Correct Answer: D

Explanation: The updated policy is serially applied to the virtual machines is the correct answer because changing the rule in the assigned policy will trigger a policy compliance check and a resynchronization of the affected objects. The policy change will not be rejected, queued, or ignored, as it is a valid and supported operation. However, the policy change will not be applied in parallel, as that would cause too much network and disk traffic. Instead, the policy change will be applied one virtual machine at a time, starting with the most critical ones, until all virtual machines are compliant with the new policy. References: VMware vSAN Specialist v2 Exam Preparation Guide, page 9

Correct Answer: D

Explanation: The correct answer is D, add additional capacity disks to each disk group. This is because adding capacity disks to existing disk groups is the fastest and easiest way to expand the capacity of the vSAN datastore without disrupting any ongoing operations or requiring additional hardware. The administrator can add up to five capacity disks per disk group in vSAN OSA, which means each host can have up to 25 capacity disks in total. The administrator should make sure that the new capacity disks are unformatted and not partitioned, so that vSAN can recognize and claim them. The administrator should also manually rebalance the cluster after adding the capacity disks to distribute the data evenly across the new devices. The other options are incorrect for the following reasons: A, enable Deduplication and Compression on the cluster level, is incorrect because enabling Deduplication and Compression is not a recommended way to expand the capacity of the vSAN datastore. Deduplication and Compression is a space efficiency feature that reduces the logical space consumption of data by eliminating duplicate blocks and applying compression algorithms. However, enabling Deduplication and Compression requires a full data evacuation and resynchronization, which can be disruptive and time-consuming. Deduplication and Compression also introduces additional CPU and memory overhead, which can affect the performance of the cluster. Deduplication and Compression is only supported on all-flash clusters, not on hybrid clusters. B, add additional capacity by adding a disk on one host and creating a storage pool, is incorrect because creating a storage pool is not supported in vSAN OSA. A storage pool is a new configuration introduced in vSAN 8 ESA, where all disks are treated as capacity disks and use a new algorithm to distribute data acrossthem. This configuration is not compatible with vSAN OSA, which uses a disk group configuration where one disk is designated as a cache disk and the rest are capacity disks. To use a storage pool, the administrator would need to migrate to vSAN 8 ESA on a new cluster with new hardware. C, add additional capacity by adding a vSAN ReadyNode to the cluster, is incorrect because adding a vSAN ReadyNode to the cluster is not the fastest or easiest way to expand the capacity of the vSAN datastore. A vSAN ReadyNode is a preconfigured server that meets the hardware requirements for running vSAN. Adding a vSAN ReadyNode to the cluster would require additional hardware procurement, installation, and configuration. It would also increase the compute capacity of the cluster, which may not be necessary for the workload. Adding a vSAN ReadyNode would also trigger a resynchronization of data across the cluster, which can affect the performance and availability of the cluster. References: VMware vSAN Specialist v2 Exam Preparation Guide, page 10

Correct Answer: C

Explanation: A possible cause of high latency on the vSAN cluster is that there is congestion in one or more disk groups. Congestion is a measure of how busy the storage devices are in handling I/O requests. When congestion is high, it means that the storage devices are overloaded and cannot process the requests fast enough, resulting in increased latency and reduced throughput. Congestion can be caused by various factors, such as insufficient cache capacity, disk failures, network issues, or heavy workload. The other options are not likely to cause high latency on the vSAN cluster. The Virtual Machines can use PVSCSI controllers without affecting latency, as they are optimized for high performance. Erasure Coding is a space efficiency feature that does not impact latency significantly. Jumbo frames are not required for vSAN, and enabling them does not guarantee lower latency. References: vSAN Performance Monitor; [vSAN Congestion Explained]

Correct Answer: A

Explanation: VMware Cloud on AWS is a service that delivers a fully managed VMware SDDC on AWS infrastructure. It uses vSAN as the mandatory, primary storage for the SDDC clusters. vSAN provides a high-performance, resilient, and secure shared storage solution for the VMware Cloud on AWS environment. The other options are not correct, as vSAN is not mandatory or primary for them. VMware Horizon, VMware Aria Automation, and Tanzu Kubernetes Grid Integrated Edition can use vSAN as an optional or secondary storage solution, but they can also use other types of storage. References: , section 1.1; , section 1.2

Correct Answer: BE

Explanation: An all-flash vSAN ESA cluster with four nodes can satisfy the storage policies that require FTT=2 (RAID-1 Mirroring) or FTT=2 (RAID-6 Erasure Coding). These policies mean that the cluster can tolerate two host failures while maintaining data availability and redundancy. RAID-1 Mirroring creates three replicas of each object across different hosts, while RAID-6 Erasure Coding splits each object into four data segments and two parity segments across different hosts. Both policies require at least four hosts in the cluster to meet the FTT=2 requirement. The other options are not correct. An all-flash vSAN ESA cluster with four nodes cannot satisfy the storage policies that require FTT=3 (RAID-1 Mirroring) or FTT=1 (RAID-5 Erasure Coding). These policies mean that the cluster can tolerate three or one host failure respectively, but they require more or less hosts than four to do so. RAID-1 Mirroring with FTT=3 requires at least six hosts in the cluster to create four replicas of each object, while RAID-5 Erasure Coding with FTT=1 requires at least three hosts in the cluster to split each object into two data segments and one parity segment. References: vSAN Express Storage Architecture; RAID Configurations, FTT, and Host Requirements

Correct Answer: CE

Explanation: Two characteristics of the vSAN Data-At-Rest Encryption (DARE) are that it is Software Defined and works independently of the Cache or Capacity drives installed on the Nodes, and that it continues to operate unaffected during downtime on vCenter Server. DARE is a feature that encrypts all data stored on vSAN disks using AES-256 XTS mode. It does not require Self-Encrypting Drives (SEDs) to work, as it uses software-based encryption keys that are generated by an external Key Management Server (KMS) or a vSphere Native Key Provider. DARE also does not depend on the type or size of the disks used in the vSAN cluster, as it encrypts data after all other processing, such as deduplication and compression, is performed. DARE can function even when the vCenter Server is offline or unavailable, as it uses key persistence to store the encryption keys on the ESXi hosts or in a Trusted Platform Module (TPM). The hosts can access the keys without contacting the KMS or the vCenter Server. The other options are notcorrect, as they do not describe DARE accurately. DARE does not need to be enabled together with the vSAN Data-In-Transit encryption, as they are independent features that can be enabled or disabled separately. Data-In-Transit encryption encrypts data that is transmitted between hosts in a vSAN cluster using secure sockets layer (SSL) certificates. DARE is supported on Stretched Cluster environments, as it can encrypt data across multiple sites using site affinity rules.

Correct Answer: A

Explanation: In a vSAN stretched cluster configuration, both data sites are active sites, but one site must be designated as the preferred site and the other site as the secondary or nonpreferred site. This configuration helps to ensure that data remains on a given site in case of a network partition between the sites. If the network connection between the two active sites is lost, vSAN continues operation with the preferred site, unless it is resyncing or has another issue. The site that leads to maximum data availability is the one that remains in operation. The other options are not relevant to this scenario. References: Introduction to Stretched Clusters; vSAN Stretched Cluster Guide

Correct Answer: D

Explanation: When a host in a vSAN stretched cluster goes offline, the data components on the hosts will be marked as degraded. This means that the data is still available, but the redundancy level is reduced. vSAN will try to rebuild the missing components on another host in the same fault domain, if there is enough capacity and resources. If the host comes back online within 60 minutes, vSAN will resync the data and restore the redundancy level. If the host does not come back online within 60 minutes, vSAN will rebuild the missing components on another fault domain, if there is enough capacity and resources. This will incur additional network traffic across the witness link. References: VMware vSAN Specialist v2 EXAM 5V0-22.23, page 17

Correct Answer: BE

Explanation: A durability component is a temporary component that is created when a host or disk group is placed in maintenance mode with the Ensure data accessibility option, or when a host or disk group fails unexpectedly. A durability component improves the availability of data by maintaining the required number of failures to tolerate (FTT) until the original component is restored or rebuilt. A durability component also speeds up the resynchronization process by reducing the amount of data that needs to be copied. The other characteristics are not applicable to a durability component. References: VMware vSAN Specialist v2 EXAM 5V0-22.23, page 10, Objective 6.8; [Durability Components]

Correct Answer: A

Explanation: If vSAN is able to locate a full replica of 55% of the votes for the noncompliant objects of a virtual machine, vSAN will mark the virtual machine as compliant and automatically recover the noncompliant objects. This is because vSAN uses a quorum- based algorithm to determine object availability and compliance. An object is considered available if more than 50% of its votes are accessible, and compliant if it meets its assigned storage policy requirements. In this case, since 55% of the votes are accessible, vSAN can access a full replica of each object and restore its compliance state by rebuilding any missing or corrupted components. The other options are not correct. vSAN will not power off, mark as inaccessible, or mark as orphaned a virtual machine that has more than 50% of its votes accessible, as these actions would result in unnecessary downtime or data loss. References: Object States That Indicate Problems in vSAN; Accessibility of Virtual Machines Upon a Failure in vSAN