Professional Cloud ArchitectDemo

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QuestionQ131

Designing and planning a cloud solution architecture

You have been hired by your client to lead the migration of their application infrastructure to GCP. A current issue is that their on-premises high-performance SAN needs frequent, costly upgrades to keep pace with these identified workloads:

  • 20 TB of log archives kept for legal reasons
  • 500 GB of VM boot/data volumes and templates
  • 500 GB of image thumbnails
  • 200 GB of customer session-state data that lets customers restart sessions even after being offline for several days

Which option best represents your recommendations for a cost-effective storage allocation?

  • A Local SSD for customer session state data. Lifecycle-managed Cloud Storage for log archives, thumbnails, and VM boot/data volumes.
  • B Memcache backed by Cloud Datastore for the customer session state data. Lifecycle-managed Cloud Storage for log archives, thumbnails, and VM boot/data volumes.
  • C Memcache backed by Cloud SQL for customer session state data. Assorted local SSD-backed instances for VM boot/data volumes. Cloud Storage for log archives and thumbnails.
  • D Memcache backed by Persistent Disk SSD storage for customer session state data. Assorted local SSD-backed instances for VM boot/data volumes. Cloud Storage for log archives and thumbnails.
Explanation

Customer session state that must survive customers being offline for several days needs durable storage. Memcache can provide low-latency cached access, while Cloud Datastore persists the session data. Local SSD is temporary storage and may lose data when its VM stops, restarts, crashes, or is terminated; it also cannot be used as a boot device. Cloud Storage lifecycle rules can automatically transition or manage objects to reduce the cost of retained archives and other object data.

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