Hitachi Dynamic Link Manager Software Users Guide for AIX

Table Of Contents

Contents

Preface.................................................................................................xiii

Intended audience...................................................................................................xiv

Product version....................................................................................................... xiv

Release notes..........................................................................................................xiv

Document revision level........................................................................................... xiv

Document organization.............................................................................................xv

Related documents...................................................................................................xv

Document conventions.............................................................................................xvi

Conventions for storage capacity values.................................................................... xvi

Accessing product documentation............................................................................ xvii

Getting help........................................................................................................... xvii

Comments.............................................................................................................xviii

1 Overview of HDLM................................................................................1-1

What is HDLM?.......................................................................................................1-2

HDLM Features.......................................................................................................1-2

2 HDLM Functions................................................................................... 2-1

Devices Managed by HDLM......................................................................................2-3

System Configuration.............................................................................................. 2-3

LU Configuration.....................................................................................................2-5

Program Configuration............................................................................................ 2-6

Position of the HDLM Driver and hdisk......................................................................2-7

Distributing a Load Using Load Balancing..................................................................2-8

Paths to which load balancing is applied........................................................... 2-10

When Using the Thunder 9500V Series, or Hitachi AMS/WMS Series..........2-10

When Using Other Than the Thunder 9500V Series and Hitachi AMS/WMS

Series................................................................................................... 2-11

Load Balancing Algorithms...............................................................................2-12

Performing Failovers and Failbacks Using Path Switching......................................... 2-14

Automatic path switching................................................................................ 2-14

Automatic failovers................................................................................2-14

Priority of Switching Destination Paths.................................................... 2-16

Automatic failbacks................................................................................2-18

Manual path switching.....................................................................................2-19

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Hitachi Dynamic Link Manager (for AIX) User Guide