Re: [Qemu-devel] Re: Strategic decision: COW format

[Avi Kivity]

On 02/23/2011 04:23 PM, Anthony Liguori wrote:
> On 02/23/2011 07:43 AM, Avi Kivity wrote:
> > On 02/22/2011 10:56 AM, Kevin Wolf wrote:
> > > *sigh*
> > >
> > > It starts to get annoying, but if you really insist, I can repeat it
> > > once more: These features that you don't need (this is the correct
> > > description for what you call "misfeatures") _are_ implemented in a way
> > > that they don't impact the "normal" case. And they are it today.
> >
> > Plus, encryption and snapshots can be implemented in a way that 
> > doesn't impact performance more than is reasonable.
>
> We're still missing the existence proof of this, but even assuming it 
> existed,

dm-crypt isn't any more complicated, and it's used by default in most 
distributions these days.

> what about snapshots?  Are we okay having a feature in a prominent 
> format that isn't going to meet user's expectations?
>
> Is there any hope that an image with 1000, 1000, or 10000 snapshots is 
> going to have even reasonable performance in qcow2?

Are thousands of snapshots for a single image a reasonable user 
expectation?  What's the use case?

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