Re: [Xen-API] VDI import/export with deltas

[Olivier Lambert <lambert.olivier@xxxxxxxxx>]

FYI, we'll also provide a way to do that kind of export in the local
file-system of Xen Orchestra Appliance.

On Thu, Aug 28, 2014 at 6:09 PM, Dave Scott <Dave.Scott@xxxxxxxxxx> wrote:
>
> On 28 Aug 2014, at 15:50, Bob Ball <bob.ball@xxxxxxxxxx> wrote:
>
>>> http://wiki.xensource.com/wiki/Disk_import/export_APIs
>>
>> This is great, but I think we're missing the ability to pull a VHD in or 
>> push a VHD out.
>>
>> The OpenStack case needs to call a vm-import giving a URL to pull a VHD 
>> from, and a vm-export to push a VHD out to.
>> In particular I think we need to set specific headers as well, as 
>> authentication, so I'd like to propose the following as a hopefully simple 
>> extension:
>>
>> xe vdi-export uuid=$VDI format=vhd dest=http://192.168.0.1:5000/... 
>> headers:arbitrary_string=$AUTH_TOKEN
>>
>> xe vdi-import uuid=$RESTORE format=vhd source=http://192.168.0.1:5000/... 
>> headers:arbitrary_string=$AUTH_TOKEN
>
> This looks sensible to me; plus Iâd like to use URLs more in the storage 
> interface in future.
>
>>
>> OpenStack also has a case for using bittorrent to download the VDI from 
>> peers rather than the central server, but I don't see how to accomplish that 
>> with the current proposal without requiring double the disk space as we'd 
>> need to download it then push it into XS.
>
> So at the moment, do you receive the .vhd data by bittorrent in-place?
>
> When I last spoke to John about this we discussed some kind of import/export 
> plugin extension. I guess to do the most efficient thing possible it would 
> have to have access to (at least a subset of) the physical storage, so it can 
> âdrop inâ a vhd (or qcow or vmdk). Ideally the plugin wouldnât see anything 
> else (so it couldnât get confused or make a mistake) and the modified files 
> would be health-checked when the operation is finished.
>
>> Thoughts?
>
> Maybe we could make a safe import/export virtual filesystem with FUSE? 
> Perhaps you could even SMB export a virtual folder for XenCenter users on 
> windows to drag ân drop files into.
>
> Cheers,
> Dave
>
>>
>> Thanks,
>>
>> Bob
>>
>>> There's still time before 2.0 to change how these work, so your comments
>>> and criticism would be appreciated.
>>>
>>> Thanks!
>>> Dave
>>>
>>> [1] https://github.com/xapi-project/xapi-project/issues/1
>>> [2] https://github.com/xapi-project/xen-api/issues/1778
>>> [3] https://github.com/xapi-project/vhd-tool/pull/14
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>
>
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