I will try to answer all questions point by point.
- The CPU credits are not divided between EBS or any other CPU usage. Just like any other operating system some of the CPU is used for storage I/O. AWS provides dedicated connectivity to your EBS volumes so the I/O is not impacted by your network usage. For more information about baseline of different EBS offerings please check: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-volume-types.html
- No, the throughput is based on volume. If you have 3 EBS volumes and for example you create Raid 0 you will technically get combined throughput, but I am sure there must be some upper limit which I have not seen yet. The information about Raid 0 and other performance tricks is documented at: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSPerformance.html
- When you create t3 instance you get the option to select your EBS volume type.
- 1x75GV NVMe is the local SSD on the instance, which means you can't detach that SSD and attach it to another instance. Its physicaly connected to the instance because it exists on the same physical host where the instance is hosted.
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