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, 08 Dec 2008 11:50:04 -0700, ha at buglecreek.com wrote: > I just found out that the Drbd-8.0.8 cluster OS that we have is End Of > Life in January (no patches etc). So we need to upgrade the OS. It > currently runs > Fedora Core 8 and we would like to go to RHEL5. The cluster is a > intranet server with mysql and also uses heartbeat, drbdlinks. The OS > is installed on /dev/sda and the drbd shared device is on it's on > hardisk (/dev/sdb) on both systems which has all the www, mysql data on > it. Is is possible to install a new OS on the backup system, set it up > with all the necessary server packages, install heartbeat, drbd and have > it use the existing sdb device. Then make the newly installed backup the > primary and do the same to the old primary? If so, any suggestions on > how to go about it? > Or do I have to start from scratch on these systems? > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user My initial thought on this is to treat the secondary node as a "node failure" as outlined in the documentation. So with that in mind I would do the following on the secondary node: 1. Stop Heartbeat - shutdown machine 2. Reload the new OS and applications (http server, mysql server, samba, drbdlinks etc) on /dev/sda as it is now. 3. Load drbd-8.0.14 and copy the drbd.conf from the primary node 4. I should NOT have to do any of the following since I did not touch the drbd device (/dev/sdb): drbdadm create-md resource drbdadm attach resource drbdadm connect resource 5. Start the newly upgraded machine- Should connect to the primary node and automatically start syncing. 6. Load heartbeat - setup and start. 7. Switch over to the newly upgraded node, verify working. 8. Do the same to the old primary (now acting as the standby). Of course, I am assuming that the primary would be able to be fully used during the time the the secondary is down for the upgrade. I would appreciate comments from those with more experience before I try this. Does this plan sound reasonable? Thanks