The case for virtualisation?
I’ve tried to understand why I would want it. Most applications I run require 100% of the server resources so sticking 20vm's on one server doesn’t get you 20 servers, it gets you 20 slower servers with an overhead for the VM-OS.
The one situation I can see it being useful is large scale distributed servers for processing information. Such as large websites. Where one can have a single copy of a virtual OS, with the sites source code replicated onto all the servers. Need to update all your servers? No problem, update the original VM image and reload the OS's sequentially. That only works if you have a propperly connected SAN + database system.
The other application is legacy software that only runs on nt4....
Has anybody any other insights into why they use VM's?