Re: [Qemu-devel] question about qemu migrate.

[Sheldon <shaohef@linux.vnet.ibm.com>]

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On 07/23/2012 06:26 AM, Amos Kong wrote:
> On Sun, Jul 22, 2012 at 10:59 PM, Sheldon <shaohef@linux.vnet.ibm.com> wrote:
>>
>> (qemu) migrate -d exec:cat>/tmp/vm.out
>> .... -incoming fd:</tmp/vm.out
>>
>> thank you. it can work now.
>> there are still some questions.
>> 1. the migration file vm.out is a QEMU suspend to disk image.
>> How can I reboot vm.out by QEMU?
>
> Load the suspend vm.out by  # qemu-kvm .... incoming fd</tmp/vm.out,
> and execute monitor cmd to reboot  # system_reset.
> Then re-dump VM to disk by (qemu) migrate -d exec:cat>/tmp/vm.out2
>
> Is it satisfied for you?
Thank for your patience.

Load the suspend vm.out by  # qemu-kvm .... incoming fd</tmp/vm.out,

Actual, I have not do it successfully.  For I can not load the suspend 
vm.out, the hmp terminal report "load of migration failed"

When "migrate" with -b option (full copy of disk), the suspend vm.out 
will copy the source image.
So if I Load the suspend vm.out, does the qemu need the source image?

>
>> 2. I execute "migrate" with -b option, seems that the "migrate" runs
>> at background.
>> I cat get the "migrate" information by qmp , there is a { "execute":
>> "query-migrate" } command in qmp-command.
>
>> But I can not get the the "migrate" information by hmp, there is not
>> a "query-migrate" command in hmp-command.
> (qemu) info migrate
>
> info commands(for hmp) always correspond with query commands(for qmp),
> some query-cmds are not implemented right now (eg. query-network)
>
>
> hmp            qmp
> ---            ---
> info status -> query-status
> info block  -> query-block
> info pci    -> query-pci
> ....
got it. Thank you again.



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