We're trying to consolidate servers. During the dot-com boom, every department in my company bought its own servers, so we have departments running Solaris/SPARC, Mac, WinTel, HP-UX and more. We've got 1,800 in-house users and about 5,000 users who access many of our servers and applications over the Web. We want to bring as many servers as possible into our main datacenter. What are the advantages of moving to a Linux HPC cluster (probably with Dell servers) instead of going with a mainframe? Are there other architectures that we should look at?