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
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