Dell PowerVault MD3000i Technical manual

Dell™ PowerVault™

MD3000i Systems

Information Update

信息更新

Mise à jour des informations

Aktuelle Informationen

アップデート情報

정보 갱신본

Actualización de información

Dell™ PowerVault™

MD3000i Systems

Information Update

Notes, Notices, and Cautions

NOTE: A NOTE indicates important information that helps you make better use of

your computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data

and tells you how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury,

or death.

____________________

Information in this document is subject to change without notice.

Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc.

is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and PowerVault are trademarks of Dell Inc.;

Microsoft, Windows, and Windows Server are either trademarks or registered trademarks of Microsoft

Corporation in the United States and/or other countries; SUSE is a registered trademark of Novell,

Inc., in the United States and other countries; Red Hat and Enterprise Linux are registered trademarks

of Red Hat, Inc. in the United States and other countries.

Other trademarks and trade names may be used in this document to refer to either the entities claiming

the marks and names or their products. Dell Inc. disclaims any proprietary interest in trademarks and

trade names other than its own.

July 2008 P/N D606F Rev. A02

Information Update 3

This document provides updated information regarding the

Dell™ PowerVault™ MD3000i Storage Enclosure. The following topics

are included:

• Increasing Bandwidth With Multiple iSCSI Sessions

• Modular Disk Storage Manager

• Supported Link Rates and Auto Negotiation

• Physical Disk Migration

• Stopping and Starting iSCSI Services

• RAID Level Migration Requirements

• Updates to the MD3000i Documentation

Increasing Bandwidth With Multiple iSCSI

Sessions

The Dell PowerVault MD3000i in the duplex configuration supports two

active/active asymmetric redundant controllers. Each controller has two

1 Gbps Ethernet ports that support iSCSI, and the bandwidth of the two

ports on the same controller can be aggregated to provide optimal

performance. A host can be configured to simultaneously use the bandwidth

of both the ports on a controller to access virtual disks owned by the

controller. The multi-path failover driver that Dell provides for the MD3000i

can be used to configure the MD3000i so that all ports will be used for

simultaneous I/O access. If the multi-path driver detects multiple paths to

the same virtual disk through the ports on the same controller, it will load

balance I/O access from the host across all the ports on the controller.

Figure 1 illustrates configuring the initiator to take advantage of the load

balancing capabilities of the multi-path failover driver.

4Information Update

Figure 1. Initiator Configuration

Two sessions with one TCP connection are configured from the host to each

controller (one session per port), for a total of four sessions. The multi-path

failover driver will balance I/O access across the sessions to the ports on the

same controller. In a duplex configuration, with virtual disks on each

controller, creating sessions using each of the iSCSI data ports of both

controllers increases bandwidth and provides load-balancing.

IP Network 1 IP Network 2

iSCSI initiator

network interfaces

host

if1 if2

controller 0

MD3000i

controller 1

P1P0

IP Addresses

Host

If1: IP_Addr_If1

If2: IP_Addr_If2

MD3000i Controller 0

P0: IP_Addr_C0_P0

P1: IP_Addr_C0_P1

MD3000i Controller 1

P0: IP_Addr_C1_P0

P1: IP_Addr_C1_P1

TCP Connections

To MD3000i Controller 0

T01: IP_Addr_If1 / IP_Addr_C0_P0

T02: IP_Addr_If2 / IP_Addr_C1_P1

To MD3000i Controller 1

T11: IP_Addr_If1 / IP_Addr_C1_P0

T12: IP_Addr_If2 / IP_Addr_C1_P1

iSCSI Sessions

To MD3000i Controller 0

Session 00: T01

Session 01: T02

To MD3000i Controller 1

Session 10: T11

Session 11: T12

Information Update 5

Modular Disk Storage Manager

The following updates apply to the Modular Disk Storage Manager (MD

Storage Manager) software:

• Simplified Chinese is not supported when installing or using MD Storage

Manager on SUSE

Linux Enterprise Servers (SLES) systems.

• Japanese is not supported when using the MD Storage Manager graphical

user interface (GUI) on SLES systems.

• When install or running MD Storage Manager on Red Hat

Enterprise

Linux

4 (RHEL 4) V4 running a Chinese OS, set the proper input

manager to

miniChinput

as shown below:

– Select

Applications Menu

→

System Settings

→

Input Method

Switcher

to open the input method switcher, or use the

system-

switch-im command

in a terminal window.

–Under

Advanced Settings

, select

Chinese (P.R. of China)

, or use the

im-switch –z zh_CN –s miniChinput

command in a

terminal window.

NOTE: You must restart X-11 for the miniChinput input manager change to take

effect.

Supported Link Rates and Auto Negotiation

MD3000i iSCSI ports are 1000BASE-TX and require auto-negotiation to

always be present and enabled. The iSCSI ports can operate at 1Gb/sec full

duplex, 100Mb/sec full duplex, or 100Mb/s half duplex (if the other half of

the link is auto-negotiation enabled).

To avoid network performance problems, always run at 1Gb/sec.

NOTE: 10Mb/s link rate is not supported.

Physical Disk Migration

Cold powerup migration of

physical disk

s from an MD3000 duplex

configuration to an MD3000i duplex configuration is supported only when all

physical disk

s are moved from one system to another. No other migrations,

including partial

physical disk

migration and RAID controller module

migration, are supported.

6Information Update

Stopping and Starting iSCSI Services

Should it become necessary to manually stop the iSCSI services in Linux,

certain steps must be followed to maintain parallel processing between the

RAID storage array and the host server. MPP (multi-path driver) is partially

unloaded when the iSCSI services are stopped.

To ensure orderly shutdown of the iSCSI services, take the following actions:

• Stop all I/O.

• Unmount all correlated filesystems.

• Unload all modules in correct order.

Internally, these tasks can be handled by the mppiscsi_umountall script, which:

• Kills all pending I/O on each iSCSI-mounted devices via the

fuser

command

• Unmounts all iSCSI-mounted devices

• Unloads the mpp_Vhba module

• Unloads the iSCSI module

Likewise, to ensure orderly startup of the iSCSI services, these actions must

occur in the following order:

Load the mpp_Vhba module (if not already).

Load the iSCSI modules.

NOTE: Unloading the iSCSI modules will kill all I/O on the iSCSI devices.

RAID Level Migration Requirements

Successful RAID Level Migration (RLM) requires that the appropriate

number of

physical disk

s are present in your disk group. To perform RLM

from a RAID 1 or RAID 10 to an odd-number of physical disks (five or more)

in RAID 5, first add an even number of disks to the RAID 1 or RAID 10,

convert to RAID 5, then add your odd physical disk.

Information Update 7

Updates to the MD3000i Documentation

Hardware Owner’s Manual

The following update applies to the Dell™PowerVault™MD3000i RAID

Enclosure Hardware Owner’s Manual:

Under "Best Practices and Recommendations," the note should read:

NOTE: Use untagged VLANs for your storage needs. VLAN tagging is supported,

but not recommended.

Installation Guide

The following update applies to the Dell™PowerVault™Modular Disk 3000i

Installation Guide:

The Modular Disk Storage Manager Resource CD now features an MD3000i

Configuration Utility, which is a unified graphical user interface (GUI) that

facilitates the configuration of MD3000i storage arrays and host server

initiators. This utility assists users by gathering information about arrays via

discovery mechanisms and auto populating fields with the discovered data.

You can launch the MD3000i Configuration Utility from the Resource CD

by performing the following steps.

Place the Resource CD in the CD drive. On Windows operating

systems:

• If autorun is enabled, Installer will autorun. Select the MD3000i

Configuration Utility option.

• If autorun is not enabled, run

setup.bat

. Select the MD3000i

Configuration Utility option.

On supported Linux operating systems:

• Mount the Resource CD.

• If autorun is enabled, Installer will autorun. Select the MD3000i

Configuration Utility option.

• If autorun is not enabled, run the

autorun

file. Select the

MD3000i Configuration Utility option.

8Information Update

Microsoft iSCSI Initiator 2.07 is available for installation from the

Resource CD. This same executable is available from the Microsoft

Windows support site.

NOTE: You do not need to install the version of the Microsoft iSCSI initiator that is

provided on the resource CD for Windows Server 2008 because a native iSCSI

Initiator is already present.

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