Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Mon, Feb 16, 2009 at 01:19:26PM +0100, Heiko wrote: > On Mon, Feb 16, 2009 at 10:58 AM, Heiko <rupertt at gmail.com> wrote: > > Hello, > > > > we have one XEN VM that is running on a lvm device, replicated with > > drbd between 2 machines and we > > now need to move this setup to another pair of machines, What is the > > best way to do this? > > The new setup will have the same paramteter than the old one, 10GB LVM device. > > > > > I missed to give some infos, > all the hosts run on Centos 5.2, drbd ist 8.0.13-1, xen is 3.1. > Would this transfer work with an simple dd of the drbd device? yes, but only if you quiescen it before you start the dd. downtime, obviously. > Is there a way to get nearly zero downtime by adding one of the new > server to the existing cluster, > than remove both old ones and add the second new server? > Has this be done before and how would look the complete procedure? I'd probably replace the current secondary with one of the new nodes, do a _full_ sync, then switch over, and replace the other node. depending on how much data this is about, I'd even consider taking one old node down, and plugging its backend storage into one of the new ones you only need a partial sync in this case, just those blocks that changed since you took the old node down. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. __ please don't Cc me, but send to list -- I'm subscribed