[ClusterLabs] Booth ticket multi-site and quorum /Pacemaker
vietnguyen1254 at gmail.com
Thu Feb 24 04:28:58 EST 2022
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?
On Wed, 23 Feb 2022 at 17:08, Jan Friesse <jfriesse at redhat.com> wrote:
> 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
> > (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
> > 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
> > 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
> > 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
> 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
> > Thank you so much for your help!
> > Regards,
> > Viet
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