[ClusterLabs] Multisite Clusters: how many servers?

Steven Jones Steven.Jones at vuw.ac.nz
Mon Dec 7 16:30:00 EST 2015


My 2 cents,

You need to be able to form a quorum to keep writes going in case of a split brain scenario, if that is important to you and you can/prepared to pay for it, if its data protection only then a fail safe to read only is all you need.

So 3 machines a quorum is 2, 15 machines the quorum is 8.

I am actually building 1 at the moment with gluster as the backend so the main site will have 2 and DR one.



From: Digimer <lists at alteeve.ca>
Sent: Tuesday, 8 December 2015 10:00 a.m.
To: ms at sys4.de; Cluster Labs - All topics related to open-source clustering welcomed
Subject: Re: [ClusterLabs] Multisite Clusters: how many servers?

On 07/12/15 03:57 PM, Michael Schwartzkopff wrote:
> Hi,
> it is possible / advisable to set up a multisite cluster with booth with one
> server at each site?
> So having three servers all together?
> Mit freundlichen Grüßen,
> Michael Schwartzkopff

As I understand it, no. You need a cluster on each site to be able to
trust that a lost site behaves predictably.

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