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7.4.1
9.2.0
9.1
9.0
8.0.2
8.0.1
8.0
7.4.2
7.4.1
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Understanding Volume Replicator
About Volume Replicator
Feature highlights of Volume Replicator
About Volume Replicator support for IPv6 and dual stack
Basic Volume Replicator terms
Primary and Secondary host
Write-order fidelity
Consistent data versus up-to-date data
Heartbeat protocol
Building blocks of Volume Replicator
Replicated Volume Group
Replicator Log volume
Replication Link - RLINK
Replicated Data Set
Data Change Map
Understanding replication in the Volume Replicator environment
Volume Replicator at the Primary
Volume Replicator at the Secondary
How replication happens in the Volume Replicator environment
Modes of replication
Synchronous mode of replication
Advantage of synchronous mode of replication
Disadvantages of synchronous mode of replication
Understanding data flow in Volume Replicator synchronous mode
Asynchronous mode of replication
Advantages of Asynchronous mode of replication
Disadvantages of Asynchronous mode of replication
Understanding data flow in Volume Replicator asynchronous mode
Synchronous override mode
Understanding data flow in an RDS that contains multiple Secondary hosts
Managing data during failure and recovery
Preventing data loss
Preventing data loss during normal operations
Preventing data loss during a Primary host failure
Maintaining data consistency
Detecting host and connection failures
Securing Volume Replicator
Replication concepts
About using Volume Replicator as a disaster recovery tool
Migrating the Primary role
Taking over the Primary role
Performing a takeover using the fast-failback option
Understanding how Volume Replicator logs writes to the Replicator Log
Sizing the Replicator Log
Determining the size of the Replicator Log
Understanding replication settings for a Secondary
Mode of replication - synchronous attribute
Using the available bandwidth effectively
Bandwidth of the available network connection
Choosing the network protocol
Measures to protect log overflow and replication latency
Replicator Log overflow protection - srlprot attribute
Replicator Log protection when Primary and Secondary are disconnected
Replicator Log protection when Primary and Secondary are connected
Changing between the states of Replicator Log protection
Latency protection - latencyprot attribute
Understanding latency protection
Latency protection when Primary and Secondary are connected
Latency protection when Primary and Secondary are disconnected
Pausing the replication
Pausing the replication from the Primary host
Pausing the replication from the Secondary host
Applications of the pause feature
Understanding checkpoints
Synchronizing the Secondary
Using Automatic Synchronization
Performing intelligent synchronization
Using incremental synchronization after log overflow
Using backup and checkpoint
Understanding Volume Replicator support for FlashSnap
About the snapshot operation
Conditions for creating disk group split friendly snapshots
Forcing the snapshot operation
About the snapback operation
About Synchronized Snapshots
How Volume Replicator creates synchronized snapshots
Understanding Bunker replication
About Bunker replication
Advantages of Bunker replication
How Bunker replication differs from normal replication
Bunker node workflow during normal operations
Using the Bunker node for disaster recovery
Understanding Volume Replicator Support for TCP Multi-Connection
Advantages of TCP Multi-Connection
About Volume Replicator compression
About Volume Replicator memory monitoring and control support
Advantages of memory monitoring
About Volume Replicator Graphs
General functionality constraints for Volume Replicator Graphs in a clustered environment
Setting up replication
About setting up replication
Best practices for setting up replication
Security considerations for Volume Replicator
Configuring the VxSAS Service
Enabling NAT support for Volume Replicator
Setting up replication using the Setup Replicated Data Set wizard
Prerequisites for setting up the RDS
Creating a Replicated Data Set (RDS)
Replication failover considerations with diverse network configurations
Setting up the Bunker RVG for replication
Prerequisites for setting up Bunker RVG
Best practices for creating the Bunker RVG
Adding the Bunker RVG to the RDS
Using the VEA Console for Volume Replication Operations
About performing Volume Replicator operations in the VEA console
Features of VEA console
Launching the VEA console
Managing connections
Connecting to a host
Disconnecting from a host
Reconnecting hosts at startup
Using history to view recent connections
Managing favorites
Adding a host to the favorites
Removing a host from the favorites
Switching connections
Layout of the VEA console
Performing tasks related to views
Selecting objects
Left pane or navigation view (tree view)
Right pane or details view (tabular view)
Status pane
Console view
Tasks view
URL bar
Perspectives
Control Panel
Changing the IPv6 preference through the Control Panel
Menu bar and toolbar
Accessing the Volume Replicator options
Menu bar options
File menu
Tools menu
Actions menu
Toolbar options
Exiting the VEA client
Monitoring replication
About monitoring replication
Interpreting the information in the Volume Replicator views
Viewing all the RDSs on the host
Viewing RDS information
RVG states
Replication status
Viewing information about the Primary RVG
Viewing information about the Secondary RVG
Viewing information about the Primary data volume
Viewing the Replicator Log volume information
Viewing information about the Secondary data volume
Monitoring replication using the VEA console
Displaying the monitor view
Specifying preferences for the monitor view
Interpreting the information in the monitor view
Configuration information
Log usage information
Obtaining replication status information
Obtaining statistical information
Interpreting error information
Checking replication performance using vxrlink stats
Identifying the most up-to-date Secondary
Analyzing Volume Replicator performance
Monitoring alerts to interpret error conditions
Handling Volume Replicator events
Administering Volume Replicator
About administering Volume Replicator
Modifying the configuration
Adding volumes
Prerequisite for adding data volumes to an RDS
Adding a Secondary host
Administering the RVG
Enabling or disabling data access to the RVG data volumes
Expanding the data volumes
Expanding the Replicator Log
Shrinking the data volumes
Before shrinking a data volume
Shrinking a data volume
Adding or removing the DCM logs from the data volumes
Adding or removing the DCM logs for all volumes in an RVG
Resynchronizing the Secondary hosts
Associating or dissociating the Replicator Log volume
Associating the Replicator Log with the RVG
Dissociating the Replicator Log volume on an RVG
Administering replication
Disabling the SwiftSync feature
Starting replication through the VEA console
Stopping replication using the VEA console
Changing replication settings for an RDS
Managing checkpoints
Ending the checkpoint
Pausing replication using Volume Replicator
Notes on pausing the replication
Pausing Secondary from the Primary
Resuming the Secondary host from Primary
Pausing the Secondary host from the Secondary
Converting the Primary to a Secondary
Migrating the Primary role within an RDS
Creating snapshots for the data volumes
Reattaching the snapshots back to the original volumes
Creating synchronized snapshots using the VSS Snapshot wizard
About snapshot naming convention on the Secondary
Creating synchronized snapshot sets
Prerequisites for creating synchronized snapshot sets
Creating schedules for synchronized snapshots
Displaying the status of the scheduled synchronized snapshot
Reattaching synchronized snapshots
Deleting a synchronized snapshot schedule
Recovering the RVG
Restoring the Secondary
Migrating VVR to support IPv6 or dual stack
Administering Bunker replication
Stopping the replication
Pausing Secondary
Changing replication settings for Bunker RVG
Associating or dissociating the Replicator Log
Dissociating the Replicator Log volume on Bunker RVG
Associating the Replicator Log with Bunker RVG
Activate Bunker
Deleting the Bunker Secondary
Performing disaster recovery operation
Using the Bunker node to update the Secondary
Resynchronizing the original Primary when it becomes available
Updating the Secondary from the Bunker
Taking over the Primary role using the fast-failback option
Performing takeover with fast-failback
Prerequisites for takeover with fast-failback
Performing takeover without using fast-failback
General notes on take over operation
Performing takeover in a multiple Bunker setup
Deleting Volume Replicator objects
Removing data volumes
Understanding the remove data volume behavior in different scenarios
Deleting the replicated data set
Deleting the Primary RVG
Deleting the Secondary RVG
Accessing data on Secondary host
Creating a mirror break-off
Creating snapshots
Performing automated system recovery (ASR)
Automated system recovery (ASR) overview
Volume Replicator support for ASR
ASR recovery process
Considerations when restoring a Secondary with a healthy Primary
Microsoft Cluster recovery
Alternative methods to synchronize the Secondary faster
Method 1- Moving the Secondary RVG disk group on to a spare server within the same LAN as the Primary
Method 2- Using snapshots for synchronizing the Secondary data volumes
Renaming Volumes on the Secondary host
Method 3- Using mirrored plexes to synchronize the Secondary
Renaming mirror-breakoff volumes on the Secondary host
Obtaining statistical information through Volume Replicator Graphs
Graph types and usage
Viewing statistical information using Volume Replicator Graph
Viewing online bandwidth usage for an RLINK
Viewing Historic bandwidth usage for an RLINK
Viewing Volume Replicator Non-Paged Pool (NPP) Memory Graph
Saving an Online or Historic bandwidth usage graph
Re-opening a saved CSV graph file
Starting or stopping the Historic Bandwidth Data Collection
Using the command line interface
About using the command line interface
Conventions for command line syntax
Administering the RDS using the vxrds command
Activating the Bunker RVG
Creating and adding a Secondary RVG
Adding an existing volume to the RDS
Adding a Bunker node
Changing the host name or IP
Creating the Primary RVG
Deactivating the Bunker RVG
Deleting the Bunker node
Deleting the Secondary
Deleting the Primary
Dissociating data volumes
Resynchronizing a failed Primary with the new Primary
Converting a Primary to a Secondary
Migrating the Primary to a Secondary
Pausing replication using the vxrds pauserep command
Displaying the RDS
Resizing the data volumes
Before resizing a data volume
Shrinking a data volume
Growing the Replicator Log volume
Resuming replication after pausing
Resynchronizing the Secondary
Setting replication attributes
Starting replication using the vxrds startrep command
Stopping replication using the vxrds stoprep command
Taking over the Primary role using the vxrds takeover command
Performing RLINK Operations using the vxrlink command
Associating a Secondary
Attaching a Secondary
Displaying the list of Secondary checkpoints
Deleting the Secondary checkpoint
Detaching an RLINK
Dissociating an RLINK
Creating new RLINK
Pausing the RLINK
Recovering the RLINK
Restoring the RLINK
Resuming the RLINK
Removing the RLINK
Setting the RLINK attributes
Displaying the network statistics for the RLINK
Output values for vxrlink stats without the -e option
Output values for vxrlink stats with the -e option
Displaying the RLINK status
Identifying the most up-to-date Secondary
Verifying the RLINK
Starting the Historic Bandwidth Data Collection using the CLI
Stopping the Historic Bandwidth Data Collection using the CLI
Administering the RVGs using the vxrvg command
Adding DCM log
Associating the Replicator Log volume to an RVG
Associating data volume with the RVG
Ending checkpoint
Starting the checkpoint
Deleting the RVG checkpoint
Displaying RVG checkpoints
Dissociating volumes from RVG
Dismounting data volumes
Creating new RVG
Converting a Secondary RVG to Primary RVG
Converting a Primary RVG to Secondary RVG
Recovering the RVG
Removing an RVG
Resynchronizing the RVG
Setting RVG attributes
Creating snapshots for data volumes in an RVG
Reattaching the snapshot volumes back to the data volumes in an RVG
Enabling data access (Starting the RVG)
Generating application statistics
Disabling data access (stopping the RVG)
Displaying information using the vxprint command
Displaying a specific RLINK
Interpreting RLINK flag settings
Displaying an individual RVG
Interpreting RVG flag settings
Displaying an individual data volume or Replicator Log
Creating snapshots using the vxsnap command
Preparing volumes for snapshots
Creating Synchronized Snapshots
About snapshot naming convention on the Secondary
Reattaching the Snapshots
Displaying memory statistics using the vxmemstat command
Administering replicated volumes using the vxvol command
Associating a data volume with an RVG
Associating a volume to an RVG as a Replicator Log
Dissociating a volume from an RVG
Displaying and changing replication ports using the vrport command
Displaying or setting ports for replicating data
Displaying or setting ports for heartbeats
Displaying or setting ports for vradmind
Displaying or setting ports for vxrsyncd
Administering the RVG using the vxedit
Deleting the Volume Replicator objects
Setting the attributes
Administering the RVG using the vxassist command
Adding a DCM log
Growing the volumes
Removing a DCM log
Tuning Volume Replicator
Displaying the tunable values
Setting the tunable values
Examples- Using the command line
Sample setup using the command line
Example 1- Setting up replication using the command line interface
Creating the RLINK on the Primary system VVRPRI
Creating the Primary RVG on the Primary system VVRPRI
Creating the RLINK on the Secondary system VVRSEC
Creating the Secondary RVG on Secondary system VVRSEC
Attaching the RLINKs and starting replication on the Secondary
Attaching the RLINKs and starting replication on the Primary
Example 2- Setting up Bunker replication
Example 3- Using Bunker node for disaster recovery
Updating the Secondary from the Bunker
Transferring the Primary role
Restoring the original Primary in a Bunker setup
Migrating the Primary role back to the original Primary
Recovering the original Primary during Bunker replay
Failing back to the original Primary
Restoring the Bunker setup after failback to original Primary
Example 4- Using synchronized snapshots to restore data
Sample setup showing how to restore data using synchronized snapshots
Configuration Details
Preparing the Volumes
Creating snapshot volumes
Using the snapshots to recover the corrupted volumes
Restoring the original Primary
Migrating the Primary role back to the original Primary (failing back to the original Primary)
Configuring Volume Replicator in a VCS environment
About configuring Volume Replicator in a VCS environment
Components of a VCS cluster
Resources
Attributes
Service groups
Application Service group
Replication Service group
Illustrating a highly available Volume Replicator setup
List of agents for Volume Replicator
How the agents work
VvrRvg agent
VvrRvg agent-specific functions, state definitions, and attributes
Sample replicated Service group definition
Dependency graph
Resource dependencies within a replication Service group
Service group dependencies
RVGPrimary agent
Typical multiple Secondary setup
How the agent works in a multiple Secondary setup
How the agent works in a Bunker set up
RVGPrimary agent-specific functions, state definitions, and attributes
Sample RVGPrimary resource definition
Configuring the agents
About configuring the Disaster Recovery Solutions using the DR Wizard
Taking the application group offline on Secondary
Setting up replication using a virtual IP address
Changing the Primary and Secondary IP
Creating RLINKs between each pair of Secondary hosts
Creating the replication service group
Prerequisites for creating the replication service group
Working with existing replication service groups
Adding a new RVG resource to an existing replication Service group
Modifying an existing resource in the replication service group
Configuring Volume Replicator with Hyper-V
Implementing Volume Replicator replication on Hyper-V with Microsoft failover cluster
Prerequisites for setting up Volume Replicator with Hyper-V
Configuring a virtual machine group and resource dependencies
Configuring replication for the virtual machine
Setup 1- Replicating the System as well as Data disks
Setup 2- Replicating the Data disks
Recommendations and workarounds
Advanced settings in Volume Replicator
About using the advanced settings in Volume Replicator
Tuning the Volume Replicator memory parameters
Understanding the concept of a buffer space
Shared memory between Volume Replicator and SFW
Minimum memory required by SFW and Volume Replicator
Size of the memory available on the Secondary
Readback buffer space on the Primary
Modifying the tunable values
Understanding IBC messaging
Features of the IBC messaging
Application of IBC messaging
IBC messaging commands
Command arguments
Registering an application
Unregistering the application
Sending a message
Receiving a message
Unfreezing the Secondary RVG
Displaying registered application names
Registering and sending messages
Registering and receiving messages
Example- Using the IBC messaging facility to take snapshots
Sample setup showing how to take snapshots using the IBC messaging facility
Troubleshooting Volume Replicator
About troubleshooting Volume Replicator
Recommendations and checks
Encrypted files on replicated volumes
Selecting the mode of replication
Volume Replicator issues when Norton AntiVirus scan is performed
Monitor view does not display the RDS information
Preventing the connect problems
Configuration checks for RLINKS
Network, process, and operating system checks
Configuration checks for volume mappings
Troubleshooting Volume Replicator performance
Other information and checks
Recovering from problems in a firewall or NAT setup
Errors when replicating across a firewall
Recovering from problems during replication
Permission denied errors when performing Volume Replicator Operations
Error when configuring the VxSAS Service
Configuring the VxSAS using the Service Control Manager
VEA Service is not started
Connecting to cluster having multiple IP addresses
Error when disabling data access to the RVG, creating Secondary RVG, adding volumes
Error when resizing volumes
Replica link already exists
Unable to perform delete RDS, add volume, delete volume
Removing the Replicator Log volume mirror
Pausing when writes are in progress
Unable to see volume name for associating Replicator Log
Unable to see the volume names for adding volumes to RDS
Adding logs to dissociated volumes
Using two commands in succession
Renaming dynamic disk group while importing
Problems when performing the snapshot operation
Operation time-out errors
The vxrvg stop command displays operation time-out error
Pausing Secondary from Primary displays operation time-out error
Problems when configuring Volume Replicator in a VCS environment
Application Service group does not failover correctly
Problems when setting performance counters
Volume Replicator objects are not displayed
Volume Replicator 7.4.1 Administrator's Guide - Windows - v7.4.1
Services and ports
InfoScale ports and services
Using the vxrsync utility
About using the vxrsync utility
When to use vxrsync
Understanding how the utility works
Layout of the configuration file
Sample configuration file layout
Using the vxrsync utility with the vxrclient component
vxrclient
vxrserver
Example- Using vxrsync for difference-based synchronization
VR Advisor (VRAdvisor)
Introducing Volume Replicator Advisor (VRAdvisor)
Overview of VRAdvisor
How VRAdvisor works
Data collection
Data analysis
What-if analysis
Installing Volume Replicator Advisor (VRAdvisor)
Uninstalling VRAdvisor on Windows
Collecting the sample of data
Collecting sample data using the VRAdvisor Wizard
Collecting the sample data using the diskStats command
Analyzing the sample of data
Understanding the results of the analysis
Viewing the analysis results
Analysis graph
Analysis results
Recalculating the analysis results
Applying different parameters to the existing sample of data
Performing What-if analysis
Recording and viewing the results
Sizing the SRL
Overview
Peak usage constraint
Synchronization period constraint
Secondary backup constraint
Secondary downtime constraint
Additional factors
Example
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Last published :
Jun 12, 2026
This section includes the following topics:
About using the advanced settings in Volume Replicator
Tuning the Volume Replicator memory parameters
Understanding IBC messaging
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About using the advanced settings in Volume Replicator
Tuning the Volume Replicator memory parameters
Understanding IBC messaging
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