MW-IMG_4069.JPGMichael Webster
is among a small number of Nutanix Platform Experts (NPX-007) and VMware Certified Design Experts (VCDX-066), currently the only NPX and VCDX in New Zealand, and a vExpert, with deep experience delivering project management, ITIL based VMware operational readiness and technical architecture consulting services to enterprise and service provider clients around the world. He works as Principal Enterprise Architect as part of the Engineering / R&D Team for Nutanix, but this is a personal blog and does not represent the views or opinions of anyone else. He has been using VMware products since 1998 and has been designing and deploying VMware solutions since 2002. He specializes in the design and implementation of virtualization solutions for Unix to Linux migrations, business critical applications, disaster avoidance, mergers and acquisitions, public, private and hybrid cloud and software-defined datacenters. Michael has been in the IT industry since 1995 and consulting from 2001 to 2013 before joining Nutanix. He has established a niche as one of the global subject matter experts on virtualizing business critical applications i.e. SAP, Oracle, Java Systems, MS SQL Server, MS Sharepoint, MS Exchange and Monster VM’s. Michael is co-author of the book Virtualizing SQL Server with VMware: Doing It Right by VMware Press with Michael Corey and Jeff Szastak. In addition to this book he was technical reviewer of VCDX Boot Camp and Virtualizing and Tuning Large-Scale Java Platforms, both published by VMware Press. Michael is regularly called on to speak on all aspects of virtualizing business critical applications at events and for organizations all across the globe. was recently voted as one of the top 15 virtualization blogs (#13) in the world as listed on

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    13 Responses

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    6. Jochen Halwachs
      Jochen Halwachs at |

      I read your post according RAC on VMWare.

      Would it be possible to get details/scripts for the synthetic tests and testplan (think you use swingbench ?) and how to gather and compare testresults (service time, response time) – that would be very cool.

      Whats about the jumbo frames for interconnect (real performance boost ?) – what is important and what have to be changed or what must be supportet on switch layer ?

      How long does this take if there is no experience in this testing – days, weeks or more ?

      Do you have experience how long it takes to evaluate Real Application Testing (my problem is not much time and budget :-))

      Thank you

      ng, jochen

      1. @vcdxnz001
        @vcdxnz001 at |

        Hi Jochen,

        For the tests I've done I've used swing bench. VMware has also done a number of benchmarks using swing bench. It is freely available on the internet. Each version of swing bench is very different so the one you choose is the one you'll need to use for all the tests else the results will vary greatly if you cross versions. A documented test plan would be something that's only available as part of a services engagement.

        Jumbo Frames on the interconnect is definitely recommended. It will reduce CPU load and improve packet response times in general if using modern NICs. But like anything it should be validated. I've done a lot of testing with Jumbo Frames on 10Gb/s links and it makes a big difference. With 11g R2 you can specify multiple interconnects and the benefit across the links will add up. In order to use Jumbo Frames you need to make sure all the devices in the network path between source and destination support the larger size packets (9000 normally). If you're using this only on the interconnect this should be very easy to achieve as it should be a private network. In that case only the switch ports used by the interconnect need to be modified. Be aware though that some switches need a global setting changed and that might require a reload / restart of the switch. You should seek advice from your network team.

        I would say if you have no testing experience it'd take a few weeks to get up to speed. You also need to make sure you have a solid plan on how you will measure the test results. You can use Oracle Enterprise Manager in addition to other tools such as Vmware's vFabric Hyperic, VMware vCenter AppSpeed or AppInsight. AppSpeed is the tool I used to measure the application transaction latency.

        1. Jochen
          Jochen at |


          I have testet also with Swingbench but realized when running the same tests on an RAC with physical hardware – I could not compare it because the I/O and other things rise up to much and I have to stop the test after 2-3 min with only 5 sessions (I have testet to exclude warehouse queries and other but always the same results) 10GB source data.

          In comparision to the RAC on VMWare I could run up to 800 sessions and near 50000 tps without a Problem. Setup on phy. RAC and RAC on VMWare is similar.

          Also we have troubles with real workload (etl jobs).

          The problem is that create index works in parallel as expected but an direct path load with parallel manually or auto DOP works not so good (1-2 subprocesses do the whole work but the other do nothing and it seems therefore we have only ~15% I/O than on physical hardware.

          Now we try to tune the VMWare Layout more vmdk files and tune memory and some other things and also VMWare 5.0.

          It seems the experience is physical hardware have more ressource and capacity to handle such workload and it works better out of the box than on VMWare you can compensate it a litte to use more clusternodes with less VCPUs – but you buy that with the risk of concurrency and other cluster waits.

          Maybe someone have the same or similar problem with parallel (DOP) and can exchange the technical details (RAC on VMWare).



    7. vmexchange
      vmexchange at |

      Hi Michael

      I very keen to get my VCAP5-DCA & VCAP5-DCD this year would you be able to shed some light as to what I need to read up on to prepare for the exams?

      Also I've invited you to join my linkedin network.

      My Blog @ I'm just starting out on the blog thing.


      Shahidul Alam.

    8. Data Centers Down the Street? What the Experts Predicted Will Happen to IT | VMware Company Blog - VMware Blogs

      […] an acclaimed futurist, MD of Foresight at Discern Analytics, and a Stanford University professor; Michael Webster, a New Zealand-based virtualization and cloud expert; Mark Burgess, researcher, author and […]

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