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Re: [libvirt] Google Summer of Code 2013 ideas wiki open



On Mon, Apr 15, 2013 at 10:43:22AM +0800, harryxiyou wrote:
> On Fri, Apr 12, 2013 at 11:29 PM, Stefan Hajnoczi <stefanha gmail com> wrote:
> > On Fri, Apr 12, 2013 at 10:58 AM, Daniel P. Berrange
> > <berrange redhat com> wrote:
> >> On Fri, Apr 12, 2013 at 08:34:18AM +0200, Michal Privoznik wrote:
> >>> On 10.04.2013 15:13, harryxiyou wrote:
> >>> >
> >>> > Hi all,
> >>> >
> >>> > I've also got some ideas like following for GSOC 2013.
> >>> >
> >>> > Storage driver jobs.
> >>> >
> >>> > Currently, there is no Libvirt storage API to rename storage volume,
> >>> > storage pool, snapshot, etc. There is also no Libvirt API to move
> >>> > volume from one pool to another using libvirt API. Possibly those
> >>> > pools could have different backend (lvm, dir, ...). So i wanna finish
> >>> > these jobs for Libvirt during GSOC 2013. See following in details.
> >>> >
> >>> >
> >>> > 1, Rename storage volume. I will develop ' virsh vol-rename xxx'
> >>> > option for virsh tool.
> >>> >
> >>> > 2, Rename storage pool. I will develop 'virsh pool-rename xxx'
> >>> > option for virsh tool.
> >>> >
> >>> > 3, Rename snapshot. I will develop 'virsh snapshot-rename xxx'
> >>> > option for virsh tool.
> >>>
> >>> I am not sure we want *rename virsh commands. Not only for storage, but
> >>> in general. And even if we do want these, they don't require a new API.
> >>> They can be implemented with simple vir*GetXML(); vir*Define();
> >>> vir*Undefine();
> >>
> >> Actually I disagree - I think you want explicit APIs for renames, so that
> >> it can be done atomically / with minimal risk of failure halfway.
> >>
> >>> >
> >>> > 4, Move volume from one pool to another. I will develop 'virsh vol-move xxx'
> >>> > option for virsh tool.
> >>>
> >>> This one makes more sense, however I am worried about difficulty a bit.
> >>> A GSoC project should take 3 months for a student to complete. This is
> >>> something that even unexperienced user can accomplish in less than a month.
> >>
> >> Isn't all the libvirt functionality for this already existing? it it
> >> is basically just  virStorageVolCreateFrom(...original vol) and then
> >> delete the original volume.
> >
> > Michal said earlier that virsh vol-move seemed too small a task.
> >
> > Do you think that these 4 tasks together merit a 12-week project?
> >
> 
> Let me give a summary about my ideas for Libvirt of GSOC 2013.
> 
> Libvirt storage jobs.
> 
> This project includes renaming storage volume(storage pool, snapshot,etc),
> moving volume from one pool to another, the capability support for storage
> driver (like virsh capabilities for the hypervisor drivers, e.g. what pool types
> it supports, what volume types each pool type supports, even may what
> operations/APIs the pool type support, ...etc).

I'm not hugely comfortable with the idea of "capability support" being
done by a student. IMHO to do a good job on that design-wise requires
someone with a very good understanding of libvirt architecture & application
needs.


Daniel
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