It is possible to configure EBS with RAID 0 in order to achieve a higher level of performance for a file system, as described here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/raid-config.html
However, this does add complexity to your solution.
I would personally look at the I/O rates of the different EBS volume types. For example, io2 provisioned IOPS storage can support up to 64,000 IOPS, and io2 Block Express up to 256,000 IOPS.
You are restricted to using EC2 instances that are built on the Nitro architecture, however, and io2 Block Express only work on r5b instances.
To echo what Dennis mentioned, I tend to avoid using any RAID in the disk setup. Main advantage when using single disk is the simplicity when dealing with backup using Snapshots. For performance concern, io2 Block Express should be covering the high performance requirement in most of the general use cases. Hope this helps.
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