As usual, my cluster is limited in resources (what you get for using the cheapest VPS available, I guess). Recently for whatever reason, one of my nodes has been constantly getting high IO and CPU warnings. As usual, this was caused by high swap activity due to memory exhaustion. The thing is, I didn’t really understand why that would suddenly start to happen.

Things (which may or may not be detailed in a later post) happened and I ended up wanting to migrate the MariaDB powering this blog to a different node. This is when all hell broke loose.