Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello, On 12/15/2011 06:55 PM, Trey Dockendorf wrote: > > On Dec 15, 2011 10:22 AM, "Felix Frank" <ff at mpexnet.de > <mailto:ff at mpexnet.de>> wrote: >> >> Hi, >> >> On 12/15/2011 05:09 PM, Trey Dockendorf wrote: >> > Thanks for the input. Your right in that 2 days is too little time to >> > do this, so I'm going to manual route of shutting one server down at a >> > time, migrating the virtual disks then bringing it back up on the remote >> > site. >> >> I had thought the QCow images were on one disk. If there are indeed >> several disks you can sync, yes, you can take that route. >> >> > To avoid more downtime of manual migration once this is all over with, I >> > think I will first attempt just getting a DRBD resource up and running >> > to sync my servers back to the primary datacenter. Can a DRBD resource >> > on an existing LVM be done without effecting the data ? Also since I >> >> Yes, provided you can a) enlarge the LV a bit to use internal meta data >> or b) have some extra space on both machines to create an external meta >> data disk. >> >> > don't plain to have automatic failover, any precautions I should take if >> > the network connection is lost between the two datacenters ? Ideally >> > this would allow me to have minimal downtime while the nodes re-sync. >> >> Resyncing does not require downtime. Migrating the VMs to the other DRBD >> peer needs downtime, and it's always brief. >> >> I cannot think of any required precautions. >> >> So the actual plan is to migrate the VMs before the connection is lost? >> Great, this way you get away with an (arbitrarily long) quicksync once >> the link returns and once that's finished, you can migrate back at your >> leisure. >> >> Cheers, >> Felix > > All the qcow images are in pools located on the same logical volume. > > Your correct. The plan is to migrate before the fiber repair and > network outage then sync them back with DRBD. > > The meta space, does it have to be stored separate from the replicated > LVM? I have a few 100 GBs left on that device. meta-data is located at the end of a device (internal) or on an extra device. About 32MB per 1TB is needed ... exact calculation: http://www.drbd.org/users-guide/ch-internals.html#s-meta-data-size Regards, Andreas -- Need help with DRBD? http://www.hastexo.com/now > > Thanks > - Trey > > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 286 bytes Desc: OpenPGP digital signature URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20111215/917de9a3/attachment.pgp>