Its not linux or distributions fault that vmware may package their software stupidly. (migration of vmware instances around a cluster is now subsecond, and very fast with XEN, if you use appropriate shared SAN storage for your underlying disk images and memory can be moved too if there’s a chance) * they depend on the stability of the host OS. * if you’ve got a machine full og 15 vmware instances running – pull the powercord – and poof! all of them gone. There are some weaknesses which get overlooked by all the virtualisation hpe these days: or you can migrate vmware insances around physical hardware to meet demand or in the event of hardware failure, in a cluster say. * you can provide OS/application stacks – there’s a webste full of “vmware images” from firewalls to fully confugured CMS systems… you can install and debug without real hardware and install media. * excellent for software development, OS development, testing, especially as you can freeze and take OS snapshots. In essense, you’re using all those idle cycles – i’d like to hear from Greenpeace about all those servers idle 99% of the time! Emulation/virtualisation can be more efficient – for N physical severs you can have M instances of an OS with an application stack running, where typically M>N.
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