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Comments
from provider's or user's point of view?
OpenVZ. It's much better than KVM if you choose a good provider.
Reliability? KVM
Speed? KVM or OpenVZ
Antiquated but stable? Xen
Raw Speed that kicks PV's ass : OVZ
I see more of a containerization world coming about with Docker, CoreOS, etc.
People are starting to wake up and realize benchmarks matter, especially at scale. No need to virtualize the entire OS when it's very redundant.
Kvm
KVM. Strictly not touching OpenVZ.
OpenVZ fan here!
OpenVZ & Xen. Not touching KVM anyway, system loss, speed loss.
Lots of people seem to be forgetting the "and why" bit here
KVM - If it runs on bare metal, it runs on KVM
No, because security matters. How complicated is a hypervisor vs the Linux kernel? If we can't make a hypervisor that's actually secure (consider, for example, the recent Xen bug), how the heck is the whole Linux kernel going to be secure?
If I need to run Windows then I'll pick VMware because it's what I know and trust.
If I don't need to run Windows then I pick OpenVZ hands down because of the performance, stability, and the ability to adjust resources without a reboot.
I Think the best is VMWare ESXI, its powerfull, easy, full controlled and have full fuctions on managing Linux and Windows servers.
System loss and speed loss are only because of an incompetent person configuring the system... Like with most tools
Not Really. Full Virtualization will always take resources to run. And People mostly dislike OpenVZ because of being Oversold Much but if you don't oversell, then OpenVZ has the best performance of all.
OpenVZ and KVM.
For low RAM nothing beats OpenVZ
Thanks everyone for your input
OpenVZ for fast deployment where it may be needed (really handy for testing a lot of things and doing a quick reinstall).
Generally KVM however due to full hardware virtualization. After that XenHVM which is about the same as KVM but if I could I'd use KVM over XenHVM.
My two cents.
Xen because reliable and advanced network features.
XEN
KVM
im OpenVZ fan, its easy upgradeable for user's point of view like me.
and if still need more resource after upgrade it, i will migrate it dedi.
if its for client project, i will go with KVM
VMware or KVM is my choice
Don't like XEN due to the Kernel Support. can be slightly annoying. and a lot more frequent reboots then what is required on KVM.
VMware due to the high density it has. You can get more from the Hardware that you have. without effecting the stability. even limitations of the resources CPU/Memory/IO Just sucks that there is no rate limiting for the network. either 100Mbps or 1000Mbps Adapter.
KVM is rock solid. used it on several production nodes without any issues. It's easy to manage and uses the mainstream kernel. So you can get access to kernel updates with Kernelcare or kpslice. But my main choice would still be VMware.
KVM