Curtis, Do you have enough space to run tcpdump (port not 22) on both hosts and on the small VM you have done previously - and then start the migration? Best Regards, Strahil NikolovOn Aug 24, 2019 22:15, "Curtis E. Combs Jr." <ej.albany(a)gmail.com&gt; wrote: > > I applied a 90Mbs QOS Rate Limit with 10 set for the shares to both > interfaces of 2 of the hosts. My hosts names are swm-01 and swm-02. > > Creating a small VM from a Cinder template and running it gave me a test VM. > > When I migrated from swm-01 to swm-02, swm-01 immediately became > unresponsive to pings, SSH'es, and to the ovirt interface which marked > it as "NonResponsive" soon after the VM finished. The VM did finish > migrating, however I'm unsure if that's a good migration or not. > > Thank you, Strahil. > > On Sat, Aug 24, 2019 at 12:39 PM Strahil <hunter86_bg(a)yahoo.com&gt; wrote: > > > > What is your bandwidth threshold for the network used for VM migration ? > > Can you set a 90 mbit/s threshold (yes, less than 100mbit/s) and try to migrate a small (1 GB RAM) VM ? > > > > Do you see disconnects ? > > > > If no, try a little bit up (the threshold)  and check again. > > > > Best Regards, > > Strahil NikolovOn Aug 23, 2019 23:19, "Curtis E. Combs Jr." <ej.albany(a)gmail.com&gt; wrote: > > > > > > It took a while for my servers to come back on the network this time. > > > I think it's due to ovirt continuing to try to migrate the VMs around > > > like I requested. The 3 servers' names are "swm-01, swm-02 and > > > swm-03". Eventually (about 2-3 minutes ago) they all came back online. > > > > > > So I disabled and stopped the lldpad service. > > > > > > Nope. Started some more migrations and swm-02 and swm-03 disappeared > > > again. No ping, SSH hung, same as before - almost as soon as the > > > migration started. > > > > > > If you wall have any ideas what switch-level setting might be enabled, > > > let me know, cause I'm stumped. I can add it to the ticket that's > > > requesting the port configurations. I've already added the port > > > numbers and switch name that I got from CDP. > > > > > > Thanks again, I really appreciate the help! > > > cecjr > > > > > > > > > > > > On Fri, Aug 23, 2019 at 3:28 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: > > > > > > > > > > > > > > > > On Fri, Aug 23, 2019 at 9:19 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: > > > >> > > > >> > > > >> > > > >> On Fri, Aug 23, 2019 at 8:03 PM Curtis E. Combs Jr. <ej.albany(a)gmail.com&gt; wrote: > > > >>> > > > >>> This little cluster isn't in production or anything like that yet. > > > >>> > > > >>> So, I went ahead and used your ethtool commands to disable pause > > > >>> frames on both interfaces of each server. I then, chose a few VMs to > > > >>> migrate around at random. > > > >>> > > > >>> swm-02 and swm-03 both went out again. Unreachable. Can't ping, can't > > > >>> ssh, and the SSH session that I had open was unresponsive. > > > >>> > > > >>> Any other ideas? > > > >>> > > > >> > > > >> Sorry, no. Looks like two different NICs with different drivers and frimware goes down together. > > > >> This is a strong indication that the root cause is related to the switch. > > > >> Maybe you can get some information about the switch config by > > > >> 'lldptool get-tlv -n -i em1' > > > >> > > > > > > > > Another guess: > > > > After the optional 'lldptool get-tlv -n -i em1' > > > > 'systemctl stop lldpad' > > > > another try to migrate. > > > > > > > > > > > >> > > > >> > > > >>> > > > >>> On Fri, Aug 23, 2019 at 1:50 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: > > > >>> > > > > >>> > > > > >>> > > > > >>> > On Fri, Aug 23, 2019 at 6:45 PM Curtis E. Combs Jr. <ej.albany(a)gmail.com&gt; wrote: > > > >>> >> > > > >>> >> Unfortunately, I can't check on the switch. Trust me, I've tried. > > > >>> >> These servers are in a Co-Lo and I've put 5 tickets in asking about > > > >>> >> the port configuration. They just get ignored - but that's par for the > > > >>> >> coarse for IT here. Only about 2 out of 10 of our tickets get any > > > >>> >> response and usually the response doesn't help. Then