5V0-21.21 Exam questions (90-100) vSAN考试题目

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2024-02-07
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To study for VMware HCI Master Specialist Exam | vSAN认证考试题目学习

95. An administrator is reviewing the root cause analysis of a failure event that resulted in vSAN Data Loss. The following information is known about the event：

1.The RAID battery-replacing procedure on one of the first vSAN cluster node took much more time than the vSAN administrator predicted.
2.The only Storage policy has a Primary level of Failures To Tolerate=1.
3.Whilst the first host was in maintenance mode, another node failure occurred, causing data loss in the vSAN cluster.

The administrator needs to update the procedure for completing maintenance on the cluster.

Which Maintenance Mode option should the administrator choose to ensure that data loss does not occur in the future?

A.No data migration
B.Ensure accessibility
C.No data migration with selected option ‘Move powered-off and suspended virtual machines to other hosts in the cluster’
D.Full data migration

Explaination:

In a VMware vSAN environment, when performing maintenance activities that require a host to enter maintenance mode, it’s crucial to select the right maintenance mode option to prevent data loss, especially in scenarios where the cluster’s fault tolerance is challenged. Given the situation where a RAID battery replacement took longer than expected and a subsequent node failure occurred during maintenance, leading to data loss, it’s evident that the cluster’s resilience needs to be improved during such operations.

Here are the options and the best choice based on the provided scenario:

A. No data migration: This option does not migrate any data from the host entering maintenance mode. It’s the quickest option but the riskiest, especially in a cluster with a Primary level of Failures to Tolerate (FTT) = 1. If another host fails or experiences issues while the first host is in maintenance mode, data loss can occur because there’s no redundancy for the data that was only on the host that is in maintenance.
B. Ensure accessibility: This option ensures that all data remains accessible even if a host is in maintenance mode, by migrating enough data to other hosts in the cluster so that all virtual machine objects meet their storage policy requirements. However, it may not provide full redundancy if another failure occurs, depending on the specific circumstances and the storage policy in place.
C. No data migration with selected option ‘Move powered-off and suspended virtual machines to other hosts in the cluster’: This option focuses on moving VMs that are not currently running but does not address the migration of data for running VMs. It’s a variation of option A with a slight enhancement for non-active VMs but still carries significant risk for data loss in scenarios like the one described.
D. Full data migration: This option migrates all data from the host entering maintenance mode to other hosts in the cluster. It ensures that all data is fully protected according to the vSAN storage policy settings, even if another host fails during the maintenance window. This is the safest option to prevent data loss but also the most time-consuming.

Given the scenario where a RAID battery replacement unexpectedly extended the maintenance window and was compounded by an additional node failure, leading to data loss, the best option to prevent such an event in the future is:

D. Full data migration

Choosing Full data migration ensures that all data is fully replicated across the remaining active nodes in the cluster, maintaining adherence to the storage policy’s primary level of Failures to Tolerate (FTT) settings. This approach provides the highest level of protection against data loss during maintenance activities, especially in environments where unexpected delays or additional failures might occur.