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  • 1.  Performence issue

    Posted Aug 27, 2010 12:14 AM

    Hi All,

    Can some one let me know best practice to have better performance in virtual machine and differtent ways to find out to performance issues by exploring the VM logs



  • 2.  RE: Performence issue

    Posted Aug 27, 2010 12:43 AM

    what kind of performance issue are you talking about?

    Windows Linux VMs?

    this can be very helpful

    http://www.yellow-bricks.com/esxtop/

    and this too

    http://communities.vmware.com/docs/DOC-10352



  • 3.  RE: Performence issue

    Posted Aug 27, 2010 05:37 PM

    Hi Kopper,

    Thanks a ton



  • 4.  RE: Performence issue

    Posted Aug 27, 2010 09:11 AM

    Welcome to the forums!

    Performance issues are tracked with "esxtop" on the service console.

    Please describe whichissue you're facing. Your statement is too general as you can have issueswith CPU, network and storage.

    However, there are best practices available:

    http://communities.vmware.com/servlet/JiveServlet/download/10352-1-28235/vsphere4-performance-troubleshooting.pdf

    http://www.vmware.com/pdf/Perf_Best_Practices_vSphere4.0.pdf

    http://www.vmware.com/files/pdf/techpaper/vsp_41_perf_VC_Best_Practices.pdf


    AWo

    VCP 3 & 4

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  • 5.  RE: Performence issue

    Posted Aug 27, 2010 06:23 PM

    Mr AWO,

    Thaks for your last comments

    We have a virtual machine running with " Oracle Enterprise linux 5.4 " it got rebooted 4 times since two weeks. I looked into VM log files i observed high memory utilization and memory ballooning happned for few mins. now its being hard to take decision weather its problem with the OS or the VM problem.

    following is the VM configuration

    RAM 65gb

    CPU 4vcpu

    OS Oracle Enterprise linux 5.4

    Has 2 TB harddisk

    VMDK distributed over 4 different datastores

    VMware tools V7

    HA enabled

    DRS is enabled and migration threshold is medium



  • 6.  RE: Performence issue

    Posted Aug 27, 2010 06:44 PM

    If you are experiencing ballooning inside of the VM then that's a sign of memory contention of the host the VM is running on. You may want to look at moving that VM off to another host which has more memory available or increasing the amount of memory available on the host.






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  • 7.  RE: Performence issue

    Posted Aug 27, 2010 07:56 PM

    well I think a VM ballooning won't make it reboot...... just imaging in a test environment where a lot people stress their environment... how could they measure that if a ballooned VM reboots itself or multiple VM reboot.....

    if your VM reboots that frecuently start I think at the OS level.... patches...fixes....

    let us know what else you got in your virtual environment any other VMs?

    check this article

    http://www.yellow-bricks.com/2010/06/10/is-this-vm-actively-swapping-helping-heiner_hardt/

    might apply to your case I mean about the 65GB memory assigned to that VM.



  • 8.  RE: Performence issue

    Posted Aug 27, 2010 08:00 PM

    I agree that ballooning would not reboot the server but it would cause some adverse performance. The article by Duncan is a good one.






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  • 9.  RE: Performence issue
    Best Answer

    Posted Aug 29, 2010 09:24 AM

    CPU 4vcpu

    If you have balloning you have assigneed too much memory to the guest or you have too less memory in the host.

    The guest has 4 vCPU's? How much does the host have? Reduce the vCPU count to two. Having more vCPU's doesn't mean having more performance in a guest in a virtualized environment. That behaves somewhat different here.


    AWo

    VCP 3 & 4

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