Free D-AV-DY-23 sample questions

Correct answer: Both a forward (A) and a reverse (PTR) record

For proper operation, Avamar requires both forward (A) and reverse (PTR) DNS records for the utility node and all data nodes. The reverse lookup is critical for many internal services, replication, and system health checks to correctly identify nodes by their IP addresses. Missing PTR records is a common cause of post-installation issues.

Correct answer: A high rate of data change on the clients being backed up.

Garbage collection (GC) is responsible for deleting data chunks that are no longer referenced by any backup. A high rate of data change means that a large number of existing data chunks become unreferenced with each new backup. This increases the workload for the GC process as it has more expired data to identify and remove, leading to longer run times.

Correct answer: Source-side, variable-length deduplication

Avamar's key differentiator is its source-side, variable-length deduplication. The Avamar client agent on each remote office machine analyzes data, divides it into variable-sized chunks, and sends only new, unique chunks to the central Avamar server. This drastically reduces the amount of data transmitted over the slow WAN links, making it ideal for Remote Office/Branch Office (ROBO) scenarios.

Correct answers: VMDKs must be configured with Thick Provision Eager Zeroed.; Storage I/O Control (SIOC) must be disabled for the AVE datastore.

Dell mandates the use of Thick Provision Eager Zeroed for AVE virtual disks to guarantee performance. This format pre-allocates all disk space and zeroes it out upon creation, which eliminates I/O overhead associated with on-demand allocation and zeroing that occurs with other formats, preventing performance bottlenecks during heavy I/O operations like garbage collection.

It is a best practice and strong recommendation to disable Storage I/O Control (SIOC) on the datastore where the AVE resides. SIOC can throttle I/O, which may interfere with Avamar's own I/O-intensive internal processes like checkpoints and garbage collection, leading to performance degradation and potential system instability.

Correct answer: False

False. After a new node is successfully added to an Avamar grid, the system automatically begins to rebalance the data. New data chunks are preferentially written to the new, emptier node. Over time, garbage collection and stripe re-silvering processes will gradually migrate and redistribute existing data across all nodes, including the new one. No manual intervention is required to start this process.

Correct answer: Create one policy, add a schedule for the weekly full backup with a 30-day retention, and add a second schedule for the hourly log backup with a 14-day retention.

The Avamar policy framework is designed to handle this scenario efficiently. A single policy can contain multiple schedules, each with its own backup type (e.g., full, incremental, log), frequency, and retention period. This allows for the complete protection scheme for an application like SQL Server to be managed centrally within one policy.

Correct answer: Standard Asynchronous Replication

Standard asynchronous replication is Avamar's native feature for replicating backup data from a source grid to a destination grid. It can be scheduled to run frequently (e.g., every hour or more), easily meeting the RPO of less than 4 hours. The entire configuration and monitoring process is handled within the Avamar Web User Interface (AUI).

Correct answer: Hosting the Avamar management services and coordinating maintenance activities.

The utility node is the brain of the Avamar grid. It hosts critical services like the Management Console Server (MCS), provides the web UI, coordinates all maintenance tasks (checkpoints, garbage collection, HFS checks), manages metadata, and serves as the central point of administration.

Correct answer: Verify network switch port configurations for VLANs and speed/duplex settings.

Before powering on the ADS nodes, it is critical to verify that the customer's network switches are correctly configured. This includes ensuring the correct VLANs are assigned to the ports, and that speed and duplex settings are correctly configured (typically auto-negotiate, but must match requirements). Incorrect network settings are a primary cause of installation failures, and verifying them beforehand prevents lengthy troubleshooting.

Correct answer: Historical performance data and system logs from the Avamar server.

The Avamar Fitness Analyzer is a script-based tool that collects a comprehensive set of historical data from the Avamar server. This includes system logs, performance statistics (CPU, memory, I/O), capacity utilization trends, and configuration data. It then analyzes this information to produce a detailed report on the system's health, identify potential issues, and provide recommendations for optimization.