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k001 [openvz] | HP labs has performed and published a performance evaluation of OpenVZ and Xen for server consolidation. The 14 pages PDF can be viewed here: HPL-2007-59R1.pdf (418K). Update: links to the paper updated. I wrote about a Xen/OpenVZ comparison last month here -- the one that was done by a German student as his thesis. I am really glad to see another third party evaluation. (I would never ever trust any comparisons done by or sponsored by vendors.) I also like the level of details provided. Here are quotes from the last section: For all the configurations and workloads we have tested, Xen incurs higher virtualization overhead than OpenVZ does, resulting in larger difference in application performance when compared to the base Linux case. <...> For all the cases tested, the virtualization overhead observed in OpenVZ is limited, and can be neglected in many scenarios. For all configurations, the Web tier CPU consumption for Xen is roughly twice that of the base system or OpenVZ. Does that mean OpenVZ is better for scenarios such as Linux servers consolidation? Yes, much better. Does that mean Xen is not good? No, not really. Xen has its applications as well (say when you also want to run Windows on the same piece of hardware), and in fact OpenVZ and Xen can nicely and happily co-exist. | ||
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You can take a precreated VMware image for, say, CentOS 4 and then follow OpenVZ installation instruction — it should take no more than 10 minutes. If somebody will create and host VMware OpenVZ image, that'd be nice.
We will also prepare a LiveCD distribution of OpenVZ soon.
We will also prepare a LiveCD distribution of OpenVZ soon.
Great idea. I will follow your suggestion. I have Vmware image with Centos 5 + OpenVZ + OpenSUSE os template onboard. So I will publish it as soon as I will find suitable hosting.
(Anonymous) on April 26th, 2007 - 07:28 pm
OpenVZ and Xen, both on the same kernel
OpenVZ and Xen, both on the same kernel
I am using OpenVZ on centos 4.4 as host and centos, suse as guest. It works great.
You assert that:
"in fact OpenVZ and Xen can nicely and happily co-exist"
that's why I would like to ask you if this is true and if I can have the same kernel patched for Xen and also OpenVZ to play arround with them in the same time, only for testing, not for production server.
Can you provide a kernel which has both?
thank you,
Ionut
You assert that:
"in fact OpenVZ and Xen can nicely and happily co-exist"
that's why I would like to ask you if this is true and if I can have the same kernel patched for Xen and also OpenVZ to play arround with them in the same time, only for testing, not for production server.
Can you provide a kernel which has both?
thank you,
Ionut
Currently we do not have kernel which has both Xen and OpenVZ — but we try to implement that in our RHEL5-2.6.18 branch, with the help of our users. Latest kernel from this branch (2.6.18-8.el5 028stab031.1) already includes a few patches towards that (search for xen in this changelog if you are curious). Finally, we have an open bug report in our bugzilla (bug #557) to make Xen working — you can add yourself to Cc to this bug if you are interested in its progress.
This is a livejournal community for OpenVZ users and developers. It is devoted to virtualization technology as a whole, and OpenVZ in particular. Certainly you can post your thoughts here as well.
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Question about OpenVZ on Vmware
Is it possible to evaluate OpenVZ enabled virtual appliance? Right now it's quite a challenge to install OS and OpenVZ on it. So maybe where are virtual image with OpenVZ for Vmware, Xen or Qemu? Or maybe instructions how to do it?