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| Section | Objectives |
|---|---|
| Data Protection and Backup Integration | - Snapshot Management - Backup Solutions Integration |
| Nutanix Disaster Recovery Architecture | - Nutanix Leap Overview - Protection Domains - Replication Types (Sync/Async) |
| Prism Central Management | - DR Monitoring and Operations - Cluster and Site Management |
| Disaster Recovery Fundamentals | - DR Concepts (RPO, RTO, SLAs) - Business Continuity Principles |
| Recovery Operations | - Recovery Plans and Orchestration - Test Recovery Workflows - Failover and Failback Procedures |
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질문 # 90
An administrator incorrectly used the " Activate " functionality on the PD to test failover of VMs from production to DR cluster. The VMs were successfully restored on the DR side. What steps are needed to clean up the VMs on the DR side and resume normal operations on the Production cluster?
정답：A
설명：
In Nutanix Disaster Recovery using Protection Domains (PDs), " Activate " is a high-level command used to promote a remote site to an active state. This is typically reserved for an unplanned failover scenario when the primary site is completely offline. If an administrator mistakenly uses " Activate " for a test instead of the proper " Test Failover " workflow, the secondary cluster will begin treating the replicated snapshots as active, live virtual machines. This process involves promoting the storage and registering the VMs to the local hypervisor.
To return to a steady state where the production cluster is the only active site, the administrator must perform a cleanup on the DR cluster. The " Deactivate " command on the DR cluster serves two main purposes: it changes the Protection Domain status from " Active " back to " Standby " and provides an option to " Destroy VMs " associated with that PD. Choosing to destroy the VMs on the DR cluster is essential to prevent duplicate VM instances or IP address conflicts when production resumes. Simply deleting the VMs manually (Option C) is insufficient because it does not reset the PD ' s metadata status in the Nutanix Cerebro service.
By deactivating the PD and destroying the VMs at the DR site, the administrator ensures that the DR site returns to its role as a passive replication target, allowing the primary production cluster to continue its operations without being impacted by the accidental activation.
질문 # 91
An administrator is testing the failover scenarios from a source availability zone (AZ1) to a destination availability zone (AZ2). The administrator successfully performs an unplanned failover from AZ1 to AZ2.
The administrator then immediately tries to use the unplanned failover option to fail the VM back to AZ1, but does not see the VM listed under Recovery Plan. What could be the cause?
정답：D
설명：
Failback is a critical phase of the disaster recovery lifecycle where workloads are returned to their original primary site. When an " Unplanned Failover " is executed, the system assumes the primary site is gone or unmanaged. Once the primary site (AZ1) is restored, the administrator cannot simply " re-run " the failover in reverse without preparing the source site. The " Clean up of Entities " (Option C) is a mandatory step that must be performed on the original primary cluster after it returns to a healthy state. This process clears the stale VM registrations and metadata that existed prior to the outage, signaling to the Nutanix orchestrator that AZ1 is now ready to re-receive the workloads. Until this cleanup is completed, the Recovery Plan will not list the VMs as eligible for failback because it still detects the " ghost " of the VM at the destination. While reverse replication (Option B) is also necessary to prevent data loss during failback, the reason the VMs are entirely missing from the Recovery Plan interface during the initial failback attempt is the lack of entity cleanup. Performing this cleanup ensures a smooth transition back to primary production without metadata conflicts or registration errors.
질문 # 92
An administrator configures a VM-VM Anti-Affinity policy for a web application cluster to ensure high availability. The application is protected by a Protection Policy in Prism Central. A failover occurs, moving the VMs to the recovery site.
What determines whether the VM-VM Anti-Affinity rules are active on the recovery site?
정답：C
설명：
VM-VM Anti-Affinity rules are used in Nutanix to ensure that specific virtual machines (such as the nodes of a database cluster or redundant web servers) never run on the same physical host, thereby protecting the application from a single host failure. These rules are typically managed through Prism Central (PC) in a modern deployment.
However, in the context of Disaster Recovery (DR) between two different clusters or availability zones, there is a technical limitation regarding the replication of these affinity policies. While the virtual machine ' s data and primary metadata (CPU, RAM, Disks) are replicated by the Cerebro service, the affinity rules are often considered local cluster constraints. In many versions of Nutanix Disaster Recovery (specifically the initial iterations of Leap/Prism Central-based DR), these affinity policies are not natively " synchronized " or enforced at the recovery site during a failover. This means that when the VMs are recovered at the destination cluster, the hypervisor ' s dynamic scheduler (ADS) may place them on the same host if that host has the most available resources. To maintain anti-affinity at the recovery site, an administrator would typically need to manually recreate the affinity policies at the destination AZ or use specialized orchestration scripts.
Understanding this limitation is vital for ensuring that high-availability requirements are still met after a disaster recovery event has occurred.
질문 # 93
How does the system behave if the network cannot sustain the data change rate required to maintain a 1- minute RPO between the primary and recovery AZs?
정답：C
설명：
Nutanix NearSync replication is designed to provide very low RPOs (1 to 15 minutes) by using " Lightweight Snapshots " (LWS). To maintain a 1-minute RPO, the system requires sufficient network bandwidth to transfer the delta changes before the next snapshot interval begins.
If the network bandwidth is insufficient or if the VM ' s data change rate (churn) suddenly spikes beyond the network ' s capacity to keep up, the system is designed to prioritize protection over RPO strictness. In this scenario, the Nutanix Cerebro service will automatically " downshift " the replication from NearSync to standard Asynchronous replication mode. This transition allows the system to use more traditional, robust snapshots that can handle longer transfer times, ensuring that the VM remains protected, even if the RPO temporarily increases to an hourly interval. Once the network conditions improve or the data churn decreases, the system will automatically attempt to " upshift " back to the 1-minute NearSync schedule. This behavior prevents application performance issues like write-pausing (Option D) or I/O degradation (Option A) and avoids unnecessary failovers (Option C), providing a resilient and adaptive data protection mechanism.
질문 # 94
An administrator intends to configure a NearSync replication schedule with a 15-minute Recovery Point Objective (RPO) on a hybrid 3-node cluster. The current nodes in the cluster are configured with one SSD and four HDDs each. Which cost-effective modification is required to support this specific replication schedule?
정답：B
설명：
Nutanix NearSync replication provides low RPOs (1 to 15 minutes) by using " Lightweight Snapshots " (LWS). NearSync has higher performance and hardware requirements than standard Asynchronous replication because it must handle metadata operations and data transfers much more frequently.
For a cluster to support NearSync, it must have sufficient high-performance storage to handle the additional I
/O load associated with LWS. On hybrid nodes (those with both SSDs and HDDs), Nutanix has a specific hardware requirement: each node must have at least two SSDs. This is because the NearSync LWS metadata and incoming replicated data are initially written to the SSD tier to ensure low latency and high throughput. A single SSD per node is typically insufficient to handle both active VM production I/O and the high-frequency NearSync overhead without performance degradation. Therefore, adding a second SSD to each node (Option D) is the mandatory modification. While upgrading to NVMe (Option A) or adding more nodes (Option B) would also improve performance, adding a second SSD is the minimum " cost-effective " requirement specified by Nutanix engineering for NearSync support on hybrid clusters. Meeting these hardware prerequisites is essential to ensure that the cluster can maintain the 15-minute RPO without transitioning back to an hourly schedule due to resource constraints.
질문 # 95
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