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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
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.