I want to mount an oversized indexer to be able to receive a minimum of 10GB of data per day.
As for the operating system, I had thought about Centos 7.
Do you have any other recommendation in particular? How much space would I need to leave for the operating system disk to install splunk?
You tagged the question as Splunk Enterprise Security, but it seems like it's not specific to that product. Perhaps you meant to use the "Splunk Enterprise" tag?
Check out the sizing calculator at https://splunk-sizing.appspot.com/