Re: [Qemu-devel] [RFC] Disk integrity in QEMU

[Anthony Liguori]

Jamie Lokier wrote:
> Dor Laor wrote:
>   
> > Actually this is what happens on mainline qemu with cache=off.
> >     
>
> Have I understood right that cache=off on a qcow2 image only uses
> O_DIRECT for the leaf image, and the chain of base images don't use
> O_DIRECT?
>   

Yeah, that's a bug IMHO and in my patch to add O_DSYNC, I fix that.  I 
think an argument for O_DIRECT in a leaf and wb in the leaf is seriously 
flawed...

Regards,

Anthony Liguori

> Sometimes on a memory constrained host, where the (collective) guest
> memory is nearly as big as the host memory, I'm not sure this is what
> I want.
>
> -- Jamie
>
>
>