Re: [Qemu-block] [Qemu-devel] I/O errors reported to guest for raw-image-file backed /dev/vda - but host sees no I/O errors

[Kevin Wolf]

Am 20.04.2016 um 04:11 hat Fam Zheng geschrieben:
> On Tue, 04/19 19:47, Lutz Vieweg wrote:
> > The guest drive parameters are:
> > > -drive 
> > > "file=image.raw,if=virtio,format=raw,media=disk,cache=unsafe,werror=report,rerror=report"
> 
> Given this implies aio=threads...
> 
> > Can you provide any hint on how to pursue the cause of these errors?
> > (I thought about using "strace -f -p ..." on qemu, but I don't
> > know what exactly to look for in the output - some failed "pwrite()"
> > to the image file?)
> 
> ... yes, this should work.

To catch all possible write failures, I think pwrite, pwritev and
possibly fdatasync need to be considered.

Kevin