If we enable DMC in Search head in a Production environment is there any impact on the searches.
I have a lot of historical searches are running on it.
Is it the Best practice to do?
Just enabling it will not cause any problems BUT, if you fully configure it and add non-indexers as search peers (which you have to do to get the full features/data), you will be creating potential search results data duplication, search delays, incorrect warnings and errors reported in the UI and other minor problems. None of these are serious, but it is still a poor practice.
is there any way I can roll back to the standalone mode.
Because it has 84 search peers and 90 cluster master
click settingdg dropdown -> general settings -> on the top line (your DMC instance name) on the right hand side click edit -> disable. notice it says "disabled" with a little red X
Do not click "Apply All Changes" afterwards
best will be to have a dedicated Search Head for the DMC (now MC)
read here:
https://docs.splunk.com/Documentation/Splunk/7.1.1/DMC/WheretohostDMC
and here more specific to your question:
https://docs.splunk.com/Documentation/Splunk/7.1.1/DMC/WheretohostDMC#Why_not_to_host_the_console_on...
hope it helps
Q) I have enabled DMC in distributed mode is there a way I can come back to standalone mode.