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Scaling Up is taking what you’ve got, and replacing it with something more powerful. From a networking perspective, this could be taking a 1GbE switch, and replacing it with a 10GbE switch. Same number of switchports, but the bandwidth has been scaled up via bigger pipes. The 1GbE bottleneck has been relieved by the 10GbE replacement.

Also see: Scaling Out

Source: https://packetpushers.net/scale-up-vs-scale-out/