I put esxi on my old 5,1 that had 64gb of ram and used it for a test hadoop cluster. I also had like 8 macpro 1,1 and 3,1s as nodes. Now i use an old thinkcente

I put esxi on my old 5,1 that had 64gb of ram and used it for a test hadoop cluster. I also had like 8 macpro 1,1 and 3,1s as nodes. Now i use an old thinkcenter with 128gb or 192g. of ram as my main testbed. Back in the day I ran a bunch of sites off of spare equipment. Now my expectations are higher. But for backend stuff it's be fine, just design with failure in mind.