Storage Management & Availability Flashcards
6 cards from real VCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Storage Management & Availability flashcards as text
What is a Raw Device Mapping (RDM) in vSphere and when is it typically used?
Answer: A method to directly present a SAN LUN to a VM, bypassing VMFS for applications requiring direct block access
An RDM maps a SAN LUN directly to a virtual machine, allowing applications like Oracle RAC or Microsoft clustering that require direct block device access to function properly.
In vSphere HA, what is the 'Admission Control' feature designed to do?
Answer: Reserve cluster resources to ensure VMs can be restarted after a host failure
Admission Control reserves a portion of cluster CPU and memory capacity to guarantee that VMs can be restarted on surviving hosts in the event of a host failure.
Which vSphere component manages the lock mechanism that prevents multiple ESXi hosts from writing to the same VMFS datastore file simultaneously?
Answer: SCSI reservations and ATS (Atomic Test and Set)
VMFS uses SCSI reservations and the hardware-accelerated Atomic Test and Set (ATS) primitive to manage file locking and prevent concurrent write conflicts across hosts.
What is the purpose of a vSphere 'datastore cluster' (also known as a Storage Pod)?
Answer: To group multiple datastores and manage them as a single unit with Storage DRS
A datastore cluster groups multiple datastores into a single management unit, enabling Storage DRS to automatically balance VM disk placement across all datastores in the cluster.
Which vSphere high availability feature can automatically migrate VMs away from a host that is experiencing performance degradation before it fails?
Answer: Proactive HA
Proactive HA integrates with hardware partner health APIs to detect degrading host components and proactively evacuate VMs before a failure occurs.
In a vSAN stretched cluster configuration, what is the role of the 'witness host'?
Answer: It holds witness components and provides tie-breaking votes to prevent split-brain scenarios
The witness host in a vSAN stretched cluster holds witness components (metadata only) and casts the deciding vote during a network partition to prevent split-brain between the two data sites.
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