Exchange 2019 DAG File Share Witness folder is not creating

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InnocentHeartvoice-2401 asked Apr 18, '22 InnocentHeartvoice-2401 commented Jun 27, '22

Exchange 2019 DAG File Share Witness folder is not creating

I have configured Exchange 2019 DAG of three Exchange 2019 servers, the DAG is working fine as databases are switching to other server if primary server goes down but I notice that FSW folder is not created on the File server. I changed the Witness server and created new directory on other server through Power-Shell and cmdlet ran successfully without any error but no directory found on new server in Witness folder. Assigned all the required permission and added Exchange Trusted subsystem with full control.

Kindly assist.

office-exchange-server-administration office-exchange-server-connectivity office-exchange-server-itpro

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Answer 1 · 2022-04-18T12:03:02.72Z

AndyDavid answered Apr 18, '22

In a odd number DAG, the File Share Witness is not used.
Its only used when there is an even number of members in the DAG

https://docs.microsoft.com/en-us/exchange/high-availability/manage-ha/manage-dags?view=exchserver-2019#dag-witness-server-and-witness-directory

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Answer 2 · 2022-04-18T13:37:02.7Z

InnocentHeartvoice-2401 answered Apr 18, '22 InnocentHeartvoice-2401 edited Apr 18, '22

Hello Andy,

Thanks for your valuable response. I was more curious the reason is when I executed the cluster validation test having this warning message. The cluster is not configured with a quorum witness. As a best practice, configure a quorum witness to help achieve the highest availability of the cluster.

The other disturbing message was on the Server Manager: Under Manageability - Online- Data retrieval failures occurred on the DAG servers name and IP addresses.

I was thinking the main reason of FSW folder is not creating because of these errors.

Can you please provide your usual support on these error and warning.

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Answer 3 · 2022-04-18T13:39:38.69Z

AndyDavid answered Apr 18, '22

See:
https://markgossa.blogspot.com/2016/01/dag-doesnt-match-configured-witness-server.html

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Answer 4 · 2022-04-18T13:44:36.097Z

InnocentHeartvoice-2401 answered Apr 18, '22 InnocentHeartvoice-2401 edited Apr 18, '22

There is no error message while creating DAG even as I mentioned that FSW directory on other server was successfully created. One more thing the cluster quorum type = Majority

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Answer 5 · 2022-04-18T13:58:30.177Z

AndyDavid answered Apr 18, '22

thats expected since you have an odd number of node
cluster quorum type = Majority

If you had an even number of nodes in the DAG, it would be "Node & File Share Majority"

You dont need the FSW with odd members

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Answer 6 · 2022-04-19T04:48:17.72Z

InnocentHeartvoice-2401 answered Apr 19, '22 InnocentHeartvoice-2401 commented Jun 27, '22

What about the second part of my question:

Server Manager: Under Manageability - Online- Data retrieval failures occurred on the DAG servers name and IP addresses having message. Kindly assist.

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joyceshen-MSFT · Apr 19 at 05:23 AM

Hi @InnocentHeartvoice-2401,

Below is a related thread discussed the same issue:
Win Svr 2016 VM error in Server Manager: "Online - data retrieval failures...
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

open command prompt with admin rights and execute it as below:

 cd C:\Windows\System32\wbem\AutoRecover 
 for /f %s in ('dir /b *.mof *.mfl') do mofcomp %s

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InnocentHeartvoice-2401 joyceshen-MSFT · Apr 21 at 04:58 AM

I had executed the cmd but nothing happened, the error message is still showing.

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joyceshen-MSFT InnocentHeartvoice-2401 · Apr 22 at 06:09 AM

Hi,

You could also check if your issue is related to the registry key mentioned here: Server Manager: Under Manageability - Online- Data retrieval failures occurred

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