Hi Bart On 09/05/2018 11:48 PM, Bart Van Assche wrote: >> The 3rd patch apply the queue close in nvme-pci to avoid the IO hang >> issue above. > Hello Jianchao, > > Is this patch series based on a theoretical concern or rather on something > you ran into? In the latter case, can you explain which scenario makes it > likely on your setup to encounter an NVMe timeout? It is a theoretical concern. But I think it is very obvious. It could be very easy to reproduce if simulate IO timeout in software. Thanks Jianchao