An active-passive two-zone Compute Engine deployment writes to a disk. If one zone fails, the other instance must have immediate access to the latest data with minimal downtime and highest performance. What storage configuration do you use?

A regional SSD persistent disk is the optimal choice for this active-passive scenario because it provides synchronous replication of data across two zones within the same region. This ensures that if the primary zone fails, the disk can be immediately force-attached to the instance in the secondary zone, offering minimal downtime and access to the latest data with high performance. Option 1 involves snapshots, which introduce recovery point objective (RPO) and recovery time objective (RTO) delays due to the hourly snapshot interval and the time required to create a new disk. Option 2 uses Cloud Storage, which is object storage and typically has higher latency than persistent disks, making it unsuitable for high-performance requirements. Option 4 uses local SSDs, which are ephemeral and not designed for data persistence across instances, and rsync introduces data staleness and manual synchronization overhead.