How are instances within an instance pool typically distributed?

Instances within an instance pool are typically distributed across fault domains based on capacity to ensure high availability and reliability of services. Fault domains refer to distinct groups of resources that are designed to fail independently, allowing for redundancy and better resilience in the face of hardware failures. By distributing instances across these fault domains, the system can maintain service continuity even if one domain experiences issues.

This method also takes into account the capacity of each fault domain, helping to optimize resource utilization and prevent any single domain from becoming a bottleneck. Balancing instances based on capacity ensures that workloads are efficiently managed and that resources are appropriately allocated, further enhancing performance and scalability. In high-performance computing (HPC) and large data environments, this distributed model is critical to achieving optimal operational efficiency and reliability.