[dm-devel] multipath issue on kernel 4.6.2

[Jean-Philippe Methot]

Greetings,

I thought I would inform you of this issue I've had with multipathd 
under CentOS 7 on kernel 4.6.2. The idea is that we wanted to test 
kernel 4.6.2 for virtualization purposes, as apparently kernel 4 and up 
improves IO for KVM. When we boot on that kernel though, multipath keeps 
detecting and immediately losing the paths to our block devices, causing 
undelivered IO to accumulate (or so it looks like), the VM to become 
unresponsive and eventually, crashing the host.

This is the kernel package name we installed : 
kernel-ml-4.6.2-1.el7.elrepo.x86_64 .

Of course we've rolled back to kernel 3.10 since, so that our VMs can 
work properly, but I thought it would be a good idea to bring this issue 
to your attention.

Best regards,

Jean-Philippe Méthot