We are running on I3s since they came out. NVMe SSDs are really fast and I managed to push them to 75k IOPs. As Bhuvan mentioned the i3 storage is ephemeral. If you can work around it and plan for failure recovery you are good to go.
I ran Cassandra on m4s before and had no problems with EBS volumes (gp2) even in low latency use cases. With the cost of M4 instances and EBS volumes that make sense in IOPs, I would recommend going with more i3s and working around the ephemeral issue (if its an issue). Best, Matija On Tue, May 23, 2017 at 2:13 AM, Bhuvan Rawal <bhu1ra...@gmail.com> wrote: > i3 instances will undoubtedly give you more meat for buck - easily 40K+ > iops whereas on the other hand EBS maxes out at 20K PIOPS which is highly > expensive (at times they can cost you significantly more than cost of > instance). > But they have ephemeral local storage and data is lost once instance is > stopped, you need to be prudent in case of i series, it is generally used > for large persistent caches. > > Regards, > Bhuvan > > On Tue, May 23, 2017 at 4:55 AM, Gopal, Dhruva <dhruva.go...@aspect.com> > wrote: > >> Hi – >> >> We’ve been running M4.2xlarge EC2 instances with 2-3 TB of storage and >> have been comparing this to I-3.2xlarge, which seems more cost effective >> when dealing with this amount of storage and from an IOPS perspective. Does >> anyone have any recommendations/ on the I-3s and how it performs overall, >> compared to the M4 equivalent? On the surface, without us having taken it >> through its paces performance-wise, it does seem to be pretty powerful. We >> just ran through an exercise with a RAIDed 200 TB volume (as opposed to a >> non RAIDed 3 TB volume) and were seeing a 20-30% improvement with the >> RAIDed setup, on a 6 node Cassandra ring. Just looking for any >> feedback/experience folks may have had with the I-3s. >> >> >> >> Regards, >> >> *DHRUVA GOPAL* >> >> *sr. MANAGER, ENGINEERING* >> >> *REPORTING, ANALYTICS AND BIG DATA* >> >> *+1 408.325.2011 <+1%20408-325-2011>* *WORK* >> >> *+1 408.219.1094 <+1%20408-219-1094>* *MOBILE* >> >> *UNITED STATES* >> >> *dhruva.go...@aspect.com <dhruva.go...@aspect.com> * >> >> *aspect.com <http://www.aspect.com/>* >> >> [image: escription: http://webapp2.aspect.com/EmailSigLogo-rev.jpg] >> >> >> This email (including any attachments) is proprietary to Aspect Software, >> Inc. and may contain information that is confidential. If you have received >> this message in error, please do not read, copy or forward this message. >> Please notify the sender immediately, delete it from your system and >> destroy any copies. You may not further disclose or distribute this email >> or its attachments. >> > >
