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Re:Homelab 10“ mini-rack shelves by d4a on Friday September 16, 2022 @08:51PM (#32873812)
There are 21" racks in use at some hyperscale clouds with OCP

https://www.opencompute.org/blog/introducing-the-open-rack

Re:Homelab 10“ mini-rack shelves by kjellsbells on Friday September 16, 2022 @11:23PM (#32874488)
Another form factor: In telecom, 23" two post racks are common. Very handy to be able to get to both front and back ports, plus top access from the ceiling for the grounding and other wacky stuff that telcos use
Re:Homelab 10“ mini-rack shelves by dicknuckle on Friday September 16, 2022 @11:11PM (#32874436)
Traditionally, 23" racks are for batteries and behemoth class network gear chassis.