Re: qemu-1.7.0 and internal snapshot, Was: qemu-1.5.0 savevm error -95 while writing vm with ceph-rbd as storage-backend

[Oliver Francke <Oliver.Francke@filoo.de>]

Hi Wido,

On 12/20/2013 08:06 AM, Wido den Hollander wrote:
> On 12/17/2013 05:07 PM, Oliver Francke wrote:
>> Hi Alexandre and Wido ;)
>>
>> well, I know this is a pretty old question... but saw some comments from
>> you Wido as well as a most current patch for qemu-1.7.0 in the
>> git.proxmox ( internal snapshot async port to qemu 1.7 v5)
>> What I currently did is: apply modify-query-machines.patch and
>> internal-snapshot-async.patch to qemu-1.7.0 sources, all hunks succeed.
>>
>> Now after talking to the QMP with:
>>
>>      { "execute" : "savevm-start", "arguments": { "statefile":
>> "rbd:123/905.save1" }}
>>
>> or a local file, it spits out:
>>
>>      qemu-system-x86_64: block.c:4430: bdrv_set_in_use: Assertion
>> `bs->in_use != in_use' failed
>>
>> *sigh*
>>
>> qemu is started with "some" parameters... and finally drive-specific 
>> ones:
>>
>> -device virtio-blk-pci,drive=virtio0 -drive
>> format=raw,file=rbd:123/vm-905-disk-.rbd:rbd_cache=true:rbd_cache_size=33554432:rbd_cache_max_dirty=16777216:rbd_cache_target_dirty=8388608,cache=writeback,if=none,id=virtio0,media=disk,index=0 
>>
>>
>>
>> Did I miss a relevant point?
>> What would be the correct strategy?
>>
>
> I haven't tested this recently, so I'm not sure if this should already 
> work.
>
> It would be great if this worked, but I'm not aware of it.

unfortunately I didn't give it a try the time Alexandre first mentioned 
it. This functionality should def make it into some next qemu-version.
If you get it to work with current 1.7.0 i would appreciate any more 
input ;)

Regards,

Oliver.

>
> Wido
>
>> Thnx in advance and kind regards,
>>
>> Oliver.
>>
>> P.S.: I don't use libvirt nor proxmox as a complete system.
>>
>> On 05/24/2013 10:57 PM, Oliver Francke wrote:
>>> Hi Alexandre,
>>>
>>> Am 24.05.2013 um 17:37 schrieb Alexandre DERUMIER 
>>> <aderumier@odiso.com>:
>>>
>>>> Hi,
>>>>
>>>> For Proxmox, we have made some patchs to split the savevm process,
>>>>
>>>> to be able to save the memory to an external volume. (and not the
>>>> current volume).
>>>>
>>>> For rbd, we create a new rbd volume to store the memory.
>>>>
>>>> qemu patch is here :
>>>> https://git.proxmox.com/?p=pve-qemu-kvm.git;a=blob;f=debian/patches/internal-snapshot-async.patch;h=c67a97ea497fe31ff449acb79e04dc1c53b25578;hb=HEAD 
>>>>
>>>>
>>>>
>>>> ----- Mail original -----
>>>>
>>> wow, sounds very interesting, being on the road for the next 3 days I
>>> will have a closer look next week.
>>>
>>> Thnx n regards,
>>>
>>> Oliver.
>>>
>>>> De: "Wido den Hollander" <wido@42on.com>
>>>> À: "Oliver Francke" <Oliver.Francke@filoo.de>
>>>> Cc: ceph-devel@vger.kernel.org
>>>> Envoyé: Vendredi 24 Mai 2013 17:08:35
>>>> Objet: Re: qemu-1.5.0 savevm error -95 while writing vm with ceph-rbd
>>>> as storage-backend
>>>>
>>>> On 05/24/2013 09:46 AM, Oliver Francke wrote:
>>>>> Hi,
>>>>>
>>>>> with a running VM I encounter this strange behaviour, former
>>>>> qemu-versions don't show up such an error.
>>>>> Perhaps this comes from the rbd-backend in qemu-1.5.0 in combination
>>>>> with ceph-0.56.6? Therefore my
>>>>> crosspost.
>>>>>
>>>>> Even if I have no real live-snapshot avail - they know of this
>>>>> restriction -, it's more work for the customers
>>>>> to perform a shutdown before the wonna do some changes to their VM ;)
>>>>>
>>>> Doesn't Qemu try to save the memory state to RBD here as well? That
>>>> doesn't work and fails.
>>>>
>>>>> Any hints welcome,
>>>>>
>>>>> Oliver.
>>>>>
>>>>
>>>> -- 
>>>> Wido den Hollander
>>>> 42on B.V.
>>>>
>>>> Phone: +31 (0)20 700 9902
>>>> Skype: contact42on
>>>> -- 
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>>
>>
>
>


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Oliver Francke

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