Re: question on kvm

Alex Jia <ajia@xxxxxxxxxx> · Fri, 23 Dec 2011 11:02:14 +0800



    On 12/23/2011 10:14 AM, hero wrote:
    
      
        hello everyone:
        during the days I use kvm,I have got some questions I want
          to know,please read the following questions.
         
        1.When a kvm VM is running, I use 'virsh setvcpus
          <domain> <count>' to change the cpu numbers of the
          VM, and when I use 'virsh dumpxml <domain>',there is a
          change from '<vcpus>count</vcpus>' to '<vcpus
          current="currentcount">count</vcpus>', just because
          of this I can't start the VM after I shutdown it. could you
          help me about this.
      
    
    It works well for me, the guest can be successfully started after
    shutdowning, what's the libvirt version? 

    
        2. when I use "virsh setmaxmem <domain>
          <value>" to change the max memory of the kvm VM, it says
          "error: Unable to change MaxMemorySize

          error: this function is not supported by the connection
          driver: virDomainSetMaxMemory", I want to know if libvirt has
          bugs or not.
      
    
    Also work for me, for a running domain, will meet the following
    error as expected:

    
    # virsh setmaxmem vr-rhel5u7-x86_64-kvm 1048576

    error: Unable to change MaxMemorySize

    error: Requested operation is not valid: cannot resize the maximum
    memory on an active domain

    
    For a inactive domain, original Max memory is 524288 kB, the change
    is valid:

    
    # virsh dominfo vr-rhel5u7-x86_64-kvm

    Id:             -

    Name:           vr-rhel5u7-x86_64-kvm

    UUID:           663ce18a-e257-2b05-91ae-fe29381b3a2f

    OS Type:        hvm

    State:          shut off

    CPU(s):         3

    Max memory:     1048576 kB

    Used memory:    524288 kB

    Persistent:     yes

    Autostart:      disable

    Managed save:   no

    Security model: selinux

    Security DOI:   0

    
        3.It works fine except I reboot the VM after I use "virsh
          setmem <domain> <value>" to change the kvm VM boot
          memory, for example, I change the memory 3000000k, but it can
          not save the value the next time to reboot.
      
    
    You should see options family of virsh setmem such as --live,
    --config and --current:

    
        --config         affect next boot                          
    Note: it is a option what you want.      

        --live             affect running domain

        --current       affect current domain

    
    Good Luck!

    Alex

    
        Best wishes and Merry Christmas!
        SunYongGang
      
      
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