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| Section | Objectives |
|---|---|
| Data Protection and Backup Integration | - Snapshot Management - Backup Solutions Integration |
| Disaster Recovery Fundamentals | - DR Concepts (RPO, RTO, SLAs) - Business Continuity Principles |
| Recovery Operations | - Recovery Plans and Orchestration - Test Recovery Workflows - Failover and Failback Procedures |
| Prism Central Management | - Cluster and Site Management - DR Monitoring and Operations |
| Nutanix Disaster Recovery Architecture | - Nutanix Leap Overview - Replication Types (Sync/Async) - Protection Domains |
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質問 # 33
A VM is protected in an Async Protection Policy with a schedule for every 1 hour. The replications are completing successfully every hour. The VM hosts a critical application and cannot afford any data loss. The administrator unprotects the VM from the Async Policy and protects the VM in a Synchronous policy. The administrator also notices that the VM is not entering the " Sync " state and is stuck in syncing for a long time. The administrator notices the error in the logs:
Enabling stretch for entity TestVM failed while notifying vm service due to error Acropolis failed to handle VmSyncRepEnable request for VM TestVM Failed to connect to remote Anduril What port needs to be allowed between the clusters to fix the issue?
正解：B
解説：
In a Nutanix environment, Synchronous replication (including Metro Availability and Synchronous Protection Policies) relies on a specialized service known as Anduril to manage the real-time mirroring and state transitions of virtual machines. While standard asynchronous replication primarily uses ports 2009 (Stargate) for data transfer and 2020 (Cerebro) for metadata and replication management, synchronous replication introduces additional requirements for low-latency communication between the Anduril services on the source and destination clusters.
The error message " Failed to connect to remote Anduril " specifically indicates that the local cluster ' s management plane is unable to communicate with the remote cluster ' s synchronous replication manager.
TCP port 2036 is the dedicated port for cross-cluster communication between Anduril services. This port is used to negotiate the " stretch " of the VM across sites, coordinate the initial sync, and maintain the health heartbeat required for high-availability failover decisions. If port 2036 is blocked by a physical or virtual firewall between the clusters, the " VmSyncRepEnable " request will time out or fail, preventing the VM from ever entering the " Sync " (Active-Active) state. Troubleshooting synchronous replication always begins with verifying that the 5ms latency requirement is met and that port 2036 is open alongside the standard ports 2009 and 2020 to ensure both data and control traffic can flow without interruption between availability zones.
質問 # 34
An administrator performed an unplanned failover from AZ1 (primary) to AZ2 (recovery). Later, AZ1 is restored and the administrator wants to fail back the entities to AZ1. Which two statements are correct?
(Choose two.)
正解：B、D
解説：
Nutanix Disaster Recovery is designed to be bi-directional, supporting both failover and failback . In an unplanned failover, the primary site (AZ1) is assumed to have crashed. Once AZ1 is brought back online, the system must synchronize any data changes that occurred while the VMs were running at AZ2.
Statement C is correct because once the VMs are powered on at AZ2, the Nutanix Cerebro service automatically reverses the protection policy. New recovery points are created at AZ2 and replicated back to AZ1. For a successful, modern failback with zero data loss from the cloud session, the administrator must wait for these recovery points to replicate back to AZ1 before initiating the failback.
Statement B is also correct and describes a specific " recovery of last resort " scenario. If AZ1 is restored but connectivity to AZ2 is permanently lost (e.g., the cloud provider has an issue), an administrator can still " Unplanned Failover " back to AZ1 using the historical snapshots that existed locally on AZ1 before the original outage. This would result in data loss equal to the time the VMs were running at AZ2, but it allows for service restoration when the recovery site itself fails. These two statements highlight the flexibility of the Nutanix DR architecture in handling both controlled failback and emergency local restoration.
質問 # 35
An administrator is migrating from a Protection Domain-based deployment to a Prism Central (PC)-based deployment. What occurs if a snapshot is deleted before the protection policy is applied to the migrated entities?
正解：C
解説：
Migrating from legacy Protection Domains to modern Prism Central Protection Policies involves transitioning the management of virtual machine snapshots. During this process, the historical snapshots created by the Protection Domain are often intended to be " claimed " or utilized by the new PC-based system as valid recovery points.
Snapshots are point-in-time references to data on the storage tier. If a snapshot is deleted from the cluster before the migration to Protection Policies is finalized, the underlying data blocks associated with that specific point in time may be reclaimed by the system ' s garbage collection process. Consequently, the recovery points that were associated with that deleted snapshot will no longer be available for use within the new deployment. The system cannot " automatically recreate " (Option A) a deleted snapshot because the exact historical state of the data is lost once the snapshot is purged. The migration itself typically continues for the remaining valid data, but the loss of historical recovery points could impact the business ' s ability to restore to specific past dates. This highlights the importance of data retention awareness during management-plane migrations.
質問 # 36
Which file system is supported on Linux VMs for Self-Service Restore?
正解：A
解説：
Nutanix Self-Service Restore (SSR) allows end-users to recover files from snapshots without needing assistance from a cluster administrator. This functionality is enabled by Nutanix Guest Tools (NGT), which mounts a snapshot disk to the guest VM. For SSR to function, the Nutanix Guest Agent (NGA) must be able to recognize and mount the file systems present on the snapshots.
For Linux-based virtual machines, Nutanix SSR supports standard, modern journaling file systems. EXT4 is the most widely supported and common file system used across modern Linux distributions like RHEL, CentOS, and Ubuntu, and it is natively supported by the Nutanix SSR agent. While other file systems like XFS or older EXT versions might be supported by the OS itself, EXT4 is the primary validated target for SSR operations. NTFS (Option B) is primarily a Windows file system, though it can be mounted on Linux, it is not the native standard for Linux SSR. Supporting the native file system of the guest OS is critical because it ensures that file permissions and ownership (UID/GID) are preserved during the recovery process. This compatibility allows users to seamlessly mount the snapshot, navigate to the required directory, and restore deleted or corrupted files directly to their production environment.
質問 # 37
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?
正解：B
解説：
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.
質問 # 38
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