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Troubleshoot replication issues for VMware VMs and physical servers

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This article describes some common issues and specific errors you might encounter when you replicate on-premises VMware VMs and physical servers to Azure using Site Recovery.

Step 1: Monitor process server health

Site Recovery uses the process server to receive and optimize replicated data, and send it to Azure.

We recommend that you monitor the health of process servers in the portal to ensure that they are connected and working properly, and that replication is progressing for the source machines that are associated with the process server.

Step 2: Troubleshoot connectivity and replication issues

Connectivity issues between the source server and the process server or between the process server and Azure often cause initial and ongoing replication failures.

To solve these issues, troubleshoot connectivity and replication.

Step 3: Troubleshoot source machines that aren't available for replication

When you try to select the source machine to enable replication by using Site Recovery, the machine might not be available for one of the following reasons:

  • Two virtual machines with the same instance UUID: If two virtual machines under the vCenter have the same instance UUID, the first virtual machine discovered by the configuration server is displayed in the Azure portal. To resolve this issue, ensure that no two virtual machines have the same instance UUID. This scenario is commonly seen in instances where a backup VM becomes active and is logged into our discovery records. Refer to Azure Site Recovery VMware-to-Azure: How to clean up duplicate or stale entries to resolve.
  • Incorrect vCenter user credentials: Ensure that you added the correct vCenter credentials when you set up the configuration server by using the OVF template or unified setup. To verify the credentials that you added during setup, see Modify credentials for automatic discovery.
  • vCenter insufficient privileges: If the permissions provided to access vCenter don't have the required permissions, failure to discover virtual machines might occur. Ensure that the permissions described in Prepare an account for automatic discovery are added to the vCenter user account.
  • Azure Site Recovery management servers: If the virtual machine is used as a management server under one or more of the following roles - Configuration server /scale-out process server / Master target server, then you won't be able to choose the virtual machine from the portal. Management servers cannot be replicated.
  • Already protected/failed over through Azure Site Recovery services: If the virtual machine is already protected or failed over through Site Recovery, the virtual machine isn't available to select for protection in the portal. Ensure that the virtual machine you're looking for in the portal isn't already protected by any other user or under a different subscription.
  • vCenter not connected: Check if vCenter is in a connected state. To verify, go to Recovery Services vault > Site Recovery Infrastructure > Configuration Servers > Click on respective configuration server > a blade opens on your right with details of associated servers. Check if vCenter is connected. If it's in a "Not Connected" state, resolve the issue, and then refresh the configuration server on the portal. After this, virtual machine isn't listed on the portal.
  • ESXi powered off: If the ESXi host under which the virtual machine resides is in a powered-off state, then the virtual machine isn't listed or isn't selectable on the Azure portal. Power on the ESXi host, and refresh the configuration server on the portal. After this, virtual machine is listed on the portal.
  • Pending reboot: If there is a pending reboot on the virtual machine, then you won't be able to select the machine on the Azure portal. Ensure to complete the pending reboot activities and refresh the configuration server. After this, virtual machine is listed on the portal.
  • IP not found or Machine does not have an IP address: If the virtual machine doesn't have a valid IP address associated with it, then you are not able to select the machine on the Azure portal. Ensure to assign a valid IP address to the virtual machine, and refresh the configuration server. It could also be caused if the machine does not have a valid IP address associated with one of its NICs. Either assign a valid IP address to all NICs or remove the NIC that's missing the IP. After this, the virtual machine is listed on the portal.

Troubleshoot protected virtual machines greyed out in the portal

Virtual machines that are replicated under Site Recovery aren't available in the Azure portal if there are duplicate entries in the system. Learn more about deleting stale entries and resolving the issue.

Another reason could be that the machine was cloned. When machines move between a hypervisor and if BIOS ID changes, then the mobility agent blocks the replication. Replication of cloned machines isn't supported by Site Recovery.

No crash-consistent recovery point available for the VM in the last 'XXX' minutes

Following is a list of some of the most common issues:

Initial replication issues [error 78169]

Over and above ensuring that there are no connectivity, bandwidth, or time sync-related issues, ensure that:

  • No anti-virus software is blocking Azure Site Recovery. Learn more on folder exclusions required for Azure Site Recovery.

Source machines with high churn [error 78188]

Possible Causes:

  • The data change rate (write bytes/sec) on the listed disks of the virtual machine is more than the Azure Site Recovery supported limits for the replication target storage account type.
  • There is a sudden spike in the churn rate due to which a high amount of data is pending upload.

To resolve the issue:

  • Ensure that the target storage account type (Standard or Premium) is provisioned as per the churn rate requirement at the source.

  • If you are already replicating to a Premium managed disk (asrseeddisk type), ensure that the size of the disk supports the observed churn rate as per Site Recovery limits. You can increase the size of the asrseeddisk if necessary. Follow these steps:

    • Navigate to the Disks blade of the impacted replicated machine and copy the replica disk name
    • Navigate to this replica managed disk
    • You may see a banner on the Overview blade saying that a SAS URL has been generated. Click on this banner and cancel the export. Ignore this step if you do not see the banner.
    • As soon as the SAS URL is revoked, go to the Configuration blade of the Managed Disk and increase the size so that Azure Site Recovery supports the observed churn rate on the source disk.

  • If the observed churn is temporary, wait for a few hours for the pending data upload to catch up and create recovery points.

  • If the disk contains non-critical data like temporary logs, test data, etc. consider moving this data elsewhere or completely exclude this disk from replication

  • If the problem continues to persist, use the Site Recovery deployment planner to help plan replication.

Source machines with no heartbeat [error 78174]

This happens when Azure Site Recovery Mobility agent on the Source Machine they're communicating with the Configuration Server (CS).

To resolve the issue, use the following steps to verify the network connectivity from the source VM to the Config Server:

  1. Verify that the Source Machine is running.

  2. Sign in to the Source Machine using an account that has administrator privileges.

  3. Verify that the following services are running and if not restart the services:

    • Svagents (InMage Scout VX Agent)
    • InMage Scout Application Service

  4. On the Source Machine, examine the logs at the location for error details:

    C:\Program Files (X86)\Microsoft Azure Site Recovery\agent\svagents*.log

Process server with no heartbeat [error 806]

In case there's no heartbeat from the Process Server, check that:

  1. Process Server VM is up and running

  2. Check the following logs on the Process Server for error details:

    C:\ProgramData\ASR\home\svsystems\eventmanager*.log
    and
    C:\ProgramData\ASR\home\svsystems\monitor_protection*.log

Master target server with no heartbeat [error 78022]

This happens when Azure Site Recovery Mobility agent on the Master Target isn't communicating with the Configuration Server.

To resolve the issue, use the following steps to verify the service status:

  1. Verify that the Master Target VM is running.

  2. Sign in to the Master Target VM using an account that has administrator privileges.

    • Verify that the svagents service is running. If it's running, restart the service

    • Check the logs at the location for error details:

      C:\Program Files (X86)\Microsoft Azure Site Recovery\agent\svagents*.log

  3. To register the master target with the configuration server, navigate to folder %PROGRAMDATA%\ASR\Agent, and run the following on command prompt:

    cmd
cdpcli.exe --registermt

net stop obengine

net start obengine

exit

Protection couldn't be successfully enabled for the virtual machine [error 78253]

This error may occur if a replication policy has not been associated with the configuration server properly. It could also occur if the policy associated with the configuration server isn't valid.

To confirm the cause of this error, navigate to the recovery vault > manage Site Recovery infrastructure, then view the replication policies for VMware and physical machines to check the status of the configured policies.

To resolve the issue, you can associate the policy with the configuration server in use or create a new replication policy and associate it. If the policy is invalid, you can disassociate and delete it.

Error ID 78144 - No app-consistent recovery point available for the VM in the last 'XXX' minutes

Enhancements have been made in mobility agent 9.23 & 9.27 versions to handle VSS installation failure behaviors. Ensure that you're on the latest versions for best guidance on troubleshooting VSS failures.

Some of the most common issues are listed:

Cause 1: Known issue in SQL server 2008/2008 R2

How to fix: There is a known issue with SQL server 2008/2008 R2. Please refer this KB article Azure Site Recovery Agent or other non-component VSS backup fails for a server hosting SQL Server 2008 R2

Cause 2: Azure Site Recovery jobs fail on servers hosting any version of SQL Server instances with AUTO_CLOSE DBs

How to fix: Refer to Kb article

How to fix : Refer KB article

Cause 3: Known issue in SQL Server 2016 and 2017

How to fix: Refer to Kb article

Cause 4: App-Consistency not enabled on Linux servers

How to fix: Azure Site Recovery for Linux Operation System supports application custom scripts for app-consistency. The custom script with pre and post options will be used by the Azure Site Recovery Mobility Agent for app-consistency. Here are the steps to enable it.

To troubleshoot further, Check the files on the source machine to get the exact error code for failure:

C:\Program Files (x86)\Microsoft Azure Site Recovery\agent\Application Data\ApplicationPolicyLogs\vacp.log

How to locate the errors in the file? Search for the string "vacpError" by opening the vacp.log file in an editor

Ex: vacpError:220#Following disks are in FilteringStopped state [\\.\PHYSICALDRIVE1=5, ]#220|^|224#FAILED: CheckWriterStatus().#2147754994|^|226#FAILED to revoke tags.FAILED: CheckWriterStatus().#2147754994|^|

In the preceding example 2147754994 is the error code that tells you about the failure as shown:

VSS writer is not installed - Error 2147221164

How to fix: To generate an application consistency tag, Azure Site Recovery uses Microsoft Volume Shadow copy Service (VSS). It installs a VSS Provider for its operation to take app consistency snapshots. This VSS Provider is installed as a service. In case the VSS Provider service isn't installed, the application consistency snapshot creation fails with the error ID 0x80040154 "Class not registered".

Refer article for VSS writer installation troubleshooting

VSS writer is disabled - Error 2147943458

How to fix: To generate an application consistency tag, Azure Site Recovery uses Microsoft Volume Shadow copy Service (VSS). It installs a VSS Provider for its operation to take app consistency snapshots. This VSS Provider is installed as a service. In case the VSS Provider service is disabled, the application consistency snapshot creation fails with the error ID "The specified service is disabled and cannot be started(0x80070422)".

  • If VSS is disabled,
    • Verify that the startup type of the VSS Provider service is set to Automatic.
    • Restart the following services:
      • VSS service
      • Azure Site Recovery VSS Provider
      • VDS service

VSS PROVIDER NOT_REGISTERED - Error 2147754756

How to fix: To generate an application consistency tag, Azure Site Recovery uses Microsoft Volume Shadow copy Service (VSS). Check if the Azure Site Recovery VSS Provider service is installed or not.

  • Retry the Provider installation using the following commands:
  • Uninstall existing provider: C:\Program Files (x86)\Microsoft Azure Site Recovery\agent\InMageVSSProvider_Uninstall.cmd
  • Reinstall: C:\Program Files (x86)\Microsoft Azure Site Recovery\agent\InMageVSSProvider_Install.cmd

Verify that the startup type of the VSS Provider service is set to Automatic. - Restart the following services: - VSS service - Azure Site Recovery VSS Provider - VDS service

Error ID 95001 - Insufficient permissions found

This error occurs when trying to enable replication and the application folders don't have enough permissions.

How to fix: To resolve this issue, make sure the IUSR user has the owner role for all the following folders -

  • C\ProgramData\Microsoft Azure Site Recovery\private
  • The installation directory. For example, if the installation directory is F drive, then provide the correct permissions to:
    • F:\Program Files (x86)\Microsoft Azure Site Recovery\home\svsystems
  • The \pushinstallsvc folder in the installation directory. For example, if the installation directory is F drive, provide the correct permissions to -
    • F:\Program Files (x86)\Microsoft Azure Site Recovery\home\svsystems\pushinstallsvc
  • The \etc folder in the installation directory. For example, if the installation directory is F drive, provide the correct permissions to -
    • F:\Program Files (x86)\Microsoft Azure Site Recovery\home\svsystems\etc
  • C:\Temp
  • C:\thirdparty\php5nts
  • All the items under the following path -
    • C:\thirdparty\rrdtool-1.2.15-win32-perl58\rrdtool\Release*

Troubleshoot and handle time changes on replicated servers

This error occurs when the source machine's time moves forward and then moves back in a short time, to correct the change. You may not notice the change as the time is corrected quickly.

How to fix: To resolve this issue, wait until the system time crosses the skewed future time. Another option is to disable and enable replication once again, which is only feasible for forward replication (data replicated from on-premises to Azure) and isn't applicable for reverse replication (data replicated from Azure to on-premises).

Next steps

If you need more help, post your question on the Microsoft Q&A question page for Azure Site Recovery. We have an active community, and one of our engineers can assist you.