What is difference between implementing RAID 0 and just attaching multiple EBS Volumes on AWS EC2? Both seem to just sum the performance.
Any other operational differences.
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Answers
You can certainly create a RAID with EBS. AWS Actually has a guide on how to configure RAID 0 (which is the recommended one) with 2 or more EBS volumes.
RAID 0 arrays on Amazon EBS boost file system performance by spreading I/O across multiple volumes. They’re best for high-performance needs. Adding volumes increases throughput and IOPS, but performance is limited by the slowest volume, and losing any volume means losing all data. The array’s size and bandwidth are the combined sizes and bandwidths of its volumes. For example, two 500 GiB io1 volumes with 4,000 IOPS each form a 1000 GiB RAID 0 array with 8,000 IOPS and 1,000 MiB/s throughput.
To prevent catastrophic data loss, it is recommended to backup your RAID volumes with EBS multi-volume snapshots
Adding multiple EBS volumes on EC2 without creating a RAID does not "sum" the performance. With individual volumes simply mapped to separate mount points, you would only get the performance of a single volume (the volume mounted to the path you are writing to) during any write operation.