[libvirt] virStorageVolCreateXMLFrom

[Cole Robinson]

Kenneth Nagin wrote:
> 
>> "Daniel P. Berrange" <berrange at redhat.com> wrote on 22/06/2009 12:08:39:
> 
>> On Mon, Jun 22, 2009 at 09:59:00AM +0300, Kenneth Nagin wrote:
>>> I'd like to get a better understanding of the
> virStorageVolCreateXMLFrom
>>> api Its name and signature imply that it is a cloning operation that
> copies
>>> a volume from one location to another. Is this correct?
>> Yes this method does a deep-copy of all the data, and can convert between
>> disk formats at the same time (eg raw -> qcow2, or any qemu-img format).
>>
>>> Does it support remote copy of non-shared storage, e.g. from a http
> server?
>> It only supports copying within the same storage pool at this time, and
>> we don't implement any storage pool based on http.
>>
>>> Is there any thought about adding digest validation check, e.g. with a
> md5
>>> digest?
>> What would that do ? Or rather what semantics would you want from such a
>> thing ?  I rather hope that just reading & writing a local file would
>> not result in data corruption.
> My question was in the context of supporting remote copy (see above).
> The digest validation would only be necessary if you supported remote copy.
> 

CreateXMLFrom does not facilitate copying storage from one machine to
another, it only works on a single connection/host. This host can be
remote though.

- Cole