Dell PowerVault MD3260i Series Mode d'emploi

Troubleshooting the

Dell PowerVault MD-Series iSCSI

Storage Array

Configuring the iSCSI Host Ports

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June 2012

Contents

About this Document .....................................................................................................4

iSCSI Communication Between the Storage Array and Host Server...............................................5

How are iSCSI Sessions Established?.................................................................................5

Enabling IPv4 or IPv6...................................................................................................5

Should I Set Up iSCSI Sessions Automatically or Manually?......................................................5

Setting Up iSCSI Automatically: Using the Dell MD Configuration Utility.....................................5

Setting Up iSCSI Manually: Using the MD Storage Manager......................................................6

Troubleshooting the iSCSI Host Ports ...............................................................................9

Default IP Addresses (iSCSI Host and Management Ports).......................................................9

Recognizing Issues Involving the iSCSI Host Port................................................................ 10

Basics: Cabling, Power and Network Switches .................................................................. 10

Troubleshooting Physical Connectivity Problems............................................................... 12

Troubleshooting iSCSI Host Port IP Addressing and Configuration........................................... 15

Other Device Discovery or iSCSI Session Problems ............................................................. 18

Using Mixed IPv4 and IPv6 Configurations..................................................................... 18

Virtual Disk Not On Preferred Path (VNOP)................................................................... 18

Verifying Device Discovery....................................................................................... 18

Basic Best Practices: iSCSI Host Port Setup and Configuration.................................................. 19

About this Document

To understand the scope and organization of this document, refer to the following table.

Topic Description

What does this document

contain? An overview of the iSCSI data protocol between DellPowerVault MD3200i-series and MD3600i-series storage

arrays and host servers

Recommended iSCSI host port setup guidelines

Potential issues that occur when the storage array'siSCSI host ports are incorrectly configured, including

steps on how to resolve

A brief description of iSCSI host port setup and

configuration best practices (including VMware-specific

information)

Other troubleshooting information relating to the MD-series iSCSI storage arrays

What is the intended

audience? Users experiencing problems setting up iSCSI

communication between their storage array and host

server

Anyone wanting to know more about how the storage

array establishes iSCSI sessions

How is information

categorized? This document is divided into three broad sections:

Understanding and/or resolving physical connectivity

issues between the iSCSI storage array and host server

recognizing and resolving iSCSI host port configuration

problems

Solving common iSCSI device discovery errors

For more information See the following:

MD-series user documentation at

support.dell.com/manuals

MD-series video series at www.del.ly/PowerVaultMD

iSCSI Communication Between the Storage Array and Host Server

All MD-series iSCSI storage arrays have either two or four iSCSI host ports per RAID controller module

(see Figures 4 and 5). These host ports are used to establish iSCSI sessions between the storage array

and host server. To be able to write data to the storage array, the host server must be able to establish

a successful iSCSI session with at least one port per RAID controller module.

How are iSCSI Sessions Established?

A basic overview of how an iSCSI session is set up between the iSCSI host ports on your storage array

and the host server is below:

Step 1: The iSCSI initiator on the host server sends a discovery session command to the storage

array.

Step 2: The MD storage array responds with a list of available iSCSI host ports.

Step 3: Depending on how the iSCSI initiator is configured (the iSCSI initiator can be configured to

connect to all storage array ports or a specific set of ports), the host server attempts to log in to

available iSCSI ports on the storage array.

Step 4: A successful log in by the host server to a storage array port establishes an iSCSI session.

Enabling IPv4 or IPv6

IPv4 and IPv6 are both supported protocols on the MD-series iSCSI storage arrays. Whichever one you

use, be aware of the following with either protocol:

It is possible to enable both IPv6 and IPv4 on your host server. However, Dell recommends that

you disable the one you are not using before setting up your storage array. Having both

enabled may cause miscommunication between the storage array and host server.

Make sure that the protocol you choose is enabled on both the storage array and host server.

Mixing protocols (for example, enabling IPv4 on the storage array and IPv6 on the host server)

will cause session interrupts and possible loss of data.

Should I Set Up iSCSI Sessions Automatically or Manually?

NOTE: In most cases, Dell recommends that you set up iSCSI communication between your host

server and storage array automatically using the Dell MD Configuration Utility (MDCU)

supplied on the installation DVD. However, since this document focuses mostly on

troubleshooting problems that occur during iSCSI host port setup, the process of setting up

iSCSI manually using MD Storage Manager is emphasized. For information on using MDCU, see

the Help link in the utility itself.

Setting Up iSCSI Automatically: Using the Dell MD Configuration Utility

Using the Dell MD Configuration Utility is the easiest way to set up iSCSI communication between your

storage array and host server.

You can start MDCU in any of the following ways:

On Windows-based systems:

- During MD Storage Manager installation from the DVD shipped with your storage array, select

the option to automatically start MDCU following reboot

- Once you have installed the management software and utilities from the DVD, choose

Start>Programs>Dell>MD Storage Software>Modular Disk Configuration Utility.

On Linux-based systems:

- Once you have installed the management software and utilities from the DVD, launch MDCU

- Go to /opt/dell/mdstoragesoftware/mdconfigurationutility and run the executable

Whichever way you launch MDCU, the window shown in Figure 1 is displayed.

Figure 1. Dell MD Configuration Utility for iSCSI

Setting Up iSCSI Manually: Using the MD Storage Manager

To manually set up iSCSI communication between your host server and storage array, perform the

following steps:

Launch MD Storage Manager

From the Setup tab, choose Manually Identify Host

Using the MD Storage Manager wizard, enter the host and management information for each iSCSI host

used.

Figure 2. MD Storage Manager Summary View

Figure 3. MD Storage Manager Physical View

Once the storage array is successfully added to MD Storage Manager, all physical and logical

components of your storage array are manageable using the menu-based interface. For more

information on installing and using MD Storage Manager, see the Getting Started Guide that shipped

with your storage array and the Help option from the main window.

Troubleshooting the iSCSI Host Ports

There are two different RAID controller module host port layouts on the MD-series iSCSI storage arrays,

depending on model type:

Figure 4. Four-port MD3200i-series 1GB iSCSI storage array

Figure 5. Two-port MD3600i-series 10Gb iSCSI storage array

Default iSCSI Host and Management Port IP Addresses

Each port on the storage array is assigned a default, factory-set IP address. However, in the case of the

iSCSI host ports, these default addresses may not appear initially since DHCP is not enabled by default

at the factory.

Table 1. Default IP Addresses on MD-series storage array (all models)

Port ID Controller 0 Controller 1 Subnet mask

iSCSI port 0 192.168.130.101 192.168.130.102 255.255.255.0

iSCSI port 1 192.168.131.101 192.168.131.102 255.255.255.0

iSCSI port 2 *192.168.132.101 192.168.132.102 255.255.255.0

iSCSI port 3 *192.168.133.101 192.168.133.102 255.255.255.0

Ethernet

management port 192.168.128.101 192.168.128.102 255.255.255.0

* Port 2 and 3 are available on 1Gb iSCSI MD3200i-series storage arrays only

Recognizing iSCSI Host Port Problems

Problems occurring due to misconfigured or nonfunctional iSCSI host ports on your storage array's RAID

controller modules can appear in a number of different ways. However, typical iSCSI host port issues

may include:

−Status LEDs on iSCSI ports not lit or indicating fault (refer to Table 2 for LED values)

−Unable to ping an iSCSI port from the host server on the same subnet

−Dynamic Host Configuration Protocol (DHCP) is unable to assign an IP address for one or more

of your RAID controller modules

−Duplicate IP addresses appear (either manually set or set incorrectly in factory)

Basics: Cabling, Power and Network Switches

Simple issues, such as an improperly seated iSCSI cable or a defective and/or powered-down hardware

component, are often the root cause of a number of problems. If a physical link error occurs or you are

unable to connect to a storage array in MD Storage Manager, it is always useful to perform a simple,

standard troubleshooting protocol:

1. Verify you have a solid, well-seated connection between the RAID controller module's iSCSI host

port(s) and your host server and/or network switch.

2. If you are using a network switch, verify the following:

- All active link and link status LEDs are lit (an unlit activity LED is not necessarily a

problem)

- The Ethernet switch you are using matches the speed of your RAID controller module

(for example, do not use a 1GB switch on a 10Gb iSCSI storage array)

- Do not connect an Ethernet switch with a speed of less than 1Gb to the storage array

- Your switch speed settings in MD Storage Manager match settings on your host server

(see Using Ethernet Jumbo Frames)

3. Verify that MD-series storage array enclosures and RAID controller modules are powered on and

show the proper LED status configurations. (See Table 2.)

4. Ensure that all cabling and connectors are functional. If uncertain, swap current cables with

known good cables and determine whether the problem resolves.

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