Hi, Thank you so so much for your help. May i ask a following up question:
For the option of having one big cluster with 4 nodes without booth, then, if one site (having 2 nodes) is down, then the other site does not work as it does not have quorum, am I right? Even if we have a quorum voter in either site A or B, then, if the site with quorum down, then, the other site does not work. So, how can we avoid this situation as I want that if one site is down, the other site still services? Regards, Viet On Wed, 23 Feb 2022 at 17:08, Jan Friesse <jfrie...@redhat.com> wrote: > Viet, > > On 22/02/2022 22:37, Viet Nguyen wrote: > > Hi, > > > > Could you please help me out with this question? > > > > I have 4 nodes cluster running in the same network but in 2 different > sites > > (building A - 2 nodes and building B - 2 nodes). My objective is to > > setup HA for this cluster with pacemaker. The expectation is if a site is > > down, the other site still services. > > > > From what I could understand so far, in order to make it work, it needs > to > > have booth ticket manager installed in a different location, let's say > > building C which connects to both sites A and B. > > > > With this assumption, i would like to ask few questions: > > > > 1. Am i right that I need to setup the booth ticket manager as a > quorum > > voter as well? > > Yes, booth (arbitrator) has to be installed on "site" C if you want to > use booth. Just keep in mind booth has nothing to do with quorum. > > > 2. What happens if the connection between site A and B is down, but > the > > connection between A and C, B and C still up? In this case, both > site A and > > B still have the quorum as it can connect to C, but not between each > other? > > If you use booth then it's not required site A to see site B. It's then > "site" C problem to decide which site gets ticket. > > > > 3. Or is there any better way to manage 2 sites cluster, each has 2 > > nodes? And if one site is down like environmental disaster, then, > the other > > site still services. > > Basically there are (at least) two possible solutions: > - Have one big cluster without booth and use pcmk constraints > - Have two 2 node clusters and use booth. Then each of the two node > clusters is "independent" (have its own quorum) and each of the cluster > runs booth (site) as a cluster resource + "site" C running booth > (arbitrator) > > Regards, > Honza > > > > > > > Thank you so much for your help! > > Regards, > > Viet > > > > > > _______________________________________________ > > Manage your subscription: > > https://lists.clusterlabs.org/mailman/listinfo/users > > > > ClusterLabs home: https://www.clusterlabs.org/ > > > >
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