A VM that Azure Site Recovery helps protect goes into a resynchronization state

Symptoms
A virtual machine (VM) that Microsoft Azure Site Recovery (ASR) helps protect in a Hyper-V to Azure scenario may repeatedly go into a resynchronization state. You cannot manually resynchronize, and you may receive the following error message for the replication health of the VM:



Replication State: Resynchronization required
Replication Mode: Primary
Current Replica Server: Microsoft Azure
Replication Health: Critical
Resynchronization is required for the machine X. Resume replication to start resynchronization.
Successful replication cycles: 0 out of Y (0%). More than 20% of replication cycles have been missed for virtual machine X.

Note
 In the error message, the placeholder X represents the name of the VM, and the placeholder Y represents the number of attempts.

You may also see events logged that resemble the following:

Log Name: MicrosoftAzureRecoveryServices-Replication
Source: MicrosoftAzureRecoveryServices
Event ID: 67
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Description:
Resynchronization for virtual machine 'VMName' was marked corrupted by the service. (Virtual Machine ID 11201f14-2111-4a79-97d3-c312d9bcab00, Data Source ID <Number>, Task ID cbb6cfa2-cbbc-4f54-9c21-3fecbb84fe44)


Log Name: MicrosoftAzureRecoveryServices-Replication
Source: MicrosoftAzureRecoveryServices
Event ID: 32
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Description:
Resynchronization failed for virtual hard disk 'V:\VMName\Virtual Hard Disks\VMName.vhd', of virtual machine VMName'. (Virtual Machine ID 11201f14-2111-4a79-97d3-c312d9bcab00, Data Source ID <Number>, Task ID cbb6cfa2-cbbc-4f54-9c21-3fecbb84fe44)

Cause
This issue can occur if the data disk size of the protected VM is greater than or equal to 1 terabyte (TB). 
Resolution
The maximum disk size that is supported for data disks in Azure is currently 1 TB. To work around this issue, reduce the hard disk to less than 1 TB. For more information, see the following article:
Properties

Article ID: 3094171 - Last Review: 09/22/2015 03:28:00 - Revision: 2.1

Microsoft System Center 2012 R2 Virtual Machine Manager

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