What do the key EC2 instance-family letters mean: C, M, R, X, U, I, T?

You need an SAP app server running in a second AZ for HA. Your VPC already exists. What do you actually have to create, and what is the common misconception about VPC/subnet scope?

An SAP HANA volume is running low on IOPS in production. A colleague plans to stop the instance to grow the volume and bump IOPS. Why is the downtime unnecessary, and what's the one capability that still carries a volume-type restriction?

For SAP DR planning, what does the ~100 km AZ separation actually buy you, and why is spreading across AZs NOT a substitute for a second Region?

Your SAP backup automation fails creating an S3 bucket with 'BucketAlreadyExists' even though you've never used that name. What scope is the name unique in, and what hard object limit should backup tooling respect?

An SAP-adjacent workload must stay physically in your own datacenter for a data-residency/security mandate. Which AWS extension fits, and how is it different from a Local Zone or Wavelength Zone?

Which EC2 placement group do you choose for an SAP HANA scale-out cluster, why is the fault-tolerant option the wrong instinct here, and do placement groups improve your EC2 SLA?