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| Re: Does Virtualization Technology benefit my running OpenVZ? [message #10619 is a reply to message #10612] |
Sat, 24 February 2007 14:00   |
ehab
Messages: 15
Registered: February 2007
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Junior Member |
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No by vary nature openVZ and other kernel virtualization technologies like vserver do not NEEED CPU to have virtualization.
VMware and Xen allow you to have different kernels and operating systems on the same physical server, with this you need a lot of work or hardware support to have multiple kernels on the same physical server. But with openvz the same kernel ( albiet a modified one ) is shared accross all vps.
This means the following
no need for hardware virtualization
memory and CPU are seamlessly shared and can be dynamically allocated and even oversold between VPSs, whereas with vmware or xen memory allocation is fixed.
no slow hardware and disk access due to virtualization like in xen and vmware
Only one OS kernel can run, ie only linux so different VPSs can not have windows for example nor a different kernel.
Some operations can not be done in VPSs that are possible on physical hardware and XEN, VMware. Still Xen/vmware do have similar but less limitations.
If you are running only linux as a server and want multiple virtual machines on a dedicated server openvz is the way to go, if you just want to dabble and play around or want both windows and linux then go for xen/vmware.
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| Re: Does Virtualization Technology benefit my running OpenVZ? [message #10629 is a reply to message #10612] |
Sat, 24 February 2007 20:03 |
jarcher
Messages: 91
Registered: August 2006
Location: Smithfield, Rhode Island
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I have been looking t running Xen or VMware on my machine and then running Debian / OpenZY in one of the VMs. If I want, I can have two VMs with OpenVZ inside each one, one for production and one for testing. You could even put a Windows boz in a third. It all depends upon what your machine can do.
With VMWare (I don't know about Xen) your full virt machines can't have resources allocsted arbitrarily accross the VMs. If you have 4 BMs running, each one gets 25% of thye machine. That's the biggest problem.
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