Fun fact: lots of exchanges claim their matching engine can process huge numbers of orders per second. They're basically all lying.
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Is this really a problem with nvme discs though? Their IOPS is batshit insane now. Even RAMdiscs, despite being volatile, can be realtime-streamed to a non-volatile mirror backup.
AWS conf is opaque from what I experienced. Unless you know details you can't go HF. We use raid10 (8 disk) setup on all servers. And back to back connectivity is key for efficient replica. If you get a server with 70+ cores + 8 SSDs on AWS you're paying them new every 5 months.
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I'm not really coming at it from a cost standpoint, more a theoretical "what is possible with modern hardware". Based on what I've seen, AWS costs are insane, yeah. Is the peering\colo\replication\whatever the term is ever worth it? They've gotta be massive for a reason.
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Regarding peering HFT requires cross-connect and colo. This will reduce latency drastically. You can see that AWS is suboptimal here too, since you can peer from same region but pass through undetermined number of hops and hardware.
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