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Not just rack space. At a certain amount of disks you also need to get a separate server (chassis + main board + cpu + ram) to host the disks. Maybe you need that for performance reasons any way. But saving disk space and only paying for it with some ram sounds cost effective.

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That works out only as long as you don’t have to replace the whole machine (motherboard & possibly CPU/CPUs) to be able to add more RAM… So essentially the same problem as with disks.

In the end it all comes down to: there are a whole lot of trade-offs that you have to take into account, and which ceilings you hit first depends entirely on everyone’s specific situation.

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