If you have to ask that question, I strongly recommend m4 or c4 instances with GP2 EBS. When you don’t care about replacing a node because of an instance failure, go with i2+ephemerals. Until then, GP2 EBS is capable of amazing things, and greatly simplifies life.
We gave a talk on this topic at both Cassandra Summit and AWS re:Invent: https://www.youtube.com/watch?v=1R-mgOcOSd4 It’s very much a viable option, despite any old documents online that say otherwise. From: Eric Plowe Reply-To: "user@cassandra.apache.org" Date: Friday, January 29, 2016 at 4:33 PM To: "user@cassandra.apache.org" Subject: EC2 storage options for C* My company is planning on rolling out a C* cluster in EC2. We are thinking about going with ephemeral SSDs. The question is this: Should we put two in RAID 0 or just go with one? We currently run a cluster in our data center with 2 250gig Samsung 850 EVO's in RAID 0 and we are happy with the performance we are seeing thus far. Thanks! Eric
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