For someone who meets the same problem. I upgrade stein to w, use one centos stream 8 vm as ctrl, and one centos stream 8 server as cn, then test it. There is no problem with attaching disks. All disks are attached correctly. But we do not know what's the problem with stein. If someone meets the problem, you can update your openstack. Jaze Lee <jazeltq(a)gmail.com&gt; 于2021年10月12日周二 上午9:20写道： > Andrea Bolognani <abologna(a)redhat.com&gt; 于2021年10月12日周二 上午12:07写道： > > On Fri, Oct 08, 2021 at 04:54:37PM +0800, Jaze Lee wrote: > > > Hello, > > > We run Openstack Stein on arm. It runs nova-compute(use libvirt > > > as virt driver) on arm host. We found when built with disks (use ceph > > > rbd) on arm hosts, the vm can not attach all disk correctly. For > > > example, built with six disks, the vm may attach three disks. No > > > obvious error can be fond in nova-compute, libvirt. We compare aarch64 > > > and x86, find when detach disk, the dmesg of the vm's os is different. > > > May be the pciehg parameter is different? > > > > > > Did anyone met the problem? Or some suggestions? > > > > I think you might have just ran out of PCI ports available for > > hotplug. Please try setting > > > > https://docs.openstack.org/nova/stein/configuration/config.html#libvirt.n... > > > > to a reasonable value and see whether that helps. > > Thanks. > I already set the value to a reasonable value. It is 15 in our environment. > If the value is not set correctly, the nova-compute will complain no > available slot for pci device. > But it is not the case I talked about here.