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In a high availability DAG environment with multiple Exchange servers [in this case 2] what is the appropriate process for deleting the merge files?

I had this question after viewing Exchange 2013 - Index Merge logs.

I tried rebooting and the files remained.  So are these merge files being replicated (it would seem so) and if so what is the appropriate process for removing them? As stated we have 2 Exchange servers setup with a DAG database.

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Adam Brown

8/22/2022 - Mon
Jose Gabriel Ortega Castro

Hello Plafond412, Thank you for your question.

The problem here is that in the question you referenced there's no "DAG" configuration or specified anywhere, or even multiple servers so I assume that is a single database within a single server. So this "solution" is not viable in your scenario.

here's a more accurate answer related to your question


Adam Brown

Rebooting (Actually just restarting the search service) will clear only old, committed DAT files in those folders for a single server setup. If you have a DAG, the .DAT files from the other server will be replicated from the other server. If you want to clear those files in a DAG, you need to reboot both servers at the same time, I believe. That said, I've never seen any reason at all to clear them. If you don't have enough space for them and your database, start looking for more storage if you can. 

Hemil Aquino

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