GCP Associate Cloud Engineer Practice Question

Your team is lifting a legacy POSIX-compliant application to Compute Engine. The application must

be able to mount the same filesystem from 300 VMs in the same region,
grow from 10 TB to at least 80 TB in the next year,
survive a single-zone outage with no data loss (RPO = 0) and minimal failover time,
avoid managing any storage servers yourself.

Which Google Cloud storage product best meets the requirements while keeping management overhead low?

Provision Google Cloud NetApp Volumes and use its SMB share from the VMs.
Store data in a multi-regional Cloud Storage bucket and access it with the Cloud Storage FUSE driver.
Attach regional persistent disks to one VM in each zone and export them over NFS.
Create a Filestore Enterprise instance and mount it on the VMs over NFS.

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Answer Description

Filestore Enterprise is a fully managed NFS service that synchronously replicates data across two zones in the same region, giving it a zero-RPO design and automatic failover with a very small RTO. It supports up to 100 TB per instance and hundreds of concurrent VM clients, satisfying the growth and scalability goals without administrators having to run their own file servers.

A zonal persistent disk or a regional persistent disk exported with NFS would need you to configure and operate the NFS servers yourself, which violates the "no server management" requirement. Cloud Storage provides object storage, not a POSIX filesystem that can be mounted by the VMs. Google Cloud NetApp Volumes is also fully managed and multi-zone, but it is targeted at customers who need NetApp-specific data-management features; choosing it when advanced NetApp functionality is not needed would add cost and complexity that the scenario does not call for.

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