Re: [Qemu-devel] Re: [PATCH][v2] Align file accesses with cache=off (O_DIRECT)

[Paul Brook]

> When sector-aligned guest offsets are converted to sector-unaligned
> writes (e.g. due to qcow2 etc.), that property is no longer satisfied,
> and power failure of the host disk can cause more damage than the
> guest is designed to be resistant to.

Seems like the easiest solution would be to have qcow always align its writes.
We don't do on the fly compression, so it should be fairly easy to make this 
happen with minimal overhead.

Paul