[Openstack-operators] Grizzly: live-migration with attached volume?

Stephen Cousins steve.cousins at maine.edu
Fri Sep 12 21:04:37 UTC 2014

Just confirmed that it isn't happening with 4-core VM's either. Just 8. I
haven't tried a 16-core VM but I can guess.

The flavors are matched with 1 GB per core so an 8-core VM has 8 GB of RAM.
Does that lead to any ideas?

On Fri, Sep 12, 2014 at 3:10 PM, Stephen Cousins <steve.cousins at maine.edu>

> Thanks for the information. I just tried doing it with a VM with only 2
> cores and it has been working fine. So it seems that it may be specific to
> the number of cores that are involved. I'll try with 4 to see if that works
> ok.  Thankfully we don't have many 8-core machines but we still have the
> need to migrate them for maintenance.
> Does this core-specific information help to figure out what the problem is?
> On Fri, Sep 12, 2014 at 2:31 PM, Jonathan Proulx <jon at jonproulx.com>
> wrote:
>> On Fri, Sep 12, 2014 at 1:44 PM, Stephen Cousins
>> <steve.cousins at maine.edu> wrote:
>> > Does anyone live-migrate VM's successfully when volumes are attached?
>> My setup is significantly different so probably not terribly helpful,
>> but to answer the question I did do live migrations with Volumes
>> attached on my Grizzly cloud (since upgraded to Icehouse).  We don't
>> have shared storage for the ephemeral disks and our Volumes are iSCSI
>> attached (from an equallogic san), so something like:
>> nova live-migration --block-migrate <server> [<host>]
>> I wouldn't say it was 100% but the volume piece wasn't a problem. Well
>> once I figured out in my case I needed to flip some bits on the SAN
>> side to allow multiple logins to the same target as source and
>> destination are both connected during a migration, but I wouldn't
>> expect that to be an issue with NFS
>> -Jon

 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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