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Linux - Virtualization and Cloud This forum is for the discussion of all topics relating to Linux Virtualization and Linux Cloud platforms. Xen, KVM, OpenVZ, VirtualBox, VMware, Linux-VServer and all other Linux Virtualization platforms are welcome. OpenStack, CloudStack, ownCloud, Cloud Foundry, Eucalyptus, Nimbus, OpenNebula and all other Linux Cloud platforms are welcome. Note that questions relating solely to non-Linux OS's should be asked in the General forum.

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Old 10-19-2015, 04:20 AM   #1
hahacc
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Question live migrate VM from xen-3.4(i686 )to xen-4.1(x86_64)


Hi folks,
Is there any way to live migrate VMs hosted on hypervisor with 32-bit DOM0 running xen-3.4 to 64-bit DOM0 running xen-4.1? I tried to do this, but it failed:

Code:
    [root@ovs2 ]# xm migrate -l testvm01 xen4-server
    Error: /usr/lib/xen/bin/xc_save 37 10 0 0 1 failed
    Usage: xm migrate <Domain> <Host>

    Migrate a domain to another machine.

    Options:

    -h, --help           Print this help.
    -l, --live           Use live migration.
    -p=portnum, --port=portnum
                         Use specified port for migration.
    -n=nodenum, --node=nodenum
                         Use specified NUMA node on target.
    -s, --ssl            Use ssl connection for migration.
Any suggestion is appreciated!
 
Old 10-20-2015, 11:02 AM   #2
dyasny
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When a VM is started, it has a specific configuration, that belong in the process, which really pertains to the features available in the hypervisor. When you live migrate, this metadata gets replicated on the destination hypervisor. So if you live migrate to a newer hypervisor that supports it, you gain nothing because the VM remains in the old state with none of the improvements. And if the new hypervisor removed or changed some of the old features, live migration will not even be possible. Same reason you can't live migrate between Intel and AMD CPUs really.

So, while I am not a Xen expert, I suspect you will definitely be better off starting the VMs cold on the new host.
 
Old 10-22-2015, 01:10 AM   #3
hahacc
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Quote:
Originally Posted by dyasny View Post
Same reason you can't live migrate between Intel and AMD CPUs really.
This is true case in our env. Thanks!
 
  


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