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| Section | Objectives |
|---|---|
| Topic 1: Nutanix Disaster Recovery Architecture | - Protection Domains - Nutanix Leap Overview - Replication Types (Sync/Async) |
| Topic 2: Data Protection and Backup Integration | - Backup Solutions Integration - Snapshot Management |
| Topic 3: Disaster Recovery Fundamentals | - Business Continuity Principles - DR Concepts (RPO, RTO, SLAs) |
| Topic 4: Recovery Operations | - Test Recovery Workflows - Recovery Plans and Orchestration - Failover and Failback Procedures |
| Topic 5: Prism Central Management | - DR Monitoring and Operations - Cluster and Site Management |
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105. Frage
A VM is configured with a 5-minute Nearsync RPO. After several hours, replication transitions back to hourly RPO. Alerts indicate the minute schedule cannot be maintained. What is the most likely root cause?
Antwort: B
Begründung:
Nutanix NearSync replication uses Lightweight Snapshots (LWS) to achieve RPOs as low as 1 minute. To maintain this aggressive schedule, the system must be able to replicate all the " delta " changes (the data that has changed since the last snapshot) within the RPO window. If the data change rate (churn) of the VM increases, or if the available network bandwidth decreases, the system may find that it cannot complete the replication of one LWS before the next one is due.
When the Nutanix Cerebro service detects that it is consistently missing its NearSync target, it will automatically " downshift " the replication to a standard Asynchronous schedule (typically hourly) to ensure that the VM remains protected at a manageable frequency. This is a self-healing mechanism designed to prevent replication jobs from stacking up and causing cluster instability. Insufficient bandwidth (Option D) is the most common cause for this downshift, as the " Snapshot-on-wire " cannot be moved fast enough to satisfy the 5-minute requirement. While high RTT (Option A) is a requirement for Synchronous replication, NearSync is designed to handle higher latencies (up to 80ms or more), making bandwidth the primary bottleneck in these troubleshooting scenarios.
106. Frage
An administrator recently expanded a Nutanix cluster by adding several new nodes. Shortly after, multiple backup jobs began failing. The following error is consistently reported: " Failed to perform backup: Cannot complete process ' iscsiadm --mode discovery --type sendtargets --portal X.X.X.X ' within timeout " . What is the most likely cause of the failure?
Antwort: D
Begründung:
Nutanix storage is often accessed by external backup solutions (like Veeam, Commvault, or HYCU) using the iSCSI protocol. This allows the backup server to mount snapshots and read data directly from the storage tier.
The error message " iscsiadm... discovery... timeout " specifically indicates that the backup server ' s iSCSI initiator is unable to communicate with the Nutanix Data Services IP or the Controller VMs (CVMs) over the network.
When a Nutanix cluster is expanded, it is essential that all networking and firewall configurations applied to the existing nodes are also applied to the new nodes. The iSCSI protocol relies on specific TCP ports: port
3260 is the standard port for iSCSI traffic, and port 3205 is often used for iSCSI discovery and metadata operations within Nutanix. If these ports are not open in the physical firewall or the host-based security rules for the newly added nodes, the backup server will be unable to discover the targets on those specific nodes, leading to the timeout errors . This highlights a common " Day 2 " operational trap: cluster expansion requires careful auditing of network security groups and firewall whitelists to ensure that external integrations- especially BCDR and backup services-continue to have uninterrupted access to the expanded storage fabric.
Verifying and opening ports 3205 and 3260 for the new node IPs is the first step to resolving this timeout issue.
107. Frage
Which log file should an administrator review to ensure consistent connectivity stability between primary and remote disaster recovery sites?
Antwort: A
108. Frage
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?
Antwort: D
Begründung:
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.
109. Frage
An administrator at a retail company is preparing to apply a critical OS security patch to a production SQL Server VM. Before starting, the administrator ensures the VM is part of a Protection Domain and manually creates a local snapshot (Recovery Point). Ten minutes after the patch is applied, the SQL service fails to start, and the database logs indicate corruption in the system registry. The administrator needs to return the VM to its functional state from ten minutes ago as quickly as possible. The administrator decides to perform a Restore from the local snapshot. Under which condition would an In-place Restore (Revert) fail, forcing the administrator to use the Clone (Out-of-place) option instead?
Antwort: C
110. Frage
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