Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello, 2011/9/13 SlingPirate <sling.temp at googlemail.com>: > > Thank you for your input Lars, and apologies for my lack of understanding. I > have done some more reading and I am still somewhat unsure as how to approch > this. I will try to re-explain what I'm after and I would be grateful for > any more of your time and guidance. > > ********* On-site ********* *** Off-site *** > = NODE-1 = = NODE-2 = = NODE-DR = > = VM-1 = = VM-1 = = VM-1 = > = VM-2 = = VM-2 = = VM-2 = > = VM-3 = = VM-3 = = VM-3 = > = VM-4 = = VM-4 = = VM-4 = > > Under normal conditions I would like to run VM-1 & VM-2 on NODE-1 while VM-3 > & VM-4 run on NODE-2. > > If NODE-1 dies NODE-2 runs all the VMs or visa-versa. If the site that > NODE-1 & NODE-2 are based at blows up, NODE-3 is ready to run all VMs. > > I can use either block devices or image files for the VMs. > > What would you suggest would be the correct way to set this up? > You need more than one DRBD, for example: DRBD0 for VM-1 & VM-2, Primary on NODE-1, Secondary on NODE-2 DRBD1 for VM-3 & VM-4, Primary on NODE-2, Secondary on NODE-1 or use one DRBD per VM as suggested before. You only need dual primary if you want to do live migration between NODE-1 and NODE-2 and in that case the classic 3-way setup doesn't work. If you don't need live migration, do classic 3-way setups. Hope that help, Matt. -- Matthieu Labbé http://mattlabbe.com/