Hello, We study quite extensively the performance of virtualized systems (mainly open source but VMWare as well). Even if this is an aging report you can find the key results here : http://www.slideshare.net/bligneri/comparison-of-open-source-virtualization-technology (note : this is only a presentation of a more complete M.Sc. in Computer Science in French.).
We strongly recommend not to virtualize any file server if you expect some load. Even VMWare with supported hardware and software stack can be a real PITA : we had some very bad experience for one of our customer (40000+ users and several TB of shared space). Virtualization does not play well with high performance I/O and when you pay the premium for you nice SAN, Fiber channel, switch, extra-powerful servers you can accept a small performance drop but in our case stability problems are the real trouble and much worse to diagnose and address. For databases, results are in line with the precedent item : if intensive I/O is expected and you want best performance and, once again, the best stability then ... same analysis. Also, even if some benchmark exists for virtualization, I strongly encourage you to use your own load as a benchmark : this provide the more accurate results and limit surprises during the roll-out. Ben On Wed, May 12, 2010 at 3:25 AM, David Peall <[email protected]> wrote: > On Wed, 2010-05-12 at 10:19 +0300, Imre Gergely wrote: > > With KVM guest, is that performance measured using virtio? If not, > > maybe > > you could try that. > > > > > > With virtio using a block device I get: > Throughput 45.2551 MB/sec 100 clients 100 procs max_latency=27865.397 > ms > > -- > David Peall > Domain Name Services > > -- > ubuntu-server mailing list > [email protected] > https://lists.ubuntu.com/mailman/listinfo/ubuntu-server > More info: https://wiki.ubuntu.com/ServerTeam > -- Benoit des Ligneris Ph. D., CEO Revolution Linux http://www.rlnx.com/
-- ubuntu-server mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
