Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, I'm trying to take a production system, and create a hot-spare - using DRBD and Xen live migration. Pretty much all of the documentation I've seen talks about starting with two bare-iron boxes, and setting up a replicated environment. What I haven't seen is any guidance on whether one can "insert" DRBD into a production environment (presumably with a reboot somewhere in there), and then have a backup machine sync to the existing one. Our current production system is pretty much vanilla Debian, with servers on top of it. What I'm envisioning is a sequence something like: - set up a Dom0 and DomU on the new machine - install the O/S, servers, and application code into the new DomU --- build this with the DRBD driver installed, but not replicating anywhere (is this doable?) - take the old machine down - set up the new machine with all the old IP addresses and such - copy all the user-level data to the new environment - bring up the new environment -- with the DomU essentially looking just like the old environment - rebuild the original machine with Xen and DRBD installed - this becomes the backup machine - do something to have DRBD copy the new DomU production environment to the backup machine - enable live migration Has anybody done something like this? Can you offer any guidance and/or pointers to HOW-TO writeups? Thank you very much, Miles Fidelman -- In theory, there is no difference between theory and practice. In<fnord> practice, there is. .... Yogi Berra