After a planned power outage, an administrator decided to restart the vSAN cluster manually.
What is the correct sequence of steps for the administrator to follow after powering on the ESXi hosts?
Correct Answer:
A
This is the sequence of steps recommended by VMware for manually restarting the vSAN cluster after a planned power outage. The steps are as follows:
✑ Enable cluster member updates from vCenter Server only on one ESXi host. This will allow the host to receive the latest cluster membership information from vCenter Server and avoid any conflicts or inconsistencies with other hosts. The command to enable cluster member updates is esxcfg-advcfg -s 1
/VSAN/IgnoreClusterMemberListUpdates.
✑ Run the python reboot helper script only on one ESXi host to recover the cluster.
This will prepare the cluster for a manual restart by partitioning the cluster and ensuring that all hosts have consistent metadata. The command to run the python reboot helper script is python /usr/lib/vmware/vsan/bin/reboot_helper.py prepare.
✑ Exit all hosts from maintenance mode. This will allow the hosts to resume normal operations and join the vSAN cluster. The command to exit maintenance mode is esxcli system maintenanceMode set -e false.
The other options are incorrect for the following reasons:
✑ B, exit all hosts from maintenance mode, run the python reboot helper script only on one ESXi host to recover the cluster, and enable cluster member updates from vCenter Server on all ESXi hosts, is incorrect because exiting all hosts from maintenance mode before running the python reboot helper script can cause data inconsistency or corruption, as the hosts may not have the latest metadata or cluster membership information. Enabling cluster member updates from vCenter Server on all ESXi hosts is also unnecessary and can cause conflicts or inconsistencies with other hosts.
✑ C, exit all hosts from maintenance mode, enable cluster member updates from vCenter Server only on one ESXi host, and run the python reboot helper script only on one ESXi host to recover the cluster, is incorrect because exiting all hosts from maintenance mode before running the python reboot helper script can cause data inconsistency or corruption, as the hosts may not have the latest metadata or cluster membership information.
✑ D, enable cluster member updates from vCenter Server on all ESXi hosts, run the python reboot helper script on all ESXi hosts to recover the cluster, and exit all hosts from maintenance mode, is incorrect because enabling cluster member updates from vCenter Server on all ESXi hosts is unnecessary and can causeconflicts or inconsistencies with other hosts. Running the python reboot helper script on all ESXi hosts concurrently can also cause a race condition that can result in unexpected outcomes.
References:
✑ Manually Shut Down and Restart the vSAN Cluster
✑ Restart the vSAN Cluster
A host in a vSAN stretched cluster goes offline during an unplanned event. Which action will be triggered from AQC on the vSAN cluster?
Correct Answer:
C
When a host in a vSAN stretched cluster goes offline, vSAN will use Adaptive Resync to recalculate the quorum on an object. Quorum is the minimum number of votes that an object needs to be available. For example, a RAID-1 object with two data components and one witness component needs two votes out of three to be available. If one data component goes offline, the object still has quorum and is available. However, if both data components go offline, the object loses quorum and is unavailable. Adaptive Resync will adjust the quorum requirement based on the availability of components and fault domains. For example, if one fault domain goes offline, Adaptive Resync will lower the quorum requirement to one vote out of two, so that the object can remain available with one data component and one witness component. References: VMware vSAN Specialist v2 EXAM 5V0-22.23, page 18
An administrator is performing maintenance on the hosts in a four-node vSAN cluster and has selected the "Ensure Accessibility" maintenance mode option. All VMs are running with the Default Storage Policy which has not been modified from the default settings.
While one of the hosts in the cluster is down for firmware upgrade, a second host suddenly loses network connectivity to the remaining hosts.
How will the cluster be affected?
Correct Answer:
A
If two hosts in a four-node vSAN cluster are down, the cluster might experience data loss because the default storage policy has a Primary level of failures to tolerate (PFTT) of 1, which means that vSAN can tolerate only one host failure. The Ensure accessibility maintenance mode option does not guarantee full data redundancy, but only ensures that all accessible VMs remain accessible. If another host fails while one host is in maintenance mode, some VMs might lose access to their data components and become unavailable or corrupted. References: vSAN Maintenance Mode Options; vSAN Cluster Configuration Limits
An administrator has 24 physical servers that need to be configured with vSAN. The administrator needs to ensure that a single rack failure is not going to affect the data availability. The number of racks used should be minimized.
What has to be done and configured to achieve this goal?
Correct Answer:
D
To ensure that a single rack failure is not going to affect the data availability, while minimizing the number of racks used, the administrator has to do the following:
✑ Distribute servers across at least three different racks. This is because vSAN supports up to three fault domains per cluster, which can be used to tolerate one or two failures. If only two racks are used, then only one failure can be tolerated4
✑ Configure three fault domains. A fault domain is a logical grouping of hosts that share a common failure point, such as a rack or a power supply. By configuring fault domains, vSAN can place replicas of an object across different fault domains, so that a failure within one fault domain does not result in data loss orunavailability4 References: 4: VMware vSAN Specialist v2 Exam Preparation Guide, page 13
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