A GIS team needs a home directory that many EC2 analysis instances can mount concurrently with POSIX semantics. Which storage service should the architect choose?
Select an answer to reveal the explanation.
Short Explanation
GIS home dirs are a shared kitchen—everyone needs the fridge at once. EFS gives concurrent POSIX mounts; one EBS volume is a fridge locked to one chef. S3 is a warehouse of boxes, not a POSIX home path.
Full Explanation
Amazon EFS provides a managed NFS file system for concurrent multi-instance POSIX access, which fits GIS home directories shared by many compute nodes. A single EBS volume attaches to one instance (except specialized multi-attach cases that still do not replace shared home-dir NFS semantics for general tools). S3 is object storage, not a native POSIX home filesystem for arbitrary desktop GIS tooling. Instance store is ephemeral and local-only.