[sheepdog-users] 0.7.5 and older qemu?

[Gerald Richter - ECOS]

Hi,

thanks for your feedback. I don't need erasure coding (yet), but I am not sure what you mean by online snapshots and I didn't find anything on the net. Does this making a snapshot of a running vm? I though this is already possible with older versions or does it mean something different?

Regards

Gerald

> -----Ursprüngliche Nachricht-----
> Von: Liu Yuan [mailto:namei.unix at gmail.com]
> Gesendet: Freitag, 22. November 2013 07:35
> An: Gerald Richter
> Cc: sheepdog-users at lists.wpkg.org
> Betreff: Re: [sheepdog-users] 0.7.5 and older qemu?
> 
> On Fri, Nov 22, 2013 at 07:15:14AM +0100, Gerald Richter - ECOS wrote:
> >
> >
> > Hi,
> >
> >
> > my distribution comes with sheepdog 0.6. I want to upgrade to 0.7.5 , but I
> don’t want upgrade qemu as well. So is there any issue using 0.7.5 for the
> sheepdog daemon, but use an older qemu (which has of cause sheepdog
> support build in)?
> 
> In pratice, higher version of sheepdog can work with lower version of QEMU.
> We meticulously take care of backward compatibility issues for every release.
> So yes for your question. But old qemu can't support new functionalities such
> as online snapshot, erasure code, etc and probably with known bugs in its
> sheepdog driver.
> 
> Official v1.7 of QEMU will include online disk snapshot of sheepdog, but
> there are several sheepdog patches that enable fully erasure code support
> pending in the development tree of QEMU.
> 
> After v1.7 of QEMU release, we'll provide a patches source with the
> combination of stable v1.7 + sheepdog pending patches. I'd suggest you
> consider this combo version for production if you desire erasure code +
> online disk support.
> 
> >
> > 0.7.5 is marked as stable. Does this mean it is really ready for production
> use and it is safe to use it for real data?
> 
> Yes, actually there are some users use this stable-branch in production. But
> the next v0.8 will be released soon(in weeks), which support erasure code,
> better snapshot object reclaiming after deletion, etc. We change some
> layout for v0.8 release, which means it won't be compatible with v0.7 series.
> 
> Thanks
> Yuan
> >
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> 
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