Re: [Xen-users] drbd 8 primary/primary and xen migration on RHEL 5

[nathan@xxxxxxxxxxxx]

On Thu, 31 Jul 2008, Antibozo wrote:

> On 2008-07-31 23:24, Antibozo wrote:
> > On 2008-07-31 21:58, nathan@xxxxxxxxxxxx wrote:
> > > I am running DRBD primary/primary on Centos 5.2 with CLVM and GFS with no 
> > > problems. The only issue I have with live migration is that the arp takes 
> > > 10 - 15 sec to get refreshed so you lose connectivity during that time. I 
> > > have the problem with 3.0ish xen on Centos 5.2 as well as xen 3.2.1.
> > One can run a job on the vm to generate a packet every second or two to 
> > resolve this; ping in a loop should do it.
> Quick follow-up:
>
> arping -b -A *ip-address-of-vm*
>
> seems to work pretty well. I get a 2-3 second dropout if I'm running this 
> during live migration.
Odd, I am seeing 15 - 20 sec, how on earth does someone get 165ms that is 
talked about? I get the same delay if I am migrating over gig e or 20 gig 
infiniband. It also should not be my I/O subsystem as I am getting 400 MB 
writes and 550 MB reads.
> <>
Nathan Stratton                                CTO, BlinkMind, Inc.
nathan at robotics.net                         nathan at blinkmind.com
http://www.robotics.net                        http://www.blinkmind.com

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