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[quote=jsteele][quote=Anonymous]What are the symptoms as the site grinds down?[/quote]

We have a database cluster of two nodes. Both nodes are underpowered and relatively low on memory. I built the cluster for redundancy rather than performance because additional performance was not previously necessary, but redundancy is important. Beginning about a week ago, the load on the database nodes suddenly gets very high. We start seeing a combination of the cluster dropping connections and connections timing out. Also, the cluster starts reporting some tables as being "read-only" even though they are "read-write".

Two new servers will arrive tomorrow. They are built for performance with loads of memory and solid-state drives. That should eliminate any performance issues with the database nodes. In the meantime, I'm doing everything I can to monitor the cluster to try to find settings that can be tuned for better performance. But, there are literally thousands of settings, of which I probably understand about 2 or 3. So, that is pretty challenging.
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