Re: [Qemu-devel] qemu-img problem when create a file larger than fs's size

[yuxh <yuxinghai@cn.fujitsu.com>]

On 05/09/2013 03:44 PM, Stefan Hajnoczi wrote:
> On Wed, May 08, 2013 at 01:18:17PM +0800, yuxh wrote:
>> I have to consult you a qemu-img's problem.
>>
>> Is this reasonable to create a file which is larger than the
>> available size of the fs by qemu-img cmd ?
>>
>> When I use qemu-img create a file which is larger than the available
>> size of the fs, the creation is completed succesfully.
>>
>> However when I use this file in guest as a guest's disk, and write
>> beyond the size the host file can provides, the guest was paused by
>> qemu-kvm or libvirt and was in maybe a infinite circle where the
>> guest just can't be used except I detach the disk from guest or
>> destroy the guest.
>
> You can change the ENOSPC policy with -drive werror=,rerror=.  See the
> QEMU man page.
>
> The default behavior is to pause the guest so the host admin can free up
> or add space.  Then the guest can be continued - this will retry the
> I/O.
>
> But you can also tell QEMU to pass the error through to the guest using
> the -drive werror=,rerror= options.
>
> Stefan
>
>

Oh, understand now.
Thank you so much for your explanation.

Yu