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?
Correct Answer:
D
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
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?
Correct Answer:
D
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
A vSAN administrator encounters a non-compliant virtual machine and the compliance status of some of its objects is noncompliant. vSAN is able to locate a full replica of 55% of the votes for the noncompliant objects.
What will vSAN do with the virtual machine?
Correct Answer:
A
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
What are two prerequisites for using the TRIM and UNMAP capability of vSAN? (Choose two.)
Correct Answer:
BD
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.
Due to a planned power outage, an administrator decides to shut down the vSAN cluster using the Shutdown Cluster Wizard. The administrator starts by checking the vSAN health service to confirm the cluster is healthy and then powers off all virtual machines (VMs) including vCLS VMs.
Which step needs to be taken before starting the Shutdown Cluster Wizard?
Correct Answer:
C
To shut down the vSAN cluster using the Shutdown Cluster Wizard, the administrator needs to turn off High Availability (HA) before starting the wizard. This is because HA monitors the cluster for host failures and attempts to restart the affected VMs on other hosts. If HA is not turned off, the cluster might register host shutdowns as failures and trigger unnecessary VM restarts, which can interfere with the graceful shutdown process. Therefore, the administrator should disable HA from the Configure tab of the cluster before using the Shutdown Cluster Wizard12 References: 1: Shut Down the vSAN Cluster Using the Shutdown Cluster Wizard 3 2: Manually Shut Down and Restart the vSAN Cluster 4