Re: [Libguestfs] [Qemu-devel] How to emulate block I/O timeout on qemu side?
On 11/06/2018 01:49 AM, Eric Blake wrote:
On 11/2/18 3:11 AM, Dongli Zhang wrote:
> Hi,
>
> Is there any way to emulate I/O timeout on qemu side (not fault injection in VM
> kernel) without modifying qemu source code?
You may be interested in Rich's work on nbdkit. If you don't mind the overhead
of the host connecting through NBD, then you can use nbdkit's delay and
fault-injection filters for inserting delays or even run-time-controllable
failures to investigate how the guest reacts to those situations
Thank you all very much for the suggestions. I will take a look on nbdkit.
So far I am reproducing the issue with NFS (by shutdown the link to NFS where
the image is placed on purpose) but it did not work well.
>
> For instance, I would like to observe/study/debug the I/O timeout handling of
> nvme, scsi, virtio-blk (not supported) of VM kernel.
>
> Is there a way to trigger this on purpose on qemu side?
>
> Thank you very much!
>
> Dongli Zhang
>
>
Dongli Zhang