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As for the subject at hand, -I- find VB a far inferior solution when it
comes to SMP and IO (disk/network) performance.
With the latest VB and the SATA controller I see faster performance in the VM over bare
hardware.
Sure, during the years I've create a large chunk of scripts
required to
deploy and configure qemu VM's, but once you pass the "I fear the qemu
command line" phase, KVM runs circles around VB. (Let alone having to
relay on a unsupported 3'rd party kernel module - a huge no-no in server
deployments)
VB kernel modules are GPL licensed.
Nothing beats starting a VM in snapshot mode, trashing it, and
reverting
to the original without as much a single mouse click...
VB supports snapshots too. I use them frequently.