A large corporation recently experienced a power outage at one of its primary data centers resulting in service disruption for customers in that…

The goal is to achieve resiliency against a data center outage with a zero Recovery Point Objective (RPO) using the existing 12 hosts. A vSAN Stretched Cluster is the only solution that meets all these criteria. By relocating six hosts to a second data center and configuring a stretched cluster with a witness in a third location, the administrator creates a single, logical datastore that spans both sites. Data is written synchronously to both sites, ensuring an RPO of zero. If one data center fails, vSphere HA automatically restarts the VMs on the surviving site with no data loss. The low resource utilization (<30%) confirms there is sufficient capacity to run the entire workload on one site after a failure.

B. VMware Live Recovery (or Site Recovery Manager) typically uses asynchronous replication, which results in an RPO greater than zero and would not meet the requirement.
C. A RAID-1 storage policy with FTT=2 protects against host or component failures within a single data center, not a complete site failure.
D. Fault domains provide resiliency against rack-level failures within a single data center. They offer no protection if the entire data center goes offline.

1. VMware vSAN 8.0 Stretched Cluster Guide. (2022). VMware, Inc. "Stretched Cluster Concepts," pp. 8-10. This guide explicitly states that stretched clusters provide disaster recovery and uptime with an RPO of zero by synchronously replicating data between two geographically separate sites.

2. Cormac Hogan & Duncan Epping. (2020). Essential Virtual SAN: Administrator's Guide to VMware Virtual SAN, 2nd Edition. VMware Press. Chapter 7, "Stretched Clusters and 2-Node." The chapter details the architecture and benefits, highlighting its use for site-level resiliency with synchronous replication.