Resources - issue brief

so... Help clear this for me once and for all. I don't understand why there is the same reserve, limit, unlimited, and stock options RAM when you create a virtual machine. BONES of the VM (in my case w2k3) is unable to dynamically adjust the amount of memory... right? So I don't understand why they don't have just the amount of RAM you enter this machine comes out the pie, and that's it. Is there something that I am missing?

RParer and I give different parts of the image - so let go through piece by piece-

  1. Available memory - this is the amount of memory, the guest operating system will know that he has access to. This is what is indicated when you query the o/s comments on his memory.  Now if your virtual machine uses less memory then what was awarded - the vmkernel (the operating system of your ESX Server) will provide only access to memory by using the o/s comments - as the o/s comments uses memory more and more that the vmkernel will give access to this memory until available memory defined at the virtual machine

  2. Reservation of memory - this ensures guest o/s of the virtual computer will have a certain amount of memory when the virtual machine are fighting for memory - but if the virtual machine is not using its reserve may refer to other virtual machines.

  3. Memory - limit I really limit memory as a tool for you as an administrator to the memory - consumption cap I really use it when people build virtual machines with the available memory, the value at top - now that stop the virtual machine to access the memory of all the memory available to it - no, it's not.  The virtual machine starts by using the by swap file vmkernel VM - see overcommit below -.

Overcommitting memory is possible with ESX because of 3 things the vmkernel does for free memory

  1. Transparent Page Sharing - the vmkernel see the pages being stored by each VM and identifies these pages that are identical.  These pages are stored in the memory of COW (copy on write) - read pages only as long as the virtual machine is reading this page.  The minute that he will write to the page of a copy is made and writing made to the copy - so that you an ESX host that is running several virtual machines with the same or similar operating systems can save a ton of memory.

  2. The balloon pilot - it is installed in the virtual machine with VMware Tools.  This will allow the vmkernel influence the way in which the guest operating system uses its own virtual memory.  When the memory is unusual the vmkernel will be initimate causing ball player the vm swap memory on the disk, thus freeing up memory resources to the vmkernel to assign to other virtual machines

  3. the vm vmkernel swap file - if the vmkernel is out of memory, released as much memory as it can with the transparent page sharing and the balloon pilot and the vms system always require memory, it will use these spaces of Exchange by default on the same VMFS datastore than the VMware configuration file and swap the memory of VMs on the disk.  It is the memory of last resort and the execution of the will be significantly diminished.

So, with the data you provided what you see are two things - 1) when the virtual machine is at rest that it uses not the total memory available and 2) transparent Page sharing in action - and to answer your last question - the best of words instead of memory of pulling away is the vmkernel will only provide the memory using the VM's and Yes to change the available memory you will need to you restart the virtual machine.

If you find this or any other answer useful please consider awarding points marking the answer correct or useful

Tags: VMware

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    Tracing not lit.
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    Tracing not lit.
    AMT error struct:
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    Tracing not lit.
    AMT error struct:
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    Tracing not lit.
    AMT error struct:
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    Tracing not lit.
    AMT error struct:
    NS main err in code: 12564
    AMT-12564: TNS:connection refused
    NS secondary err code: 0
    NT main err in code: 0
    NT secondary err code: 0
    NT OS err code: 0


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    AMT for Solaris: release 10.2.0.4.0 - Production
    Protocol TCP/IP NT to Solaris adapter: release 10.2.0.4.0 - Production
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    Tracing not lit.
    AMT error struct:
    NS main err in code: 12564
    AMT-12564: TNS:connection refused
    NS secondary err code: 0
    NT main err in code: 0
    NT secondary err code: 0
    NT OS err code: 0


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    Fatal OR connect error 12520, connect to:
    (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=MD1SILNXDB03)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=TRO10G1)(CID=(PROGRAM=HBFCalcImputedObservationsDebug64)(HOST=md1sisun26)(USER=TROBat01)))

    VERSION INFORMATION:
    AMT for Solaris: release 10.2.0.4.0 - Production
    Protocol TCP/IP NT to Solaris adapter: release 10.2.0.4.0 - Production
    Time: 7 February 2012 07:50:29
    Tracing not lit.
    AMT error struct:
    NS main err in code: 12564
    AMT-12564: TNS:connection refused
    NS secondary err code: 0
    NT main err in code: 0
    NT secondary err code: 0
    NT OS err code: 0
    NS secondary err code: 0
    NT main err in code: 0
    NT secondary err code: 0
    NT OS err code: 0
    _____________________________________________________________________________________________


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    Thank you
    Niraj Rouault

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