Re: [Qemu-devel] Image streaming and live block copy

[Avi Kivity]

On 06/16/2011 03:35 PM, Kevin Wolf wrote:
> * Image streaming is a normal image file plus copy-on-read plus a
> background task that copies data from the source image

Or a block-mirror started in degraded mode.

> * Live block copy is a block-mirror of two normal image files plus a
> background task that copies data from the source image

= block-mirror started in degraded mode

> The right solution is probably to implement COR and the background task
> in generic block layer code (no reason to restrict it to QED) and use it
> for both image streaming and live block copy. (This is a bit more
> complicated than it may sound here because guest writes must always take
> precedence over a copy - but doing complicated things is an even better
> reason to do it in a common place instead of duplicating)

Or in a block-mirror block format driver - generic code need not be 
involved.


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