So I have some questions about the included rails that the primary ebay sellers offer. Are these the real Dell rails Y3DX1? What is the minimum rack size (post to post) to use them? Do they fit on square holes?
I bought mine from
mobile_computer_pros (specific listing linked).
The rails I got look OEM, but don't have a Dell part number on them. Fully collapsed, they're 24.25". You'd need to extend them a little to snap them into a rack. They're square hole compatible with snap-in clips, similar to recent Dell RapidRails I've used there. I saw someone mention somewhere that the rails they received were for use only with a round hole rack, but that seems very unlikely to me. I wonder if they were just unfamiliar with the round appearance of the bolts that slip into square-hole racks, or maybe I'm mis-remembering and they just said they worked with a round hole rack.
I hadn't even given them a second look until now, but they're not quite what I expected. I don't have a 4 post rack at home to try them in. They look like they'd install in the rack and then the server would just be inserted and lay on top of them, like most UPS rails I've used. They don't appear to be able to slide the attached server out of a rack for maintenance.
There are two little clips that stick out of the sides of the server that look like they'd be used to attach to a set of rails, but there aren't any accommodating holes on the set of rails I received.
As far as I can tell, they do look identical to
Y3DX1 as shown here. Mine are marked King Rail.
Perhaps the C6100 just didn't come with slide-out rails since the C6100s were designed for big cloud environments and maintenance of the internals wasn't a priority. There's not really all that much to get at inside the case with the hot-swap trays, so I guess it makes sense.