[Users] [SPF:fail] Re: [SPF:fail] online migration failure

Todd Lyons tlyons at ivenue.com
Mon Jul 22 10:18:44 EDT 2013


On Mon, Jul 22, 2013 at 12:22 AM, Roman Haefeli <reduzent at gmail.com> wrote:
> On Fri, 2013-07-12 at 08:20 -0700, Todd Lyons wrote:
>> > CTs with layout simfs on NFS can sometimes not be live migrated. The
>> Active NFS traffic at the time of migration is a problem.  I've had
>> containers migrate just fine when serving no load, but once you start
>> serving traffic, then live migrations hang in really weird states
> The problem here seems not related to load,  but to the fact that files
> have been in use on the migration source which cannot be restored at the
> migration target. .nfsXXXXXXX-files are only exported to the NFS client
> who actually deleted the original file.

>> Kir
>> said there was some work occurring that would help openvz deal with
>> active NFS during a migration, but I do not know the state of that
>> work.
> I wonder if it is possible for the OpenVZ devs to fix/workaround such a
> situation and whether they are going to do it.

I may not have stated it clearly enough above.  When I said "serving
traffic", I was implying having open files.  The issue is in the way
nfs uses rpc to map open files.  The OVZ fix/workaround that you
pondered is exactly what they (unknown to me someones) are working on.

...Todd
--
The total budget at all receivers for solving senders' problems is $0.
 If you want them to accept your mail and manage it the way you want,
send it the way the spec says to. --John Levine


More information about the Users mailing list