Thomas, ZFS does require some CPU and RAM resources for best performance. The exact amout depends on many factors. As a very rough rule of thumb, 4-8 vCPUs and 1-4 GB or RAM should be sufficient for most scenarios. However, your milage will vary depending on you specific application requirements.
Comparing CPU utilization in a global zone to that in the primary/control/IO domain in a LDom config doesn't make much sense. There are too many different components involved. We've not seen sufficient configuration details (ldom setup, zfs setup, database setup, storage setup, container setup, application load profile, etc.) for any educated guesses towards the nature or cause of your issues. If you continue to observe insufficient application performance, I recommend you engage with your Oracle representative for some performance analysis. This will most likely resolve your issues. Best Regards, stefan On 11.06.10 08:52, Tom Kuther wrote: >> A better way to test I/Os is to use vdbench, with >> which you can simulate >> ifferent type of workload. But the best test is to >> run your applications, >> and see how it behaves and if you have unexpected >> response time. > > Yes, we had Oracle DB already installed and started test imports. Those take > about 50 minutes on our old V440, and we aborted them after 3.5 hours on the > T5220 LDOM. dd testing was the easiest way to show some raw numbers. > > Meanwhile I reconfigured the Machine to use zones instead. Disk speeds are > good. Oracle runs well in a seperate ressource pool. But while creating all > the datafiles I saw the global zone was under a load of 7.5 constantly. I had > the control domain set up with only 4 vcpus. Maybe that was the bottleneck > actually? Could it be that for ZFS backend one should assign at least 8 vcpus > to the control domain? > > Regards, > Thomas -- Stefan Hinker Systems LOB - Systems & Performance Sun Microsystems GmbH Tel: +49 6103 752-300 Brandenburger Str. 2-6 [email protected] D-40880 Ratingen http://www.sun.de/ http://blogs.sun.com/cmt http://blogs.sun.com/cmt/en --------------------------------------------------------------------------- Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten Amtsgericht München: HRB 161028 Geschäftsführer: Jürgen Kunz
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