VMware Certified Professional - Data Center Virtualization (VCP-DCV) Practice Exam

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What could prevent Storage Distributed Resource Scheduler (SDRS) from functioning properly on a datastore?

  1. The datastore is hosted on an NFS server

  2. The datastore has Storage I/O Control disabled

  3. The datastore is connected to an unsupported host

  4. The datastore is hosted on an iSCSI server

The correct answer is: The datastore has Storage I/O Control disabled

The correct answer focuses on the requirement for Storage Distributed Resource Scheduler (SDRS) to function effectively. Specifically, having Storage I/O Control enabled on the datastore is critical for SDRS to monitor and manage storage resources intelligently. Storage I/O Control allows for the dynamic distribution of I/O requests based on pre-defined resource pools and performance policies, which is essential for SDRS to optimize resource utilization and prevent potential bottlenecks. When Storage I/O Control is disabled, SDRS lacks the necessary information to make informed decisions about how to balance storage workloads across the datastores in the cluster. Without the performance metrics and I/O control measures provided by Storage I/O Control, SDRS cannot perform its functions effectively, leading to reduced efficiency in resource management. Other choices may seem problematic, but they do not directly impede the functioning of SDRS as significantly as the disabling of Storage I/O Control does. For instance, a datastore being hosted on an NFS or iSCSI server generally supports SDRS, depending on the overall configuration, and not being connected to a supported host might limit some functionalities, but it does not necessarily prevent SDRS from operating entirely.

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