[Openstack-operators] Grizzly: live-migration with attached volume?
steve.cousins at maine.edu
Fri Sep 12 17:44:19 UTC 2014
Yes, it is the instance load. The console.log seems to get truncated to 0
bytes whenever I do live-migration. All machines (including the nfs server)
are using ntp. I just checked visually and all of their times match, at
least to the second. Probably it is closer.
I can't find much in the logs.
Does anyone live-migrate VM's successfully when volumes are attached?
On Fri, Sep 12, 2014 at 1:17 PM, Abel Lopez <alopgeek at gmail.com> wrote:
> That’s pretty interesting. I haven’t seen that before, tbh, I had been
> using gridcentric for live migrations in grizzly, but that’s just because
> we didn’t have shared storage.
> So, the instance is what is generating the load, right? anything
> interesting on the console log? I wonder if there is some time-sync issue
> that’s going haywire when it lands on the new host.
> But now I’m just speculating.
> On Sep 12, 2014, at 10:13 AM, Stephen Cousins <steve.cousins at maine.edu>
> Hi Abel,
> I just tried and it did the same thing. Load went up to 800 and the VM is
> Any ideas?
> On Fri, Sep 12, 2014 at 12:59 PM, Abel Lopez <alopgeek at gmail.com> wrote:
>> Does it work if you first detach the volume and then migrate?
>> On Friday, September 12, 2014, Stephen Cousins <steve.cousins at maine.edu>
>>> I am fairly new to Openstack having just inherited a Grizzly system with
>>> NFS storage. "nova live-migration" is working unless the VM has an attached
>>> volume. When it doesn't work, the VM does move but it is not possible to
>>> connect to it and the CPU load on that VM goes up to the number of cores
>>> assigned to it. That is, for a VM with 8 cores in it, the load for that
>>> qemu-system-x86_64 process goes up to about 800%. Is this a known problem
>>> with Grizzly?
>>> Here is a description of our system:
>>> three machines set up with HA for Quantum (with Open vSwitch),
>>> Cinder, RabbitMQ, and Nova. These nodes are all compute nodes too. We also
>>> have another machine that is just compute.
>>> Cinder and Glance storage is all NFS connected to each machine with the
>>> same mount points.
>>> The command I am using to do the migration is:
>>> nova live-migration $UUID compute3
>>> In some cases the migration has worked when a volume has been attached.
>>> Most of the time however, it does not work.
>>> Steve Cousins Supercomputer Engineer/Administrator
>>> Advanced Computing Group University of Maine System
>>> 244 Neville Hall (UMS Data Center) (207) 561-3574
>>> Orono ME 04469 steve.cousins at maine.edu
> Steve Cousins Supercomputer Engineer/Administrator
> Advanced Computing Group University of Maine System
> 244 Neville Hall (UMS Data Center) (207) 561-3574
> Orono ME 04469 steve.cousins at maine.edu
Steve Cousins Supercomputer Engineer/Administrator
Advanced Computing Group University of Maine System
244 Neville Hall (UMS Data Center) (207) 561-3574
Orono ME 04469 steve.cousins at maine.edu
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