Hyper-V replica - EnableWriteOrderPreservationAcrossDisk for SQL VM not working

Question

According to Support policy for hardware virtualization product - SQL Server | Microsoft Learn, Hyper-V replica for a VM running SQL server is a supported scenario as long as you enable EnableWriteOrderPreservationAcrossDisks as described in the article.

When I execute the PowerShell command i get the following output "WARNING: 'EnableWriteOrderPreservationAcrossDisks' is not required for 'Set-VMReplication'". The question is although I get this warning message, is it enabled or not? What should I do to be sure that the setting is enabled, is there anything that I could check? Registry maybe?

The SQL VM is running Windows 2022 standard, SQL 2022 server standard with CU13 and has 4 vhdx, OS, SQL data, SQL logs, Tempdb, the Hyper-V host is Windows 2022 standard, May MS updates installed.

Any ideas or experience with that?

Answer 1

Hi Stefanos Papaefthimiou,

Thank you for posting in Q&A.

You can check the EnableWriteOrderPreservationAcrossDisks property of the replication settings of a VM by running

Get-VMReplication -VMName <VMName> | Select-Object VMName,EnableWriteOrderPreservationAcrossDisks

The value of EnableWriteOrderPreservationAcrossDisks will be True if it's enabled.

Best Regards,

Ian Xue

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Answer 2

Thank you for your answer Ian,

The output of the command you suggested indicates that it's enabled:

VMName EnableWriteOrderPreservationAcrossDisks

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vmname True

It seems that although I get the warning, it enables the value.