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NEW QUESTION # 27
A vSAN administrator has a cluster configured with a Storage Pool that was moved to a new physical DC.
Upon checking on the vSAN cluster health status, one of the ESXi hosts has two storage devices in a degraded state and must be replaced.
What must the vSAN administrator do to restore the health of the vSAN cluster with minimum risk?
- A. Remove the devices from the storage pool, replace the storage devices, claim the new devices in vSAN
- B. Remove the host from ySAN configuration, replace the faulty disks, re-create the storage pool
- C. Remove the entire storage pool, install the new devices, re-create the storage pool
- D. Remove the host from the cluster, replace the faulty disks, re-add the host to the cluster
Answer: A
Explanation:
Explanation
To restore the health of the vSAN cluster with minimum risk, the vSAN administrator must remove the devices from the storage pool, replace the storage devices, and claim the new devices in vSAN. This is because removing and replacing devices in a storage pool does not affect the availability or performance of the objects stored in that pool. The storage pool automatically rebalances the objects across the remaining devices in the pool when a device is removed, and distributes the objects across the new devices when they are added. This process is faster and safer than removing and re-adding a host to the cluster, which requires resynchronization of all objects on that host4 References: 4: VMware vSphere Storage Guide, page 133 :
VMware vSAN Design and Sizing Guide, page 38
NEW QUESTION # 28
Which vSAN maintenance mode option should be used to avoid storage policy non-compliance?
- A. Ensure accessibility
- B. Partial maintenance mode
- C. Full data migration
- D. No data migration
Answer: C
Explanation:
Explanation
To avoid storage policy non-compliance, the vSAN maintenance mode option that should be used is Full data migration. This option evacuates all data from the host to other hosts in the cluster and maintains the current object compliance state. This means that the VM objects will have access to all their replicas and will be compliant with their assigned storage policies. The other options might result in storage policy non-compliance, as they do not guarantee full data redundancy or policy adherence. Ensure accessibility only migrates the components that are essential for running the VMs, but might not have access to all their replicas.
Partial maintenance mode is not a valid option for vSAN clusters. No data migration does not evacuate any data from the host and might result in VM unavailability or data loss. References: Working with Maintenance Mode; Place a Member of vSAN Cluster in Maintenance Mode
NEW QUESTION # 29
A vSAN administrator is investigating vSAN performance related problems but cannot find any vSAN performance statistics on the cluster summary page.
Why is this situation occurring?
- A. vSAN performance statistics are only available via CLI.
- B. vSAN performance service is not enabled.
- C. The vRealize Operations Manager is not integrated with vSAN cluster.
- D. The administrator has read-only permissions on the cluster level.
Answer: B
Explanation:
Explanation
The reason why the vSAN administrator cannot find any vSAN performance statistics on the cluster summary page is that the vSAN performance service is not enabled. The vSAN performance service is a feature that collects and analyzes performance metrics and displays them in graphical charts in vCenter. The vSAN performance service must be turned on manually for each vSAN cluster, as it is not enabled by default. The other options are not correct. The integration of vRealize Operations Manager with the vSAN cluster is not required to view vSAN performance statistics, as they are available in vCenter. The administrator's permissions on the cluster level do not affect the visibility of vSAN performance statistics, as they are accessible to any user who can view the cluster. vSAN performance statistics are not only available via CLI, as they can also be viewed in vCenter using the vSAN performance service. References: About the vSAN Performance Service; Enable or Disable the Performance Service
NEW QUESTION # 30
A vSAN administrator has a vSAN cluster that is using vSphere Lifecycle Manager (vLCM) to manage hypervisor, server drivers, and firmware. All hosts in the cluster are compliant according to the vLCM image.
A 10GB NIC on the servers is experiencing issues, and the vSAN administrator determines a new network driver will resolve the problem. Unfortunately, the required NIC driver is a newer version compared to the driver provided by the most recent Vendor Add-on.
Which action should the vSAN administrator take to ensure the latest network driver is installed on the NIC before remediation?
- A. Remove theVendor Add-on from the vLCM image, and then manually install the network driver on the servers
- B. Make sure the vLCM image is configured to use the most recent version of the Vendor Add-on
- C. Modify the vLCM image to omit the NIC Driver, and then manually update the servers with the required NIC driver
- D. Add an individual component to the vLCM image that has the updated NIC driver
Answer: D
Explanation:
Explanation
To ensure the latest network driver is installed on the NIC before remediation, the vSAN administrator should add an individual component to the vLCM image that has the updated NIC driver. This action allows the administrator to override the driver provided by the vendor add-on and use a newer version that is compatible with the ESXi version and the hardware device. The administrator can add an individual component to the vLCM image by importing it from a ZIP file or selecting it from the vLCM depot. The other options are not correct. Making sure the vLCM image is configured to use the most recent version of the vendor add-on will not help, as the required NIC driver is a newer version than the one provided by the vendor add-on. Removing the vendor add-on from the vLCM image or modifying the vLCM image to omit the NIC driver will not ensure the latest network driver is installed on the NIC, as these actions will leave the NIC without any driver update. Manually installing or updating the network driver on the servers is not recommended, as it might cause inconsistency and non-compliance in the vLCM image. References: vSphere Lifecycle Manager Image Components; [Add an Individual Component to an Image]
NEW QUESTION # 31
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?
- A. RAID-6
- B. RAID-0
- C. RA1D-1
- D. RAID-5
Answer: C
Explanation:
Explanation
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
NEW QUESTION # 32
A vSAN administrator needs to enable vSAN ESA.
Which two requirements need to be met? (Choose two.)
- A. vSAN Advanced license
- B. vSAN ReadyNodes configuration
- C. vSAN Standard license
- D. vSAN Build Your Own configuration
- E. vSAN Witness Appliance
Answer: B,C
Explanation:
Explanation
To enable vSAN ESA, two requirements that need to be met are: vSAN Standard license or higher, and vSAN ReadyNodes configuration. vSAN Standard license or higher is required to use vSAN ESA, as it is a feature that is only available in vSAN 8.0 or later versions. vSAN ESA is an optional, alternative architecture to vSAN OSA that is designed to process and store data with higher efficiency, scalability, and performance.
vSAN ReadyNodes configuration is required to use vSAN ESA, as it is a hardware configuration that is pre-configured, tested, and certified for VMware Hyper-Converged Infrastructure Software. Each vSAN ReadyNode is optimally configured for vSAN ESA with the required amount of CPU, memory, network, and storage NVMe devices. The other options are not correct. vSAN Build Your Own configuration is not supported for vSAN ESA, as it might not meet the hardware requirements or compatibility for vSAN ESA.
vSAN Witness Appliance is not required to use vSAN ESA, as it is only needed for stretched cluster or two-node cluster configurations. References: vSAN Express Storage Architecture; vSAN ReadyNode Hardware Guidance
NEW QUESTION # 33
What are two prerequisites for using the TRIM and UNMAP capability of vSAN? (Choose two.)
- A. The vSAN cluster is an all-flash architecture.
- B. The VM quest operating system supports ATA TRIM or SCSI UNMAP capability
- C. Change the Object Space Reservation to 100.
- D. TRIM and UNMAP is enabled.
- E. Deduplication and compression are enabled.
Answer: A,D
Explanation:
Explanation
The two prerequisites for using the TRIM and UNMAP capability of vSAN are:
B: The vSAN cluster is an all-flash architecture. TRIM and UNMAP are only supported on all-flash vSAN clusters, as they can reclaim space from flash devices that use thin provisioning. TRIM and UNMAP are not supported on hybrid vSAN clusters, as they cannot reclaim space from magnetic disks that use thick provisioning1.
D: TRIM and UNMAP is enabled. TRIM and UNMAP are disabled by default in vSAN, as they might have a performance impact on some workloads. To enable TRIM and UNMAP on a vSAN cluster, the administrator must use the following RVC command: vsan.unmap_support -enable2. After enabling TRIM and UNMAP, the administrator must power off and then power on all VMs that use the vSAN datastore.
NEW QUESTION # 34
A vSAN administrator wants to transition from VMware Update Manager to vSphere Lifecycle Manager.
Which element is a mandatory requirement to create an image?
- A. Component
- B. Vendor Add-On
- C. Firmware and Drivers Add-On
- D. ESXi Version
Answer: D
Explanation:
Explanation
To create an image using vSphere Lifecycle Manager, the mandatory requirement is to specify the ESXi version. An image is a collection of software components that define the desired state of hosts in a cluster. An image must include at least one ESXi version component, which determines the base hypervisor software for the hosts. Optionally, an image can also include other components, such as vendor add-ons, firmware and drivers add-ons, or custom components. The other options are not correct. A component is a generic term for any software element that can be included in an image, but it is not a specific type of component. A firmwareand drivers add-on is an optional component that provides firmware and drivers updates for hardware devices on the hosts. A vendor add-on is an optional component that provides vendor-specific software for the hosts. References: About Images; Create an Image
NEW QUESTION # 35
An administrator is upgrading multiple vSAN Witness nodes with vLCM (single image management) that are used for vSAN Stretched and two-node Clusters.
What two witness node types can the administrator upgrade? (Choose two.)
- A. Appliance witness node
- B. Nested witness node
- C. Shared witness node
- D. Physical witness node
- E. Dedicated witness node
Answer: A,B
Explanation:
Explanation
To upgrade multiple vSAN Witness nodes with vLCM (single image management) that are used for vSAN Stretched and two-node Clusters, the administrator can upgrade two witness node types: appliance witness node and nested witness node. An appliance witness node is a virtual ESXi host that runs on a physical ESXi host and contains the witness components of VM objects stored in the vSAN cluster. A nested witness node is a virtual ESXi host that runs on another virtual ESXi host and contains the witness components of VM objects stored in the vSAN cluster. Both types of witness nodes can be managed by vLCM as independent nodes since vSphere 7.0 Update 3, as long as they are version 7.0 Update 2 or later. The other options are not correct. A shared witness node is a witness node that serves multiple vSAN clusters, which is not supported by vLCM. A dedicated witness node is a witness node that serves only one vSAN cluster, which is not a specific type of witness node. A physical witness node is aphysical ESXi host that contains the witness components of VM objects stored in the vSAN cluster, which cannot be upgraded by vLCM. References: vSphere Lifecycle Manager and the vSAN Witness Hosts; Shared Witness for 2-Node vSAN Deployments
NEW QUESTION # 36
A customer has deployed a new vSAN cluster with the following configuration:
5 x vSAN ReadyNodes
All Flash
12 TB Raw Storage
vSAN 8 is deployed with ESA.
New VMs are configured with a RAID-5 VM policy.
Which statement is accurate?
- A. vSAN will use a 2+1 RAID-5 data placement scheme with parity will be used
- B. vSAN will spread the components across all of the disk groups
- C. RAID 5 will provide an FTT=2 level of protection in this case
- D. vSAN will use a 4+1 RAID-5 data placement scheme with parity will be used
Answer: D
Explanation:
Explanation
vSAN will use a 4+1 RAID-5 data placement scheme with parity will be used is the correct answer because vSAN 8 ESA uses adaptive RAID-5 erasure coding that depends on the number of hosts in the cluster. If the cluster has 6 or more hosts, vSAN will use a 4+1 RAID-5 scheme, where the data is written as a stripe of 4 data bits and 1 parity bit across 5 hosts. This provides a failure tolerance of 1 (FTT=1) and a space efficiency of 1.25x. If the cluster has less than 6 hosts (3 to 5), vSAN will use a 2+1 RAID-5 scheme, where the data is written as a stripe of 2 data bits and 1 parity bit across 3 hosts. This also provides a failure tolerance of 1 (FTT=1) but a space efficiency of 1.5x. In this case, the cluster has 5 hosts, so vSAN will use the 4+1 RAID-5 scheme.
The other options are incorrect for the following reasons:
A, vSAN will use a 2+1 RAID-5 data placement scheme with parity will be used, is incorrect because vSAN will only use this scheme if the cluster has less than 6 hosts but more than 2 hosts. In this case, the cluster has 5 hosts, so vSAN will use the 4+1 RAID-5 scheme.
B, RAID 5 will provide an FTT=2 level of protection in this case, is incorrect because RAID 5 can only provide an FTT=1 level of protection, regardless of the number of hosts or the data placement scheme.
To achieve an FTT=2 level of protection, vSAN would need to use RAID 6 erasure coding, which requires at least 6 hosts in the cluster.
D, vSAN will spread the components across all of the disk groups, is incorrect because vSAN will not necessarily spread the components across all of the disk groups in the cluster. vSAN will only spread the components across as many disk groups as needed to meet the storage policy requirements and to balance the load and capacity. In this case, vSAN will only need to spread the components across 5 disk groups for each stripe of RAID-5 data. References:
VMware vSAN Specialist v2 Exam Preparation Guide, page 11
Adaptive RAID-5 Erasure Coding with the Express Storage Architecture in vSAN 8
NEW QUESTION # 37
A six-node vSAN ESA cluster contains multiple virtual machines, and a vSAN storage policy with the rule
"Failures to tolerate" set to "1 failure - RAID-5 (Erasure Coding)" is assigned. A vSAN administrator has changed the rule in the assigned policy to "2 failures - RAID-6 (Erasure Coding)".
What is the result of this change?
- A. The policy change is rejected immediately.
- B. The updated policy is serially applied to the virtual machines.
- C. The changes are queued for 60 minutes.
- D. No changes occur until the policy is reapplied.
Answer: B
Explanation:
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
NEW QUESTION # 38
A vSAN administrator notices that the VMware Skyline Health: Network Latency Check reports indicate that three hosts are noncompliant.
Which action should the vSAN administrator take?
- A. Check VMKNICs, uplinks, physical switches, and associated settings
- B. Immediately reboot the non-compliant hosts
- C. Place the non-compliant hosts into an isolated network partition
- D. Rerun the VMware Skyline Health: vSAN Cluster Partition report
Answer: A
Explanation:
Explanation
The correct answer is B, check VMKNICs, uplinks, physical switches, and associated settings. This is because the VMware Skyline Health: Network Latency Check reports the network latency between vSAN hosts and displays the network latency in real time. Failure indicates that the network latency is above the normal threshold, which can affect the performance and availability of vSAN. The network latency can be caused by various factors, such as misconfiguration, congestion, or errors in the network components. The vSAN administrator should check the VMKNICs, uplinks, physical switches, and associated settings for any issues and resolve them accordingly. The vSAN administrator can also use tools such as vmkping or esxtop to test the network connectivity and performance between hosts. The other options are incorrect for the following reasons:
A, immediately reboot the non-compliant hosts, is incorrect because rebooting the non-compliant hosts is not a recommended action and can cause more disruption and data loss than resolving the network issue. Rebooting the hosts will also trigger a resynchronization of data across the cluster, which can affect the performance and availability of vSAN.
C, rerun the VMware Skyline Health: vSAN Cluster Partition report, is incorrect because rerunning the VMware Skyline Health: vSAN Cluster Partition report will not help to resolve the network latency issue. The vSAN Cluster Partition report checks if there are any network partitions in the cluster that prevent communication between hosts. The network partition can be caused by network latency, but it is not the same as network latency. The vSAN administrator should first fix the network latency issue before checking for any network partitions.
D, place the non-compliant hosts into an isolated network partition, is incorrect because placing the non-compliant hosts into an isolated network partition will not help to resolve the network latency issue.
It will also cause more problemsfor vSAN, such as data inconsistency, reduced redundancy, and degraded performance. The vSAN administrator should avoid creating any network partitions in the cluster and ensure that all hosts can communicate with each other. References:
VMware vSAN Specialist v2 Exam Preparation Guide, page 9
Network Health - Network Latency Check (2149511)
NEW QUESTION # 39
What is the maximum amount of capacity disks an administrator can have in disk groups on a single vSAN OSA host?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
Explanation
The maximum amount of capacity disks an administrator can have in disk groups on a single vSAN OSA host is 35. This is because a single host can have up to five disk groups, and each disk group can have up to seven capacity disks. Therefore, the maximum number of capacity disks per host is 5 x 7 = 35. The other options are not correct, as they are lower than the maximum number of capacity disks per host. References: Designing and Sizing vSAN Storage; [vSAN ReadyNode Hardware Guidance]
NEW QUESTION # 40
An administrator wants to assign a storage policy to a workload on a two-node vSAN OSA cluster consisting of three disk groups each with nested fault domains. The virtual machine must be protected against a disk or disk group failure.
Which two storage policies meet these requirements? (Choose two.)
- A. RAID-5/FTT 1
- B. RAID-1/FTT 1
- C. RAID-1/FTT 3
- D. RAID-6/FTT 2
- E. RAID-5/FTT 2
Answer: B,D
Explanation:
Explanation
To protect a virtual machine against a disk or disk group failure, the storage policy must have a failure tolerance method (FTM) of RAID-1 or RAID-6 and a failure to tolerate (FTT) value of at least 1. RAID-1 mirrors the data across multiple disk groups, while RAID-6 uses erasure coding to stripe the data and parity information across multiple disk groups. RAID-5 is not suitable for this scenario, as it can only tolerate one disk failure per stripe. FTT 2 or 3 would require more disk groups than available in the cluster.
Therefore, the correct options are C and E. References: 1, page 8; 2, section 3.1
NEW QUESTION # 41
In which type of environment is vSAN storage used as a mandatory, primary storage?
- A. VMware Horizon
- B. VMware Cloud on AWS
- C. TanzuKubernetes Grid Integrated Edition
- D. VMware Aria Automation
Answer: B
Explanation:
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
NEW QUESTION # 42
What is the purpose of the TRIM/UNMAP process?
- A. Collects vSAN log files
- B. Reclaims disk space
- C. Deletes orphaned snapshots
- D. Repairs internal cache errors
Answer: B
Explanation:
Explanation
The purpose of the TRIM/UNMAP process is to reclaim disk space that is no longer used by the guest operating system or the virtual machine. TRIM and UNMAP are commands that allow the guest operating system to inform the underlying storage layer that certain blocks are no longer in use and can be freed up. This process helps to improve storage efficiency and utilization,especially for thin-provisioned disks that grow dynamically as data is written to them. The other options are not correct. The TRIM/UNMAP process does not collect vSAN log files, repair internal cache errors, or delete orphaned snapshots. These are different tasks that are performed by other tools or processes. References: Enabling TRIM/UNMAP Commands for VMware Cloud on AWS Clusters; Reclaiming guest OS storage in VMware vSAN 6.7 U1 with TRIM/UNMAP process
NEW QUESTION # 43
vSAN requires that the virtual machines deployed on the vSAN datastores are assigned at least one storage policy, but the administrator did not explicitly assign a storage policy when provisioning the new VM.
What is the result of this situation?
- A. The VM objects will be protected based on the vSAN Default Storage Policy configurations.
- B. The vSphere Web Client will choose the last vSAN Storage Policy used.
- C. The VM provisioning will fail.
- D. No data protection will be applied to the VM objects.
Answer: A
Explanation:
Explanation
If the administrator did not explicitly assign a storage policy when provisioning a new VM on a vSAN datastore, the result is that the VM objects will be protected based on the vSAN Default Storage Policy configurations. The vSAN Default Storage Policy is assigned to all VM objects if no other vSAN policy is assigned when provisioning a VM. The default policy contains vSAN rule sets and a set of basic storage capabilities, such as Failures to tolerate set to 1, Number of disk stripes per object set to 1, and Thin provisioning. The other options are not correct. The VM provisioning will not fail, as vSAN requires that every VM has at least one storage policy. The vSphere Web Client will not choose the last vSAN Storage Policy used, as it will always apply the default policy if no other policy is selected. No data protection will not be applied to the VM objects, as they will have at least one replica based on the default policy.
References: About the vSAN Default Storage Policy; Using vSAN Policies
NEW QUESTION # 44
An administrator has been tasked with upgrading existing vSAN OSA cluster hosts with a SSD cache device per host to a NVMe device (hot plug).
Which fact should guide the administrator's action?
- A. The cache disk drives must have a larger capacity.
- B. The host must be removed from vSAN OSA cluster before changingcache devices.
- C. The disk group does not need to be removed before adding new cache.
- D. The disk groupmust be deleted on each physical host in the vSAN OSA cluster to use the NVMe device.
Answer: D
Explanation:
Explanation
The correct answer is A, the disk group must be deleted on each physical host in the vSAN OSA cluster to use the NVMe device. This is because vSAN OSA uses a disk group configuration where one disk is designated as a cache disk and the rest are capacity disks. To replace the cache disk with a different type or size, the disk group must be deleted first, which will erase all data on the disks and trigger a resynchronization of the affected objects. The administrator should put the host in maintenance mode and choose the option to evacuate all data before deleting the disk group. After replacing the cache disk with the NVMe device, the administrator should recreate the disk group and exit maintenance mode. The other options are incorrect for the following reasons:
B, the disk group does not need to be removed before adding new cache, is incorrect because adding a new cache disk to an existing disk group is not supported in vSAN OSA. The cache disk can only be replaced by deleting and recreating the disk group.
C, the host must be removed from vSAN OSA cluster before changing cache devices, is incorrect because removing the host from the cluster is not necessary and will cause more disruption and data loss than putting the host in maintenance mode. Removing the host will also delete its disk groups and require re-adding them after rejoining the cluster.
D, the cache disk drives must have a larger capacity, is incorrect because there is no requirement for the cache disk to have a larger capacity than the existing one. The cache disk size should be determined by the workload characteristics and performance requirements, not by the expansion process. References:
VMware vSAN Specialist v2 Exam Preparation Guide, page 10
NEW QUESTION # 45
A customer wishes to host a new range of applications with high-performance needs, specifically, low latency.
The applications are required to be hosted at company-owned edge locations, each with minimal rack space (three host slots per edge location for this project).
Which deployment options would satisfy the customer's needs, while maximizing the amount of capacity available per deployment?
- A. A new three-node vSAN 8.0 All-Flash Cluster with ESA in each edge location Each application VM configured with a RAID-5 VM storage policy
- B. A new three-node vSAN 8.0 All-Flash Cluster with ESA in each edge location Each application VM configured with a RAID-1 VM storage policy
- C. A new three-node vSAN 8.0 All-Flash Cluster with OSA in each edge location Each application VM configured with a RAID-5 VM storage policy
- D. A new three-node vSAN 8.0 All-Flash Cluster with OSA in each edge location Each application VM configured with a RAID-1 VM storage policy
Answer: D
Explanation:
Explanation
To satisfy the customer's needs for high-performance, low-latency applications at edge locations, the best deployment option is to use a new three-node vSAN 8.0 All-Flash Cluster with OSA in each edge location and configure each application VM with a RAID-1 VM storage policy. This option will provide the following benefits:
All-flash clusters offer the highest performance and lowest latency for vSAN, as they use flash devices for both cache and capacity tiers. Flash devices have faster read and write operations than magnetic disks, and they also support advanced features such as deduplication, compression, and encryption.
OSA stands for One Socket Architecture, which means that each host has only one CPU socket with multiple cores. This reduces the licensing cost and complexity of vSphere and vSAN, as well as the power consumption and cooling requirements of the hosts. OSA also improves the performance of vSAN by eliminating the NUMA effect, which is the latency caused by accessing memory or devices across different CPU sockets.
RAID-1 is a mirroring technique that creates two copies of each data component and places them on different hosts. This provides high availability and fault tolerance for the application VMs, as they can survive the failure of one host or disk. RAID-1 also offers better performance than RAID-5 or RAID-6, as it does not incur any parity overhead or additional write operations.
The other options are not optimal for the customer's needs, as they either sacrifice performance or capacity.
Option A uses RAID-5, which is an erasure coding technique that splits each data component into three data segments and one parity segment, and distributes them across four hosts. This reduces the capacity consumption by 25%, but it also increases the write latency and network traffic, as each write operation requires four hosts to participate. Option C uses ESA, which stands for Enterprise Storage Architecture, which means that each host has two CPU sockets with multiple cores. This increases the licensing cost and complexity of vSphere and vSAN, as well as the power consumption and cooling requirements of the hosts.
ESA also introduces the NUMA effect, which can degrade the performance of vSAN by adding latency to access memory or devices across different CPU sockets. Option D uses RAID-5 with ESA, which combines the disadvantages of both options A and C.
NEW QUESTION # 46
......
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