A city CMS needs a shared POSIX file system that multiple web instances across Availability Zones can use, and content must survive loss of one AZ. Which file storage approach fits?
Select an answer to reveal the explanation.
Short Explanation
Regional EFS is the shared filing cabinet with drawers in more than one building. Web nodes across AZs mount the same tree, and one AZ outage does not erase the cabinet. One EBS NFS export is still one building’s cabinet.
Full Explanation
Amazon EFS Regional file systems are designed for Multi-AZ durability and concurrent NFS access from instances in multiple Availability Zones. That suits a municipal CMS that needs shared POSIX content and AZ resilience. Exporting a single EBS volume, using instance store with rsync, or keeping only local disks reintroduces AZ or instance SPOFs. Prefer Regional EFS for multi-AZ shared file HA.