Abnormal CPU Usage on Azure VMs with SQL

[DavidCaub]

Hello,

For a week, we have noticed abnormal CPU usage on Azure VMs that have SQL Server installed.

We observe a link with the Azure SQL backup in the VMs. The CPU load saturates when a backup job is triggered!

The backup process iaaSWLPluginSvc consumes a lot of resources, but especially the LSASS process which saturates the CPU.

The domain controller is affected by this problem; on it, the LSASS process also saturates the CPU and does not go down! even when the job is finished!

Is anyone else experiencing this problem?

If so, have you found a solution?

We have opened a Microsoft ticket but no response at the moment!

[#2]

@DavidCaub 

For VM, better to check any changes recently and endpoint, what kind of backup tools are you using?

[#3]

@Kidd_Ip 

No changes !

There is also a discussion on Learn: https://learn.microsoft.com/en-us/answers/questions/1605321/is-anyone-else-having-problems-with-high...

Another user experiencing the same problem received a response from Microsoft:

Right now, it seems to be an authentication issue between the extension and the SQL server. Our ticket was escalated to the product group, and we're now awaiting their answer.

[#4 · Accepted solution]

Solution in Original Post : https://learn.microsoft.com/en-us/answers/questions/1605321/is-anyone-else-having-problems-with-high...

MS has provided us the following Workaround (seems to work for us by now):

1. go to C:\Program Files\Azure Workload Backup\bin\plugins\SQL and open PluginManifest.json
2. Change the value of AllowCommunicationThroughNamedPipes from true to false
3. Open TaskManager and Stop AzureWLBackupPluginSvc and AzureWLBackupInquirySvc. Restart AzureWLBackupCoordinatorSvc.