Dynamic Link Manager (for VMware) User Guide

Version: 9.0.x
Audience: anonymous
Part Number: MK-92DLM130-35
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
LU configuration
Program configuration
HDLM driver and NMP positions
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
Correspondence between VMware vSphere and HDLM path statuses
Status transitions of a path
Monitoring intermittent errors
Checking intermittent errors
Setting up intermittent error monitoring
Intermittent error monitoring actions
When a user changes the intermittent error information
Detecting errors by using path health checking
Error management
Types of collected logs
Collecting error information
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
Creating an HDLM environment
HDLM system requirements
Hosts and OSs supported by HDLM
Host OS support
Remote management client OS support
CLI to be used on a remote management client
Storage systems supported by HDLM
Memory and disk capacity requirements
Memory requirements
Disk requirements
Number of LUs and paths that are supported in HDLM
HDLM version for remote management clients and ESXi hosts
Flow for creating an HDLM environment
HDLM installation types
Notes on creating an HDLM environment
Installing HDLM
Performing a new installation of HDLM
New installation on remote management client
Unattended installation on remote management client
New installation on host
Performing an upgrade installation of HDLM
Performing a 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 intermittent error monitoring
Setting up audit log data collection
Checking the updated settings
Removing HDLM
Preparations for HDLM removal
Removing HDLM
Removing HDLM from a host
Removing HDLM from a remote management client
Notes on upgrading the host OS
Collecting HDLM configuration information
Reconfiguring HDLM configuration information
Load balancing
Intermittent Error Monitor
The number of times the same path is used for extended load balancing (sequential I/O)
The number of times the same path is used for extended load balancing (random I/O)
Configuring the path failure suppression function
HDLM operation
HDLM operations using commands
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
HDLM and anti-virus software
Path failure message suppression function
Overview of the path failure message suppression function
Configuring the path failure message suppression function
Checking the path failure message suppression function
Triggers for starting and lifting suppression of path failure messages for each path
Configuring the path failure message suppression information
Format
Parameters
Usage example
Notes
Confirming the information about the path failure message suppression
Format
Parameters
Usage example
Troubleshooting
Collecting error information
Checking error information in messages
What to do for a path error
Examining the messages
Obtain 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 the host operating environment
To set the remote management client operating environment
To display the format of the set operation
Parameters
To set the host operating environment
To set the remote management client operating environment
To display the format of the set operation
view (displays information)
Format
To display program information for a host
To display program information for a remote management client
To display path information
To display LU information
To display the format of the view operation
Parameters (to display program information)
To display program information for hosts
To display program information for a remote management client
To display path information
To display LU information
To display the format of the view 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
Parameters
List of collected error information
The utility for displaying HDLM performance information (dlmperfinfo)
Format
Parameters
Displayed performance information
Outputting a CSV file
The dlmrmcenv utility for configuring HDLM remote management client environments
Format
Parameters
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
KAPL03001 to KAPL04000
KAPL04001 to KAPL05000
KAPL08001 to KAPL09000
KAPL09001 to KAPL10000
KAPL10001 to KAPL11000
KAPL11001 to KAPL12000
KAPL13001 to KAPL14000
KAPL15001 to KAPL16000
KAPL20001 to KAPL21000
KAPL21001 to KAPL22000
Path failure message suppression function (when using the extended esxcli command)
Configuring the path failure message suppression information
Format
Parameters
Recommended parameter settings
Usage example
Notes
Confirming the information about the path failure message suppression
Format
Parameters
Usage example
Acronyms and abbreviations
Acronyms and abbreviations

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