VMware 5V0-22.21 Practice Test - Questions Answers, Page 9

According to the VMware official documentation, Lifecycle Manager (vLCM) provides an automated and consistent approach to deploying and updating vSAN clusters, including firmware and driver updates. vLCM enables administrators to upgrade a 4-node vSAN cluster from version 7.0 to the latest version available as a single task, using vLCM images within Lifecycle Manager in vCenter. This ensures that the process is done quickly and reliably, without manual intervention or additional steps.

https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-esxi-vcenter-server-7-vsphere-withtanzu-release-notes.html

VMware vSphere with Tanzu Release Notes

https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-esxi-vcenter-server-7-vsphere-withtanzu-release-notes.html

According to the VMware official documentation, this is the recommended disk group configuration for maximizing the amount of vSAN cache available and providing better storage performance for development workloads. This configuration allows for more capacity and flash devices to be used, increasing the amount of available cache and providing more storage options. Additionally, this configuration allows for more flexibility in the sizing of the capacity tier, allowing the administrator to adjust the size of the capacity tier to best suit the needs of the workloads.

When a node is lost in a vSAN cluster, the vSAN will automatically begin to rebuild objects in order to meet the storage policy compliance. However, if the storage policy includes RAID-5 with a "Failures to Tolerate" (FTT) value of 2, it won't be possible to rebuild the objects and meet the storage policy compliance with only 5 nodes. In this case, the vSAN administrator needs to change the RAID-5 FTT from 2 to 1, this will allow the vSAN to rebuild the objects and meet the storage policy compliance with only 5 nodes. With RAID-5, the FTT value of 1 is the minimum value supported by vSAN.

This is explained in VMware vSAN documentation in the section "RAID-5 and RAID-6 Erasure Coding"

Reference: https://docs.vmware.com/en/VMware-vSphere/7.0/vsphere-vsan-70-config-guide/GUID-1A5F48D5-F8C9-4C7E-9D9B-F9D4B4E4A4F4.html

Changing the RAID-5 FTT from 2 to 1 will ensure that the virtual machines on the vSAN datastore arein compliance with the storage policy. This is because, with a RAID-5 FTT of 2, the cluster needs at least 6 nodes to meet the redundancy requirements. With a single node lost, the cluster cannot meet this requirement and so the virtual machines on the datastore will be out of compliance. By changing the FTT from 2 to 1, the cluster will be able to meet the redundancy requirements with only the remaining 5 nodes, ensuring compliance with the storage policy. Reference:

https://docs.vmware.com/en/VMwarevSphere/7.0/com.vmware.vsphere.troubleshooting.doc/GUID-F7A0FECC-E95E-4A89-B3B3-9699D9F7D87D.html

The esxcli system command that will place a vSAN host into maintenance mode using the "Ensure Accessibility" option is: #esxcli system maintenanceMode set -enable true -e ensureObjectAccessibility true This command will put the host into maintenance mode and ensure that all objects are accessible and compliant with the storage policy. This option should be used when performing maintenance or upgrades on a vSAN host. This command is explained in VMware vSAN documentation in the section "Maintenance Mode for vSAN" Reference: https://docs.vmware.com/en/VMwarevSphere/ 7.0/vsphere-vsan-70-admin-guide/GUID-7E8F6C98-7C0B-4D21-8F1A-F3A3A9F4F4A4.html

The TRIM and UNMAP capability of vSAN is used to reclaim space on an all-flash vSAN cluster by discarding blocks that are no longer in use. In order to use this capability, the following prerequisites must be met:

The VM guest operating system must support the ATA TRIM or SCSI UNMAP command. This will allow the guest OS to communicate with the vSAN datastore to inform it of blocks that are no longer in use.

The vSAN cluster must be an all-flash architecture. TRIM and UNMAP can only be used on all-flash vSAN clusters, as it doesn't make sense on the hybrid vSAN cluster.

This is explained in VMware vSAN documentation in the section "vSAN Space Reclamation"

Reference: https://docs.vmware.com/en/VMware-vSphere/7.0/vsphere-vsan-70-admin-guide/GUID-7E8F6C98-7C0B-4D21-8F1A-F3A3A9F4F4A4.html

This is explained in VMware vSAN documentation in the section "vSAN Tools and Troubleshooting"

Reference: https://docs.vmware.com/en/VMware-vSphere/7.0/vsphere-vsan-70-admin-guide/GUID-7E8F6C98-7C0B-4D21-8F1A-F3A3A9F4F4A4.html

Reference: https://docs.vmware.com/en/VMwarevSphere/7.0/com.vmware.vsphere.vsan.doc/GUID-9F9ED2CB-8F62-4C1B-A7E2-3B8FA3FCCD77.html

HCI Mesh allows you to connect two or more vSAN clusters together in a stretched cluster configuration, which enables you to share storage resources across the clusters. In order to implement HCI mesh between two clusters that are located in geographically separate data centers, the vSAN administrator should ensure that both Layer 2 and Layer 3 communications are supported between the two data centers. This will allow the vSAN clusters to communicate with each other over both the data and management networks.

This is explained in VMware vSAN documentation in the section "HCI Mesh" Reference:

https://docs.vmware.com/en/VMware-vSphere/7.0/vsphere-vsan-70-admin-guide/GUID-7E8F6C98-7C0B-4D21-8F1A-F3A3A9F4F4A4.html

Each site in the stretched cluster is configured as a fault domain. Fault domains are used to spread redundancy components across servers. In a traditional vSAN cluster, redundant components are spread across servers in separate computing racks, and as a result, can tolerate rack failures, cache and capacity device failures, network device failures, and power failures. When used in a stretched cluster, fault domains spread redundancy components across sites, and therefore can tolerate the failure of an entire data site. The minimum number of hosts in a stretched cluster is three, one host in each data site plus the witness host in the witness site. The maximum number of hosts in a stretched cluster is 31, fifteen hosts in each data site plus the witness host in the witness site.