It isn't about rack depth, but rack width. They are deep, but not unusually so.
Datacenters are not "built" with racks. They are not permanently affixed to the floor. Most datacenters do not keep empty racks on the datacenter floor, and keep the floor open.
If you are renting by the rack, no, most datacenters won't swap racks for you. You'd need to be renting entire cages for them to consider it.
Open Rack isn't really useful for small scale providers, it's more use to hyperscale companies like Facebook, Google, Amazon, and Microsoft. I don't think anyone we'd consider "medium scale" has adopted it (if I'm wrong, I'd love to see a story hit the front page about it).
Only one of those companies have adopted it, the others have considered it and, although they manufacture custom hardware and thus could take advantage of it easily, they have not done it.
I think Amazon does not want to use OpenRack, not sure if they consider it. I think they are in the position to negotiate good price from normal x86 server vendors or make them produce a modified version of a normal server (without the things Amazon does not need). I am curious what is up with them nowadays.
Datacenters are not "built" with racks. They are not permanently affixed to the floor. Most datacenters do not keep empty racks on the datacenter floor, and keep the floor open.
If you are renting by the rack, no, most datacenters won't swap racks for you. You'd need to be renting entire cages for them to consider it.
Open Rack isn't really useful for small scale providers, it's more use to hyperscale companies like Facebook, Google, Amazon, and Microsoft. I don't think anyone we'd consider "medium scale" has adopted it (if I'm wrong, I'd love to see a story hit the front page about it).
Only one of those companies have adopted it, the others have considered it and, although they manufacture custom hardware and thus could take advantage of it easily, they have not done it.