According to the cluster documentation, you can either define data nodes with:
[ndbd] NodeId=n HostName=126.96.36.199
[ndbd] NodeId=n ExecuteOnComputer=m [computer] Id=m HostName=188.8.131.52
I don't see a substantial difference between the two. The documentation has this to say:
The [computer] section has no real significance other than serving as a way to avoid the need of defining host names for each node in the system.
I'm stumped. If I have to define a hostname, what benefit is there to defining it in [computer] instead of [ndbd]?