What is also important in the Ethernet world is the existence of channel bonding – notably LACP and EtherChannel. So if your Gigabit Ethernet network is creaking a little, simply run up a bonded pair and you have doubled your bandwidth with a piece of network string and a couple of commands on the LAN switches and server NICs.The reason why companies have not yet adopted 10GbE for their LANs is that although 1Gbps is not enough, a 4Gbps EtherChannel more than suffices. I have seen a lot of data centres where 10GbE implementations have crept first into the storage network, not the data LAN side.We have talked about connectivity, now let's talk about the servers you are hanging on the end of the string. Servers have three main elements: processors, memory and storage.I am going to get shot by the CPU police here, but the only fact that I think matters about processors (at least those for servers) is that with each new generation they get faster.Yes, the vendors also strive to decrease the power consumption per CPU cycle, and of course the speed increase is due only to ridiculously difficult innovations in miniaturisation, pipelining, on-board cache and the like. But the bottom line is that processors get faster without really costing more.

The story is similar with RAM. As time goes by, you can put more and more RAM into a single slot in a server at a lower and lower cost per gigabyte, but generally speaking the speed of the memory is not your first consideration when you are buying the kit. Quantity is what you look for in RAM.Although there is an overhead of a few per cent of your processing power and RAM if you layer virtualisation on top of the hardware, it is well worth the technological cost because of the ability to allocate resource dynamically and automatically to the virtual servers that sit on top.It means that in extreme circumstances you can give a single virtual machine almost all the resource of a potentially socking big physical host if it needs it for a short while. No need for bottlenecks there, then.Which brings us to storage. Now, my preference is for my servers to boot from a pair of mirrored on-board hot-swap disks, for two simple reasons: it doesn't cost much more than a diskless machine, and it means you can boot the beast even when it is not connected to the core storage.

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