Q-Logic 8200 SERIES, 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

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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

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	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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
Figure		List of Figures	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

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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

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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

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Preface

Starting with Red Hat® Enterprise Linux® (RHEL™) 6.2 and Novell® SUSE® Linux Enterprise Server (SLES®) 11 SP2, the QLogic qla4xxx driver (iSCSI driver for 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.

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.

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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.

Text in 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. For 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.

Text in 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.

Text in 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:

Press CTRL+P.

Press the UP ARROW key.

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Preface

Technical Support

Text in 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.

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.

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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 Corporation
	4601 Dean Lakes Blvd.
	Shakopee, MN 55379 USA
QLogic Web Site	www.qlogic.com
Technical Support Web Site	http://support.qlogic.com
Technical Support E-mail	[e-mail]
Technical Training E-mail	[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.

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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

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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	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	1	Firmware	Firmware is configured in	Firmware is configured in NON
		Operational	AUTO CONNECT	AUTO CONNECT MODE. In
		Mode	MODE. In this mode:	this mode:
			 The firmware reads	 The driver reads the DDB
			the DDB entries from	entries from the predefined
			the predefined area in	area in the Flash.
			the Flash.	 For a Send Target the
			 For a Send Target the	driver initiates a discovery
			firmware initiates dis-	session through the mail-
			covery, discovers the	box command, queries the
			target, and initiates	firmware for discovered tar-
			login to the discov-	gets, and then initiates
			ered target.	login to the targets using
			 The firmware posts an	the mailbox command.
			AEN to the driver,	 The firmware posts an AEN
			identifying each dis-	to the driver to report login
			covered target.	status after login completes.
			 For the DDBs that rep-	 For DDBs which represent
			resent a Normal tar-	a Normal Target, driver initi-
			get, the firmware logs	ates login using mailbox
			into them and posts an	command. Then, the firm-
			AEN to the driver to	ware posts an AEN to the
			report the login status.	driver to report the login
				status after login com-
				pletes.
	2	Target	Persistence is main-	Persistence is maintained by
		Persistence	tained by storing Discov-	storing Discovery Target and
			ery Target and Normal	Normal Target records in the
			Target records on the	local file system using the
			adapter Flash using the	iscsiadm tool.
			QLogic application a.

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

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

	Serial	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	3	Boot Target	During driver load, the	Login to boot targets is trig-	Note: For more
			firmware performs auto	gered by the driver, or the user	details on adapter
			discovery and login to the	space is dependent on the	mode and the
			boot targets based on the	ql4xdisablesysfsboot	ql4xdisables-y
			target information saved	driver command line parame-	sfsboot driver,
			in the Flash, and posts an	ter:	refer to “Configur-
			AEN to inform the driver	 For RHEL 6.2 it is enabled	ing Boot from SAN
			of the targets and their	by default, so that the driver	on RHEL 6.2” on
			login status.	initiates the login.	page 2-19.
				 For SLES 11 SP2 it is dis-
				abled by default, so that
				yast2-iscsi-client
				must be used to perform
				login.
	4	Re-login	Session management or	Re-login is handled either by	Session re-login is
		Handling	re-login is handled by the	iscsiadm and iscsid, or by	also initiated on
			driver.	the driver, depending how the	chip or adapter
				session is initiated:	reset.
				 If iscsiadm created the
				session, session manage-
				ment 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 ses-
				sion and is responsible for
				re-login or session man-
				agement.
	5	Network con-	Adapter ports are config-	Adapter ports are configured
		figuration	ured using the QLogic	using iscsiadm for network
			applicationa.	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.

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

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

	Serial	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	6	How to view	Qlogic applicationa	Use the following command:
		sessions		iscsiadm -m session
		logged in
	7	Target scan-	Login and target scanning	Login and target scanning is
		ning	is done in kernel space as	done by user space as follows:
			follows:	1. When the driver receives
			1. When the driver	an AEN for the DDB indi-
			receives an AEN for	cating that the target is
			the DDB indicating	logged in, it sends an event
			that the target is	to the iscsid (user
			logged in, the driver	space) indicating that the
			publishes the session	session is in the logged-in
			to the iSCSI transport	state.
			layer and unblocks the	2. iscsid then unblocks the
			session.	session and kicks off the
			2. This triggers the SCSI	target/LUN scanning.
			midlayer LUN scan-
			ning to discover all
			LUNs behind the tar-
			get.
	8	Link Down	No change in the behav-	No change in the behavior of
		impact on	ior of session and SCSI	session and SCSI device state
		SCSI Device	device state handling.	handling.
		Handling	The default session	For Open-iSCSI, default
			recovery time-out is equal	recovery time-out is 120 sec-
			to the firmware keep alive	onds. This can be configured
			timeout. The default value	on an individual session basis
			is 30 seconds. This can	dynamically; that is, it does not
			be modified by the driver	require driver unload.
			command line parameter	Session recovery time-out can
			ql4xkeepalive.
				be configured by modifying the
				replacement_timeout
				parameter in the node record.

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

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

	Serial	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	9	Dynamic	The driver handles the	No explicit support to dynami-
		map-	following check condi-	cally discover newly added
		ping/unmap-	tion/sense data:	LUNs on the back-end stor-
		ping of LUNs	UNIT_ATTENTION	age. Requires manual rescan-
		added to the		ning using iscsiadm
			ASC/ASCQ : 0x3F/0x0E
		back-end stor-	to figure out that a new	command line option.
		age	LUN has been added on
			the back-end storage and
			makes an upcall to the
			SCSI midlayer to trigger a
			LUN scan for that particu-
			lar target.
	10	Tearing Down	The session object can	The session object lifecycle is
		Session/Con-	be destroyed using	completely determined by
		nection	QLogic applicationsa	Open-iSCSI. If the node
		objects		record exists, sessions will be
				created by iscsid and will
				remain there unless logout is
				explicitly issued using iscsi-
				adm.
	11	Multisession	The QLogic applicationa	Open-iSCSI also has multiple	Multisession using
		handling	allows you to create mul-	session support—iscsiadm	qla4xxx will be
			tiple sessions using the	allows creating multiple ses-	available from
			duplicate target option.	sions for a single iface or a sin-	RHEL 6.3 and
			This duplicate target is	gle port. The main difference is	above.
			persistent in the Flash	that target records are persis-
				tent in user space as part of
				node records.

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

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

	Serial	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	12	Flash DDBs	Not applicable	The Open-iSCSI driver will	Note: iscsiadm
		with		support existing Flash DDB	is not capable of
		Open-iSCSI		entries in the adapter.	managing the
		model driver		iscsiadm has no control	Flash target
				over these sessions. Session	entries.
				management of Flash DDB	Before migrating to
				entries is done by the driver
					the Open-iSCSI
				itself.
					model, save this
					DDB/target infor-
					mation to node
					records using
					iscsiadm and
					use the QLogic
					applicationa to
					delete Flash
					entries apart from
					boot targets before
					the upgrade. Then,
					upgrade to the
					Open-iSCSI
					model. Boot tar-
					gets are always in
					the Flash in both
					models.

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1–Legacy vs. Open-iSCSI Functional Flows

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

	Serial	Feature	IOCTL-based Driver	Open-iSCSI-based Driver	Remarks
	No.
	13	CHAP	CHAP settings are	With CHAP support in	Note: Before you
			applied using the QLogic	iscsiadm, CHAP entries can	migrate, delete all
			applicationa.	now be added, deleted, and	CHAP information
				listed from the user space.	from Flash using
					the QLogic applica-
					tiona, and then
					update the same
					CHAP information
					in the respective
					node records using
					iscsiadm com-
					mands.
					When migration
					begins, any CHAP
					information in the
					Flash will be hon-
					ored, 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 unidi-
					rectional and bidi-
					rectional CHAP
					only for boot tar-
					gets. In both mod-
					els, CHAP
					information for boot
					targets is always
					stored in Flash.

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

Functional Flows

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

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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)

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1–Legacy vs. Open-iSCSI Functional Flows

Figure 1-3. Open-iSCSI Discovery

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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

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1–Legacy vs. Open-iSCSI Functional Flows

Session Recovery

Figures 1-6 through 1-7 provide functional flow diagrams of the session recovery process for IOCTL and Open-iSCSI.

Figure 1-6. IOCTL Session Recovery

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1–Legacy vs. Open-iSCSI Functional Flows

Figure 1-7. Open-iSCSI Session Recovery

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1–Legacy vs. Open-iSCSI State Transition Diagrams

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.

Figure 1-8. IOCTL State Transition Diagram

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1–Legacy vs. Open-iSCSI State Transition Diagrams

Figure 1-9. Open-iSCSI State Transition Diagram

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