Write heavy cluster, more RAM or CPU?

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I'm using EC2 instance. Looking at i3.2xlarge which gives a tons of storage, but wondering if that's the best for write heavy cluster.

There will be maybe 70% insert/upsert, and 20% scan query, with probably just 10% get by id. All of these doesn't require a tons of storage, so I'm wondering if switching to some of the c5 or r5 instances is better?

Any tips helps thanks a lot!

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Indexing can be very I/O intensive, and i2 have fast disks, so should be appropriate. Best way to know is to benchmark your use case and see what resource that limits performance.

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