Dynamic Link Manager (for Windows) User Guide

Version: 9.0.x
Audience: anonymous
Part Number: MK-92DLM129-58
Published: 2026-04-28

Overview of HDLM
What is HDLM?
HDLM features
HDLM functions
Devices managed by HDLM
System configuration
System configuration using an FC-SAN
System configuration using an IP-SAN
Setting range of the iSCSI software and iSCSI HBA
LU configuration
Program configuration
Driver levels of the HDLM and MPIO drivers
Distributing a load using load balancing
Paths to which load balancing is applied
When all paths are owner paths
When non-owner paths exist
Load balancing algorithms
Performing failovers and failbacks using path switching
Automatic path switching
Automatic failovers
Automatic failbacks
Manual path switching
Path status transition
The online path statuses
The offline path statuses
Status transitions of a path
Monitoring intermittent errors (functionality when automatic failback is used)
Checking intermittent errors
Setting up intermittent error monitoring
Intermittent error monitoring actions
When an intermittent error occurs
When an intermittent error does not occur
When the conditions for an intermittent error are changed during error monitoring
When failures occur on all paths while monitoring for intermittent errors
When a user changes the intermittent error information
Detecting errors by using path health checking
Dynamic re-configuration
Adding an LU dynamically
Deleting an LU dynamically
Error management
Types of collected logs
Filtering of error information
Collecting error information using the utility for collecting HDLM error information (DLMgetras)
Collecting audit log data
Categories and audit events that HDLM can output to the audit log
Requirements for outputting audit log data
Destination and filtering of audit log data
Audit log data formats
Retry count monitoring function
Checking the retry count monitoring function
Setting up the retry count monitoring function
Operation of the retry count monitoring function
When the path is placed offline by the retry count monitoring function
When the path is not placed offline by the retry count monitoring function
When the retry count monitoring function settings are specified during monitoring by the retry count monitoring function
Cluster support
Creating an HDLM environment
HDLM system requirements
OSs supported by HDLM
Supported OSs
Microsoft MPIO drivers
Web browsers supported by HDLM
JDK
Storage systems supported by HDLM
Supported storage systems
HBAs
When using intermediate volumes managed by Hitachi RapidXchange to exchange data
Cluster software supported by HDLM
Virtual environments supported by HDLM
Memory and disk capacity requirements
Memory requirements
Disk requirements
Number of LUs and paths that are supported in HDLM
Flow for creating an HDLM environment
HDLM installation types
Notes on creating an HDLM environment
Notes on HBAs and HBA drivers
Notes on storage systems
Notes on HDLM versions
Notes on Windows
Notes on related software
Notes on installation
Installing HDLM
Preparations for a new installation of HDLM
Preparations for installing HDLM by performing an unattended installation
How to create an installation-information settings file
Notes on an unattended installation
Performing a new installation of HDLM
Procedure for unattended installation
Procedure for other installation methods
Procedure after the installation finishes
Procedure for installing HDLM and then configuring a cluster environment
Procedure for configuring a cluster environment and then installing HDLM
Upgrade installation or re-installation of HDLM
Checking the path configuration
Setting up HDLM
Checking the current settings
Setting up the HDLM functions
Setting up load balancing
Setting up path health checking
Setting up the automatic failback function
Setting up intermittent error monitoring
Setting up the LU deletion function
Setting the error log collection level
Setting the trace level
Setting the error log file size
Setting the number of error log files
Setting the trace file size
Setting the number of trace files
Setting up audit log data collection
Checking the updated settings
Removing HDLM
Preparations for HDLM removal
Notes on removing HDLM
Removing HDLM
Removal procedures - in a non-cluster environment
Removal procedures - MSCS or VCS environment
Removal procedures - Oracle RAC or Oracle SEHA environment
Clearing the persistent reservation
HDLM operation
Notes on using HDLM
Using a storage management program
Upgrading Windows
Using MSCS
When the number of displayed paths is less than the actual number of paths
When a system event occurs in an MSCS environment
Using Backup Exec and the NetBackup Intelligent Disaster Recovery function
Notes on using HDLM commands, HDLM utilities, and the HDLM GUI
Notes on using Replication Manager
HDLM operations using the HDLM GUI
Notes on using the HDLM GUI
Viewing the GUI Help
Using commands for HDLM operations
Notes on using commands
Viewing path information
Changing the status of paths
Changing the status of paths to Online
Changing the status of paths to Offline(C)
Viewing LU information
Initializing statistical information for paths
Viewing and setting up the operating environment
Viewing the operating environment
Setting up the operating environment
Viewing license information
Updating the license
Viewing HDLM version information
Viewing HDLM component information
Starting and stopping the HDLM manager
Starting the HDLM manager
Stopping the HDLM manager
HDLM resident processes
Reconfiguring the HDLM operating environment
Setting up an added LU and path as an HDLM management-target
Setting up an added LU as an HDLM management-target
Checking an added path
Deleting an LU dynamically
Requirements to delete the LU dynamically
Checking that the LU or path has been dynamically deleted
Recovering a deleted LU or path
Notes on the Windows MPIO function
Troubleshooting
Information collected by the DLMgetras utility for collecting HDLM error information
Checking error information in messages
What to do for a path error
Examining the messages
Obtaining path information
Identifying the error path
Narrowing down the hardware that might have caused the error
Identifying the error location and correcting any hardware errors
Placing the path online
What to do for a program error
Examining the messages
Obtaining program information
What to do for the program error
Contacting your HDLM vendor or maintenance company
What to do for other errors
Command reference
Overview of the HDLM command dlnkmgr
clear (returns the path statistics to the initial value)
Format
To set the path statistics to 0
To display the format of the clear operation
Parameters
To set the path statistics to 0
To display the format of the clear operation
help (displays the operation format)
Format
Parameter
offline (places paths offline)
Format
To place paths offline
To display the format of the offline operation
Parameters
To place paths offline
To display the format of the offline operation
online (places paths online)
Format
To place paths online
To display the format of the online operation
Parameters
To place paths online
To display the format of the online operation
set (sets up the operating environment)
Format
To set up the HDLM operating environment
To display the format of the set operation
Parameters
To set up the HDLM operating environment
To display the format of the set operation
view (displays information)
Format
To display program information
To display path information
To display LU information
To display the format of the view operation
Parameters
Parameters used when displaying program information
Parameters used when displaying path information
Parameters used when displaying LU information
Parameter used when displaying the format of the view operation
delete (deletes a path dynamically)
Format
To delete a path dynamically
To display the format of the delete operation
Parameters
To delete a path dynamically
To display the format of the delete operation
refresh (applies storage system settings to HDLM)
Format
To apply storage system settings to HDLM
To display the format of the refresh operation
Parameters
To apply storage system settings to HDLM
To display the format of the refresh operation
Utility reference
Overview of the utilities
The DLMgetras utility for collecting HDLM error information
Format
When executing the DLMgetras utility from the command prompt
When executing the DLMgetras utility from the Windows Start menu
Parameters
List of collected error information
The dlmpr utility for clearing HDLM persistent reservations
Format
Parameters
Procedure for executing the dlmpr utility in MSCS environments:
Procedure for executing the dlmpr utility in VCS environments:
The dlmprsvkey utility for registering an HDLM persistent reservation key
Format
Parameter
The dlmchkpath utility for checking HDLM paths
Format
Parameters
The dlmhostinfo utility for checking HDLM installation information
Format
Parameters
The utility for displaying HDLM performance information (dlmperfinfo)
Format
Parameters
Displayed performance information
Outputting a CSV file
The installhdlm utility for installing HDLM
Format
Parameters
Contents of an installation-information settings file
About the log file
The removehdlm utility for removing HDLM
Format
Parameters
Messages
Before viewing the list of messages
Format and meaning of message IDs
Terms used in messages and message explanations
KAPL01001 to KAPL02000
KAPL02001 to KAPL03000
KAPL03001 to KAPL04000
KAPL04001 to KAPL05000
KAPL05001 to KAPL06000
KAPL07001 to KAPL08000
KAPL08001 to KAPL09000
KAPL09001 to KAPL10000
KAPL10001 to KAPL11000
KAPL11001 to KAPL12000
KAPL12001 to KAPL13000
KAPL13001 to KAPL14000
KAPL15001 to KAPL16000
Events output to Windows event logs by HDLM
Functional differences between versions of HDLM
Functional differences between version 8.6.2 or later and versions earlier than 8.6.2
Functional differences between version 6.6 or later and versions earlier than 6.6
Functional differences between version 6.2 or later and versions earlier than 6.2
Functional differences between version 6.0.1 or later and versions earlier than 6.0.1
Functional differences between version 6.0 or later and versions earlier than 6.0
Functional differences between version 5.9.4 or later and versions earlier than 5.9.4
Functional differences between version 5.9.1 or later and versions earlier than 5.9.1
Functional differences between versions 5.9 or later and versions earlier than 5.9
Path status transition and automatic path switching
Status transition of paths in the Online status
Automatic switching of paths that have the Online(E), Offline(C), or Offline(E) status
Differences in the LU dynamic removal function
Differences in the drive letters displayed in Windows
Differences in default values
Differences in the load balancing function in an MSCS environment
Acronyms and abbreviations
Acronyms and abbreviations

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