HP XP Racks - Manual (Page 3)

Contents
Preface..................................................................................................xi
Intended audience....................................................................................................xii
Product version........................................................................................................xii
Release notes...........................................................................................................xii
Document revision level............................................................................................xii
Document organization.............................................................................................xii
Referenced documents.............................................................................................xiii
Document conventions.............................................................................................xiv
Convention for storage capacity values......................................................................xiv
Getting help.............................................................................................................xv
Comments...............................................................................................................xv
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
Path status transition......................................................................................2-20
iii
Hitachi Dynamic Link Manager User Guide for AIX®