An administrator has deployed a new vSAN OSA cluster that contains eight hosts and needs to configure a storage policy for the currently deployed database virtual machines. The requirements state that if two hosts in the vSAN OSA cluster fail, all virtual machines are unaffected.
Which RAID configuration must the administrator use in this storage policy to achieve the best performance for the database virtual machines?
Correct Answer:A
To achieve the best performance for the database virtual machines and tolerate two host failures in a vSAN OSA cluster, the administrator must use RAID-1 as the RAID configuration in the storage policy. RAID-1 is a mirroring technique that creates multiple replicas of each object across different hosts. RAID-1 provides the best performance among the available RAID configurations, as it does not involve any parity calculations or stripe splitting. To tolerate two host failures, the administrator must set the Failures to Tolerate (FTT) policy to 2, which means that each object will have three replicas. The other options are not correct. RAID-5 and RAID-6 are erasure coding techniques that split each object into data segments and parity segments across different hosts. RAID-5 can tolerate one host failure, while RAID-6 can tolerate two host failures. However, both RAID-5 and RAID-6 have lower performance than RAID-1, as they involve more complex calculations and network traffic. RAID-0 is a striping technique that splits each object into multiple stripes across different hosts. RAID-0 does not provide any data redundancy or fault tolerance, and therefore cannot tolerate any host failure.
References: RAID Configurations, FTT, and Host Requirements; RAID 5 or RAID 6 Design Considerations
An administrator must choose between deploying a virtual witness or a physical witness for a vSAN Stretched Cluster. The administrator eventually decides to use a virtual witness.
What is a benefit of selecting this approach?
Correct Answer:C
The correct answer is C, reduced vSphere licensing. This is because using a virtual witness appliance instead of a physical witness host can save on vSphere licensing costs, as the virtual witness appliance does not consume a vSphere license. The virtual witness appliance is a preconfigured virtual machine that runs ESXi and is distributed as an OVA file. It can be deployed on any ESXi host that has network connectivity to both data sites of the stretched cluster. The virtual witness appliance does not run any virtual machines other than itself and only hosts witness components of virtual machine objects. The other options are incorrect for the following reasons:
✑ A, increased vSAN datastore capacity, is incorrect because using a virtual witness appliance does not affect the vSAN datastore capacity. The witness appliance does not store any customer data, only metadata, such as the size and UUID of vSAN object and components. The witness appliance also does not contribute any storage devices to the vSAN datastore.
✑ B, shared metadata between separate clusters, is incorrect because using a virtual witness appliance does not enable sharing metadata between separate clusters. The witness appliance is dedicated to one stretched cluster and cannot serve as a witness for multiple clusters. The witness appliance maintains consistency between the two data sites of the stretched cluster by hosting witness components that act as tie-breakers in case of a site failure or network partition.
✑ D, additional compute capacity for running VMs, is incorrect because using a virtual witness appliance does not provide additional compute capacity for running VMs. The witness appliance does not run any VMs other than itself and does not participate in any compute operations of the stretched cluster. The witness appliance only hosts witness components that consume minimal CPU and memory resources. References:
✑ VMware vSAN Specialist v2 Exam Preparation Guide, page 11
✑ Deploying a vSAN Witness Appliance
An administrator is tasked to create a Kerberos secured NFS v4.1 file share.
Which information is minimally required during the configuration of the File Service?
Correct Answer:B
To create a Kerberos secured NFS v4.1 file share, the administrator needs to provide the following information during the configuration of the File Service:
✑ Active Directory Domain: The domain name of the Active Directory server that provides Kerberos authentication service for the NFS server and clients. For example, example.com.
✑ User Account: The user name of the Active Directory account that has permissions to join the NFS server to the domain and create service principal names (SPNs) for the NFS server. For example, administrator@example.com.
✑ Password: The password of the Active Directory account that is used for authentication. For example, P@ssw0rd.
These information are required to enable Kerberos security for NFS 4.1 and allow the NFS server to obtain a Kerberos ticket from the Active Directory server. The administrator also needs to specify the NFS share name, path, and access permissions1 References: 1: VMware vSphere Storage Guide, page 118
The vSphere Client reports that the state of some components stored on the vSAN datastore are in the reconfiguring state.
Which situation causes components to enter this state?
Correct Answer:C
The reconfiguring state indicates that some components stored on the vSAN datastore are being moved or resized to meet a new storage policy requirement. This state can occur when the applied storage policy is modified, such as changing the number of failures to tolerate, stripe width, or object space reservation. The other situations will not cause components to enter this state. References: [VMware vSAN Specialist v2 EXAM 5V0-22.23], page 31
A site administrator wishes to implement HCI mesh between two clusters on vSAN that are located in geographically separate sites and which are administered within a single datacenter.
Which two requirements should the vSAN administrator consider to accomplish this goal? (Choose two.)
Correct Answer:AD
To implement HCI mesh between two clusters on vSAN that are located in geographically separate sites, the vSAN administrator should consider the following requirements:
✑ Either Layer 2 or Layer 3 communications can be used. HCI mesh supports both Layer 2 and Layer 3 network configurations, as long as the network latency and bandwidth requirements are met3
✑ The configuration must meet the same latency and bandwidth requirement as local vSAN. HCI mesh requires a network latency of less than or equal to 5 ms RTT between any two hosts in the participating clusters, and a network bandwidth of at least 10 Gbps for the vSAN network vmkernel port3 References: 3: VMware vSAN Specialist v2 Exam Preparation Guide, page 15