![]() ![]() Where you are building your data centre a server at a time you might not know how many servers will end up in the rack. If, for some reason, you are using coax to connect to the core then TOR might be the only way to reach the Spine switches. It’s unlikely that these racks will ever be changed/upgraded before decommissioning as they are operating on a ‘cloud SRE’ model.Ī quick diagram shows how much shorter the cables will be.Īnother dependency is your uplink cabling. Such customers have their racks assembled and tested off site before shipping to the DC. Active coax is for cable runs over 3 metres (but no more than 10 metres). This enables the use of cheaper and more reliable passive coaxial Ethernet for 25G/50G. The middle of rack solution is common when building “rack at a time” data centres (or more likely ten or more racks at a time). I wonder if you ended doing that anywhere? ![]() Something I recall from one of your podcasts a long time ago was the option of moving to “Middle of the rack” switches, and using cheaper AUI connectors instead (I think it was one of your earlier podcasts – I started listening after a blog post). ![]() I received the following question from Gavan: At higher Ethernet speeds where the cabling costs are outsized there is sense to placing the switch in the middle of rack but there are tradeoffs. It’s common practice to place network switches at the top of the rack. ![]()
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