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It is only a matter of listing computers and associating them with a name. Lets make an example of defining the following 5 collectives in a hypothetical production facility:
Rackmount-1 → The servers located in rack number 1.
Rackmount-2 → 2 → The servers located in rack number 2.
Lighter-A A → A group of servers you want to dedicate to lighter A.
Lighter-B B → A group of servers you want to dedicate fo lighter B.
All-servers servers → All the servers.
Assuming the facility has 10 servers, named server01 to server10, here is how to build the JSON file for the above 5 collectives:
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