Re: KVM in HA active/active + fault-tolerant configuration

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On Thu, Aug 22, 2013 at 5:47 AM, Brian Jackson <iggy@xxxxxxxxxxx> wrote:
> On Wednesday, August 21, 2013 3:49:09 PM CDT, g.danti@xxxxxxxxxx wrote:
>>
>> On 2013-08-21 21:40, Brian Jackson wrote:
>>>
>>> On Wednesday, August 21, 2013 6:02:31 AM CDT, g.danti@xxxxxxxxxx wrote:
>>> ...
>>
>>
>> Hi Brian,
>> thank you for your reply.
>>
>> As I googled extensively without finding anything, I was prepared to a
>> similar response.
>>
>> Anyway, from what I understand, Qemu already use a similar approach
>> (tracking dirty memory pages) when live migrating virtual machines to
>> another host.
>>
>> So what is missing is the "glue code" between Qemu and KVM/libvirt stack,
>> right?
>
>
> Live migration isn't what you asked about (at least not from what I
> understood). Live migration is just moving a VM from one host to another.
> That is definitely supported by libvirt. Having a constantly running
> lock-step sync of guest state is what Qemu/KVM does not support. So with
> Qemu's current live migration abilities, if HostA dies, all it's guests will
> have downtime while they are restarted on other hosts.
>
>

Live migration is not proper for support VM HA, when host went wrong,
these VMs on the host must be restart on another host based on the
same storage.

I have googled for KVM FT for a while, but only find a project called
Kemari which was no longer updated.
I read some article about KVM FT, which said KVM may be support it in future.


>>
>> Thanks again.
>>
>>>  ...
>>
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