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If "Master/Slave" terminology in computing sounds bad now, why not change it to "Dom/Sub"?
(lemmy.dbzer0.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
It's used in Cisco networking and Red Hat bonding that I know of. Changing it to primary/secondary IMHO is better and more clear.
I likely have not been in a large enough setup to encounter that. Usually just one router and the bunch of switches.