[ClusterLabs] Multisite Clusters: how many servers?
kdupke at suse.com
Mon Dec 7 21:51:43 EST 2015
On 12/07/2015 10:30 PM, Steven Jones wrote:
> 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.
Booth is based on the sites, not the nodes.
It doesn't matter how many nodes are at each site as long as the site
works on it's own.
When a site comes down, then booth uses an arbitrator (site) to
determine the failing site is down.
For most environments such a switch will not be done automatically but
with some organizational interaction. You don't want to switch your data
center between EU and US if not really needed, without an SEC filing, or
whatever some C* has in mind. Of course this is not a technical
limitation but an organizational.
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