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Andrea-5818 asked joyceshen-MSFT commented

reboot server with witness shared folder

Hi guys, i have this question,

I have a server, a physical domain controller, with 2 shared folder for SQL and DAG witness. So i need to reboot to complete veeam agent installation. On my environment i have 3 domain controller.

Because is the first time that i need to reboot this server outside maintenance windows, can i reboot without causing any problems to SQL and exchange DAG? i think yes becasue the cluster nodes is all up and they don't need the witness, but I have never done it and I would like some advice before.

thanks

cheers

Andrea

sql-server-generaloffice-exchange-server-administrationwindows-server-clustering
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hi, thank for reply.

is the same for SQL always on availabitity cluster?

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Hi @Andrea-5818

According to my research to the introduction of Windows Failover Cluster Quorum Modes in SQL Server Always On Availability Groups, it should be similar as well. However, it's better to confirm this with a professional sql engineer to avoid any risk, thanks for your understanding!
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AndyDavid answered

Correct, you can boot the File Share Witness anytime as long as the cluster is healthy.

For Exchange, Check before you reboot it by running

 Test-ReplicationHealth -Identity <Mailbox Server>

run this against each server in the DAG.

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joyceshen-MSFT answered joyceshen-MSFT commented

Hi @Andrea-5818

Yes, you can reboot a DAG witness server but only if your DAG cluster is operating with all of its members online.

An FSW (file share witness) will only come into play during a failover scenario. This means that it will become a problem if a DAG member fails at the exact same moment your FSW is rebooting, because the remaining DAG member will then not achieve majority, causing the cluster to fail completely.

Note that if you reboot the FWS often in a short period, the cluster will mark the FWS as unreliable and fail the cluster. In that case, you should manually bring it back online by running the following PS cmdlet on a DAG member:

Get-ClusterResource | Start-ClusterResource


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Hi @Andrea-5818

Is there any progress about your issue so far? Have you succeed rebooting your witness server?


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