[ovirt-devel] Snapshots & clone support from datastore

[Yaniv Lavi (Dary)]

Hi,
You can have a look at the libfgapi patches as the are the first to
externalize the snapshot process to separate implementation.


Thanks,

YANIV LAVI (YANIV DARY)

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On Wed, Jun 21, 2017 at 11:57 PM, Deepak Jagtap <deepak.jagtap at maxta.com>
wrote:

> Thanks Yaniv!
> ------------------------------
> *From:* Yaniv Kaul <ykaul at redhat.com>
> *Sent:* Wednesday, June 21, 2017 1:47:26 PM
> *To:* Deepak Jagtap
> *Cc:* Allon Mureinik; devel at ovirt.org
>
> *Subject:* Re: [ovirt-devel] Snapshots & clone support from datastore
>
>
>
> On Wed, Jun 21, 2017 at 10:28 PM, Deepak Jagtap <deepak.jagtap at maxta.com>
> wrote:
>
>> Hi Allon,
>>
>>
>> I am trying to leverage snapshot  capability of underlying filesystem.
>>
>> As per my understanding current snapshot works like this:
>>
>> Base Image(raw)--->snap1(qcow)->snap2(qcow), i.e after each snapshot vm
>> starts writing on newly created qcow image.
>>
>> So in this case vm is going to do all new writes on snap2(qcow) voulme
>> and will redirect read IOs to snap1 & Base image as required.
>>
>>
>> But in my case snapshots created by the filesystem are read only and it's
>> in raw format.
>>
>> As a result after creating snapshot vm disk configuration won't change
>> after taking snapshot but will continue doing writes on same base image.
>>
>> So snapshots will look like this:
>>
>> Base Image(raw)--->snap1(raw)->snap2(raw)
>>
>> Base Image will always remain writable, while the snapshots will remain
>> read only raw format.
>>
>>
>> Just wanted to confirm is this configurable so that vm continues
>>  referring base image after the snapshot instead of newly created qcow
>> image?
>>
>
> It is not. It'll need code modification to allow externally taking
> snapshots of VM disks.
> Y.
>
>
>>
>> Thanks & Regards,
>>
>> Deepak
>>
>>
>>
>>
>>
>> ------------------------------
>> *From:* Allon Mureinik <amureini at redhat.com>
>> *Sent:* Tuesday, June 20, 2017 7:59:03 PM
>>
>> *To:* Deepak Jagtap
>> *Cc:* devel at ovirt.org
>> *Subject:* Re: [ovirt-devel] Snapshots & clone support from datastore
>>
>> Not sure I understand the question. Could you give an example of what you
>> mean perhpas?
>>
>> On Tue, Jun 20, 2017 at 10:01 PM, Deepak Jagtap <deepak.jagtap at maxta.com>
>> wrote:
>>
>>> Hi Allon,
>>>
>>>
>>> After going through current vdsm code base, noticed that after taking a
>>> snapshot vm starts referring the newly created qcow image/volume.
>>>
>>> For internal snapshots which are not qcow  is it configurable somehow so
>>> that vm continues doing writes to same base image?
>>>
>>>
>>> Thanks & Regards,
>>>
>>> Deepak
>>> ------------------------------
>>> *From:* Deepak Jagtap
>>> *Sent:* Tuesday, June 6, 2017 3:37:03 PM
>>> *To:* Allon Mureinik
>>> *Cc:* devel at ovirt.org
>>> *Subject:* Re: [ovirt-devel] Snapshots & clone support from datastore
>>>
>>>
>>> Thanks Allon!
>>>
>>>
>>> Best Regards,
>>>
>>> Deepak
>>> ------------------------------
>>> *From:* Allon Mureinik <amureini at redhat.com>
>>> *Sent:* Tuesday, June 6, 2017 2:43:17 PM
>>> *To:* Deepak Jagtap
>>> *Cc:* devel at ovirt.org
>>> *Subject:* Re: [ovirt-devel] Snapshots & clone support from datastore
>>>
>>> Unfortunately, there's no such integration point at the moment.
>>>
>>> On Tue, Jun 6, 2017 at 5:57 AM, Deepak Jagtap <deepak.jagtap at maxta.com>
>>> wrote:
>>>
>>>> Hey Guys,
>>>>
>>>>
>>>> I am newbie to ovirt, and wanted to confirm whats the best way to
>>>> leverage snapshot, clone features
>>>>
>>>> provided by the datastore filesystem.
>>>>
>>>> I have a btrfs datastore exported and wanted use btrfs snapshots for vm
>>>> snapshot & clones.
>>>>
>>>> Does ovirt offers any hooks/APIs so that image snapshots are created by
>>>> the filesystem?
>>>>
>>>>
>>>> Thanks & Regards,
>>>>
>>>> Deepak
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Devel mailing list
>>>> Devel at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/devel
>>>>
>>>
>>>
>>
>> _______________________________________________
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>>
>
>
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