On 21/04/2015 11:53, Konstantin Krotov wrote: >> Can you detail the problem more? That could be a kernel bug. > > I connect to the host system, two storage systems as block devices. Both > block devices combine md-raid1. md-device use as disk for virtual > machine. If i use io=native, read perform only from one of two raid1 > legs. I'd like to distribute the load reading between two raid1 legs, > but md-raid1 implementation it does only if set io=thread.
That looks like a kernel problem. Paolo
