSCSI model.

This preface specifies the intended audience, lists related documents, describes
the typographic conventions used in this guide, and provides technical support
and contact information.

The remainder of this user’s guide is organized into the following chapters:

 Section 1 Legacy vs. Open-iSCSI describes the major differences between

the legacy driver which has an IOCTL-based interface for user space
application communications, and the Open-iSCSI model.

 Section 2 Boot from SAN provides information on configuring Boot from

SAN (BFS) when migrating to the Open-iSCSI model.

) 11 SP2, the QLogic qla4xxx driver (iSCSI driver for

 Section 3 Open-iSCSI User’s Guide provides a User’s Guide for

Open-iSCSI.

 Section 4 Known Issues provides a list of currently known issues.

Intended Audience

This document is intended for end users who manage QLogic 4000 Series iSCSI
adapters or 8200 Series Converged Network Adapters on Linux (RHEL 6.2, SLES
11 SP2, or later), using the IOCTL-based management model.

IS0054604-00 A vii

Preface
Related Materials

Related Materials

For additional information, refer to the following:

 Technical Note, 2.10. Kernel

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.2_T
echnical_Notes/kernel_issues.html

 Release Notes for SUSE Linux Enterprise Server 11 Service Pack 2

http://www.novell.com/linux/releasenotes/i386/SUSE-SLES/11-SP2/

 Linux Open-iSCSI README

http://www.open-iscsi.org/docs/README

Documentation Conventions

This guide uses the following documentation conventions:

 NOTE provides additional information.

 Tex t i n blue font indicates a hyperlink (jump) to a figure, table, or section in

this guide, and links to Web sites are shown in underlined blue
example:

 Table 9-2 lists problems related to the user interface and remote agent.

 See “Installation Checklist” on page 3-6.

 For more information, visit www.qlogic.com

 Tex t i n bold font indicates user interface elements such as a menu items,

buttons, check boxes, or column headings. For example:

 Click the Start button, point to Programs, point to Accessories, and

then click Command Prompt.

 Under Notification Options, select the Warning Alarms check box.

 Tex t i n Courier font indicates a file name, directory path, or command line

text. For example:

 To return to the root directory from anywhere in the file structure:

Type

cd /root and press ENTER.

 Enter the following command: sh ./install.bin

 Key names and key strokes are indicated with UPPERCASE:

.

. For

 Press CTRL+P.

 Press the UP ARROW key.

viii IS0054604-00 A

 Tex t i n italics indicates terms, emphasis, variables, or document titles:

 For a complete listing of license agreements, refer to the QLogic

Software End User License Agreement.

 What are shortcut keys?

 To enter the date type mm/dd/yyyy (where mm is the month, dd is the

day, and yyyy is the year).

 Topic titles between quotation marks identify related topics either within this

manual or in the online help, which is also referred to as the help system
throughout this document.

Technical Support

Customers should contact their authorized maintenance provider for technical
support of their QLogic products. QLogic-direct customers may contact QLogic
Technical Support; others will be redirected to their authorized maintenance
provider. Visit the QLogic support Web site listed in Contact Information for the
latest firmware and software updates.

Preface

Technical Support

For details about available service plans, or for information about renewing and
extending your service, visit the Service Program web page at

http://www.qlogic.com/services

.

Downloading Firmware and Documentation

To download firmware and documentation:

1. Go to the QLogic Downloads and Documentation page:

http://driverdownloads.qlogic.com

2. Under QLogic Products, type the QLogic model name in the search box.

Alternatively, you can click Guided Search to obtain assistance in locating
the firmware and documentation to download.

3. In the search results list, locate and select the firmware and documentation,

for your product.

4. View the product details Web page to ensure that you have the correct

firmware and documentation.

Click the Read Me and Release Notes icons under Support Files for
additional information.

5. Click Download Now.

6. Save the file to your computer.

.

7. If you have downloaded firmware, follow the installation instructions in the

Readme file.

IS0054604-00 A ix

Preface
Technical Support

Training

QLogic Global Training maintains a Web site at www.qlogictraining.com offering
online and instructor-led training for all QLogic products. In addition, sales and
technical professionals may obtain Associate and Specialist-level certifications to
qualify for additional benefits from QLogic.

Contact Information

QLogic Technical Support for products under warranty is available during local
standard working hours excluding QLogic Observed Holidays. For customers with
extended service, consult your plan for available hours. For Support phone
numbers, see the Contact Support link at support.qlogic.com

.

Support Headquarters

QLogic Web Site

Technical Support Web Site

Technical Support E-mail

Technical Training E-mail

Knowledge Database

The QLogic knowledge database is an extensive collection of QLogic product
information that you can search for specific solutions. We are constantly adding to
the collection of information in our database to provide answers to your most
urgent questions. Access the database from the QLogic Support Center:

http://support.qlogic.com.

QLogic Corporation
4601 Dean Lakes Blvd.
Shakopee, MN 55379 USA

www.qlogic.com

http://support.qlogic.com

[e-mail]

[e-mail]

x IS0054604-00 A

1 Legacy vs. Open-iSCSI

This section describes the major differences between the legacy driver which has
an IOCTL-based interface for user space application communications, and the
Open-iSCSI model.

This section includes the following topics:

 “Summary of Major Differences” on page 1-2
 “Functional Flows” on page 1-7
 “State Transition Diagrams” on page 1-13

IS0054604-00 A 1-1

1–Legacy vs. Open-iSCSI
Summary of Major Differences

Summary of Major Differences

Table 1-1 summarizes the major differences between the legacy IOCTL-based

and Open-iSCSI models.

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models

Serial

No.

1 Firmware

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

Operational
Mode

Firmware is configured in
AUTO CONNECT
MODE. In this mode:

 The firmware reads

the DDB entries from

the predefined area in

the Flash.

 For a Send Target the

firmware initiates dis-

covery, discovers the

target, and initiates

login to the discov-

ered target.

 The firmware posts an

AEN to the driver,

identifying each dis-

covered target.

 For the DDBs that rep-

resent a Normal tar-

get, the firmware logs

into them and posts an

AEN to the driver to

report the login status.

Firmware is configured in NON
AUTO CONNECT MODE. In
this mode:

 The driver reads the DDB

entries from the predefined
area in the Flash.

 For a Send Target the

driver initiates a discovery
session through the mail-
box command, queries the
firmware for discovered tar­gets, and then initiates
login to the targets using
the mailbox command.



The firmware posts an AEN
to the driver to report login
status after login completes.

 For DDBs which represent

a Normal Target, driver initi­ates login using mailbox
command. Then, the firm­ware posts an AEN to the
driver to report the login
status after login com­pletes.

2Target

Persistence

1-2 IS0054604-00 A

Persistence is main­tained by storing Discov­ery Target and Normal
Target records on the
adapter Flash using the
QLogic application

a

.

Persistence is maintained by
storing Discovery Target and
Normal Target records in the
local file system using the
iscsiadm tool.

1–Legacy vs. Open-iSCSI

Summary of Major Differences

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models (Continued)

Serial

No.

3 Boot Target During driver load, the

4 Re-login

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

firmware performs auto
discovery and login to the
boot targets based on the
target information saved
in the Flash, and posts an
AEN to inform the driver
of the targets and their
login status.

Session management or

Handling

re-login is handled by the
driver.

Login to boot targets is trig­gered by the driver, or the user
space is dependent on the

ql4xdisablesysfsboot

driver command line parame­ter:

 For RHEL 6.2 it is enabled

by default, so that the driver
initiates the login.

 For SLES 11 SP2 it is dis-

abled by default, so that
yast2-iscsi-client
must be used to perform
login.

Re-login is handled either by
iscsiadm and iscsid, or by
the driver, depending how the
session is initiated:

 If iscsiadm created the

session, session manage­ment is handled using
iscsid (in other words,
handled by the user space).

 For the target record which

is persistent in the Flash,
the driver initiates the ses­sion and is responsible for
re-login or session man­agement.

Note: For more
details on adapter
mode and the

ql4xdisables-y
sfsboot driver,

refer to “Configur-

ing Boot from SAN
on RHEL 6.2” on
page 2-19.

Session re-login is
also initiated on
chip or adapter
reset.

5 Network con-

figuration

IS0054604-00 A 1-3

Adapter ports are config­ured using the QLogic
application

a

.

Adapter ports are configured
using iscsiadm for network
configuration. By default,
iscsiadm creates an iface
for each QLogic adapter port.
The iface name is of the form

qla4xxx.00:0e:1e:04:8b:2e

. You can change or update
the network setting for the port
using various iface parameters
and iface operations.

1–Legacy vs. Open-iSCSI
Summary of Major Differences

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models (Continued)

Serial

No.

6 How to view

7 Target scan-

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

sessions
logged in

ning

Qlogic application

Login and target scanning
is done in kernel space as
follows:

1. When the driver
receives an AEN for
the DDB indicating
that the target is
logged in, the driver
publishes the session
to the iSCSI transport
layer and unblocks the
session.

2. This triggers the SCSI
midlayer LUN scan­ning to discover all
LUNs behind the tar­get.

a

Use the following command:

iscsiadm -m session

Login and target scanning is
done by user space as follows:

1. When the driver receives
an AEN for the DDB indi­cating that the target is
logged in, it sends an event
to the iscsid (user
space) indicating that the
session is in the logged-in
state.

2. iscsid then unblocks the
session and kicks off the
target/LUN scanning.

8 Link Down

impact on
SCSI Device
Handling

No change in the behav­ior of session and SCSI
device state handling.

The default session
recovery time-out is equal
to the firmware keep alive
timeout. The default value
is 30 seconds. This can
be modified by the driver
command line parameter
ql4xkeepalive.

No change in the behavior of
session and SCSI device state
handling.

For Open-iSCSI, default
recovery time-out is 120 sec­onds. This can be configured
on an individual session basis
dynamically; that is, it does not
require driver unload.

Session recovery time-out can
be configured by modifying the
replacement_timeout
parameter in the node record.

1-4 IS0054604-00 A

1–Legacy vs. Open-iSCSI

Summary of Major Differences

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models (Continued)

Serial

No.

9 Dynamic

10 Tearing Down

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

map­ping/unmap­ping of LUNs
added to the
back-end stor­age

Session/Con­nection
objects

The driver handles the
following check condi­tion/sense data:

UNIT_ATTENTION
ASC/ASCQ : 0x3F/0x0E

to figure out that a new
LUN has been added on
the back-end storage and
makes an upcall to the
SCSI midlayer to trigger a
LUN scan for that particu­lar target.

The session object can
be destroyed using
QLogic applications

a

No explicit support to dynami­cally discover newly added
LUNs on the back-end stor­age. Requires manual rescan­ning using iscsiadm
command line option.

The session object lifecycle is
completely determined by
Open-iSCSI. If the node
record exists, sessions will be
created by iscsid and will
remain there unless logout is
explicitly issued using iscsi-
adm.

11 Multisession

handling

The QLogic applicationa
allows you to create mul­tiple sessions using the
duplicate target option.
This duplicate target is
persistent in the Flash

Open-iSCSI also has multiple
session support—iscsiadm
allows creating multiple ses­sions for a single iface or a sin­gle port. The main difference is
that target records are persis­tent in user space as part of
node records.

Multisession using

qla4xxx will be

available from
RHEL 6.3 and
above.

IS0054604-00 A 1-5

1–Legacy vs. Open-iSCSI
Summary of Major Differences

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models (Continued)

Serial

No.

12 Flash DDBs

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

with
Open-iSCSI
model driver

Not applicable The Open-iSCSI driver will

support existing Flash DDB
entries in the adapter.
iscsiadm has no control
over these sessions. Session
management of Flash DDB
entries is done by the driver
itself.

Note: iscsiadm
is not capable of
managing the
Flash target
entries.

Before migrating to
the Open-iSCSI
model, save this
DDB/target infor­mation to node
records using
iscsiadm and
use the QLogic
application
delete Flash
entries apart from
boot targets before
the upgrade. Then,
upgrade to the
Open-iSCSI
model. Boot tar­gets are always in
the Flash in both
models.

a

to

1-6 IS0054604-00 A

1–Legacy vs. Open-iSCSI

Functional Flows

Table 1-1. Differences Between IOCTL and Open-iSCSI Driver Models (Continued)

Serial

No.

13 CHAP CHAP settings are

a

The QLogic management applications are iscli (SANsurfer® iSCSI CLI) and qaucli (QConvergeConsole® CLI).

Feature IOCTL-based Driver Open-iSCSI-based Driver Remarks

applied using the QLogic
application

a

.

With CHAP support in
iscsiadm, CHAP entries can
now be added, deleted, and
listed from the user space.

Note: Before you
migrate, delete all
CHAP information
from Flash using
the QLogic applica-

a

tion

, and then
update the same
CHAP information
in the respective
node records using
iscsiadm com­mands.

When migration
begins, any CHAP
information in the
Flash will be hon­ored, but it must be
updated in the
node records using
iscsiadm.

Open-iSCSI CHAP
management is not
supported in RHEL

6.2 and SLES 11
SP2.

CTRL+Q options
let you set unidi­rectional and bidi­rectional CHAP
only for boot tar­gets. In both mod­els, CHAP
information for boot
targets is always
stored in Flash.

Functional Flows

This section provides functional flow diagrams for discovery, target login, and
session recovery.

IS0054604-00 A 1-7

1–Legacy vs. Open-iSCSI
Functional Flows

Discovery

Figures 1-1 through 1-3 provide functional flow diagrams of the discovery process

for IOCTL and Open-iSCSI.

Figure 1-1. Noninteractive Discovery in IOCTL Mode (Legacy)

Figure 1-2. Interactive Discovery in IOCTL Mode (Legacy)

1-8 IS0054604-00 A

1–Legacy vs. Open-iSCSI

Functional Flows

Figure 1-3. Open-iSCSI Discovery

IS0054604-00 A 1-9

1–Legacy vs. Open-iSCSI
Functional Flows

Target Login

Figures 1-4 through 1-5 provide functional flow diagrams of the target login

process for IOCTL and Open-iSCSI.

Figure 1-4. IOCTL iSCSI Target Login

Figure 1-5. Open-iSCSI Target Login

1-10 IS0054604-00 A

Session Recovery

Figures 1-6 through 1-7 provide functional flow diagrams of the session recovery

process for IOCTL and Open-iSCSI.

1–Legacy vs. Open-iSCSI

Functional Flows

Figure 1-6. IOCTL Session Recovery

IS0054604-00 A 1-11

1–Legacy vs. Open-iSCSI
Functional Flows

Figure 1-7. Open-iSCSI Session Recovery

1-12 IS0054604-00 A

State Transition Diagrams

Figures 1-8 through 1-9 provide state transition diagrams for IOCTL and

Open-iSCSI. These diagrams illustrate the management of the session/target life
cycle.

1–Legacy vs. Open-iSCSI
State Transition Diagrams

Figure 1-8. IOCTL State Transition Diagram

IS0054604-00 A 1-13

1–Legacy vs. Open-iSCSI
State Transition Diagrams

Figure 1-9. Open-iSCSI State Transition Diagram

1-14 IS0054604-00 A