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Re: [libvirt] Safe? /etc/libvirt/qemu on shared storage?



On Fri, Oct 2, 2009 at 11:22 AM, Chris Lalancette <clalance redhat com> wrote:
> James Brackinshaw wrote:
>> Hello,
>>
>> I have a directory /mnt/shared-storage where the disk files for kvm
>> live. Live migration works well, but I have a problem: after a
>> migration I see two guests, one on the original host "shutoff" and one
>> on the new host "running".
>>
>> I'd like to see the guest only on the host it is running on.
>>
>> Would it be safe/recommended to put the /etc/libvirt/qemu directory on
>> shared storage? What would the best way of doing this be?
>> Is this lock safe?
>
> No, this is not safe, and won't do what you expect either.  This will almost
> certainly corrupt your guest config files.
>
> Currently, the migration code assumes that you want to leave the migrated guest
> defined but not running on the "source" of the migration, and that you want to
> leave it running but not defined (transient) on the "destination" of the migration.
>
> I have some upcoming patches to the migration code that allow you to tweak the
> behavior.  That is, they allow you to undefine the guest on the source if you
> wish, and/or permanently define the guest on the destination if you wish.

This sounds excellent, just what I need. Looking forward to it.


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