HP XP Racks - Manual (Page 3)

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
iii
Hitachi Dynamic Link Manager (for AIX) User Guide