Re: [Qemu-devel] Live migration using qcow2

[Dietmar Maurer]

> The problem is about cache coherency. Local files work just fine with
> cache=writeback, but if you migrate to a different host, you get the problem
> that the destination kernel may cache some parts of the image while the source
> is still writing to it. When you do the actual switch to the destination host 
> and
> the backend doesn't take care of invalidating that cache, you might 
> (partially)
> read outdated data.

Isn't there a way to force a cache flush?