For some people servers have their individual "servernalities".

Like all metaphors, the pets vs. cattle one started to break down if you poked at it too hard. But it came from a place where individual servers were highly valued and were often at least somewhat unique. Standard operating environments had been around for a while but the "monitor the server's health and nurse it back to health if something's wrong" sentiment was still pretty widespread.

Even redundancy tended to be hardware-based to a significant degree. How much did the IT industry put into things like failover Unix clusters (and VAX/VMS etc. before that) over the years?