Hi Gordan,

Thanks for your reply! :-) Very valuable and interesting, as always.

What exact problem are you trying to solve?

We are designing new intranet setup, in three OTAP variants: PRD/ACC/TST, each consisting of one frontend application and one backend mariadb server.
(6 VMs total)

In this setup, the DB would not be HA, and therefore I proposed: let's combine the three OTAP DB backend servers into one single 3-node galera intranet DB cluster. (and use haproxy on the application servers to failover when needed, which we also do in other galera setups we have))

That proposal was not greeted with enthousiasm, because it was feared that a misbehaving ACC/TST server (like filling up the disk, for example) would interfere with the PRD side of things.

DB load etc is going to be moderate, so that part is actually is not a real issue, but I understood the full-datadir concern, and that is primarily what I am trying to address.

Having understood your objections...I am now gojng to look for different ways to address the #1 concern: limit the diskspace per dbX-user, or per DB.

Thanks!
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