Question 1 of 12
You have two OCI Compute instances in a region with a single availability domain. How would you place them so routine hardware maintenance or a rack-level failure is less likely to affect both, and why?
Strong Interview Answer
Place redundant instances in different fault domains within the availability domain. Fault domains group separate hardware and provide anti-affinity against correlated hardware failures and maintenance. This improves availability without requiring a second region.
What to Listen For
- different fault domains
- hardware/rack isolation
- anti-affinity
- same availability domain is acceptable
- failure scope matches the design
Caution
A strong answer explains why fault domains solve this failure scope; it should not substitute compartments, subnets, or a larger shape for physical fault isolation.