Free D-AV-DY-23 Practice Test Questions and Answers (2026) | Cert Empire Practice Questions

Avamar design reserves 35 % of the total /data capacity for operating-system files, checkpoints, HFS checkpoints, and transient processing space. Only the remaining 65 % is available for user backup data.

A. 10 % is insufficient for OS and checkpoint activities.

B. 20 % does not meet Avamar’s default safety margin.

D. 50 % is larger than the default reservation and would unnecessarily limit user capacity.

1. Dell EMC Avamar Concepts and Architecture Guide 19.4, Table 4-1 “Capacity allocation”, p. 42.

2. Dell EMC Avamar System Administration Guide 19.4, §7.2 “Storage Overhead (35 %)”, p. 152.

3. Dell EMC Avamar Capacity Planning Best Practices, v18, p. 6.

The Avamar license file is bound to the hardware identifier of the utility node. Replacing the utility node chassis (moving its disks into new hardware) changes that identifier, so a fresh license key must be generated and installed.

B. Rebuild on the same utility node retains the original hardware ID, so no new key is required.

C. Storage-node rebuilds do not affect licensing, which is utility-node based.

D. Storage-node hardware IDs are not used for licensing; swapping them does not invalidate the license.

1. Dell EMC Avamar Administration Guide 19.3, “License management,” p. 36—license binds to utility-node hardware.

2. Dell EMC Avamar Node Replacement Procedures Guide 7.5, “Utility-node replacement,” step 14: “Obtain a new license file after chassis swap.”

3. Dell EMC KB 000496212 “When is a new Avamar license required?” sec. Utility Node.

When performing the initial installation and configuration of any Dell Avamar node, a set of basic network parameters is mandatory for it to communicate on the network. This essential set includes a static IP address, the corresponding subnet mask, the default gateway for routing to other networks, and DNS server addresses for name resolution. Additionally, a unique hostname and the network's domain name are required for proper identification and integration.

B. An SMTP server is for application-level email notifications and is not a fundamental requirement for basic network connectivity.

C. Duplex settings are link-layer parameters that are typically auto-negotiated and not part of the basic IP configuration set.

D. MTU size is a more advanced network setting, usually left at its default value unless specific network requirements like jumbo frames exist.

1. Dell Avamar Installation and Upgrade Guide, P/N 302-005-429 REV 02, Page 28, "Network information checklist". This checklist explicitly lists IP address, Netmask, Gateway, DNS Servers, and Hostname/Domain as required information.

A key advantage of Dell Avamar's deduplication technology is its ability to perform variable-length, sub-file deduplication. It breaks data streams into smaller, variable-sized chunks (data objects) and stores only the unique chunks. This method is highly effective at identifying redundant data not just between identical files, but also within different versions of the same file or even across completely different files that share common data blocks. This "sub-file" approach results in significantly higher deduplication ratios and lower storage consumption compared to file-level or fixed-block deduplication methods, which is a primary technological advantage.

A. This is false. Avamar relies on a robust catalog (metadata) to track backups, data chunks, and their relationships for restores.

B. Deduplication is a CPU-intensive process that reduces disk I/O; it does not inherently improve the physical speed of the disk drives themselves.

C. Storing data from multiple OS types is a feature of the backup system, not a unique advantage of its specific deduplication technology.

1. Dell Avamar 19.9 Administration Guide, Page 23, "How Avamar works". The document states, "Avamar divides the backup data into variable-length sub-blocks... This process is known as sub-block data deduplication."

2. Dell Technologies, "Dell EMC Avamar Fundamentals" Student Guide, Module 2: Avamar Concepts. This training material explains that Avamar's variable-length segmentation is a key advantage, allowing it to find more redundant data segments than fixed-block methods.

In a multi-node Dell Avamar grid, a spare node provides high availability and fault tolerance through a technology called RAIN (Redundant Array of Independent Nodes). The spare node remains in a standby state during normal operation. If an active data node in the grid experiences a hardware failure, the Avamar system automatically fails over to the spare node. The spare node is activated and integrated into the grid, and the data from the failed node is rebuilt onto it using the parity information distributed across the remaining data nodes. This ensures the grid remains operational and protected while the failed hardware is replaced.

A. The utility node has dedicated management functions and is not load-balanced by a spare node.

B. Capacity is grown by adding new data nodes to the grid, not by activating a standby spare node.

D. An NDMP accelerator is a specialized node type for backing up NAS devices and is distinct from a general-purpose spare node.

1. Dell Avamar 19.9 Administration Guide, Page 26, "RAIN". The guide explicitly states, "If a data node fails, a spare node, if configured, automatically replaces the failed node. The system rebuilds the data from the failed node on the spare node by using the RAIN parity information."

2. Dell Avamar Server and Data Store Hardware Information Guide, "Node types" section. This document describes the roles of different nodes, defining the spare node's purpose as a standby component for RAIN protection to replace a failed data node.

An HFS check (hfscheck) is a critical Avamar maintenance task that validates the integrity of the most recent checkpoint. A checkpoint is a consistent, point-in-time snapshot of the Avamar server's metadata and deduplicated data. The hfscheck process verifies that all data stripes referenced by the checkpoint exist and are valid, ensuring that the backups contained within that checkpoint are recoverable. It is a read-only consistency check that is fundamental to guaranteeing the reliability and integrity of the Avamar grid's data store.

B. A checkpoint rollback is a separate, distinct recovery procedure used to revert the server to a previous valid checkpoint; an HFS check only validates, it does not perform a rollback.

C. A checkpoint is the Avamar term for a server snapshot. The HFS check validates an existing checkpoint; it does not create a new one.

D. The HFS check is a software-level data integrity check of the Avamar file system, not a hardware-level diagnostic for RAID controller errors.

1. Dell Avamar 19.4 Administration Guide, Page 318, "About integrity checks". The guide explicitly states: "A checkpoint validation (hfscheck) validates the integrity of the most recent checkpoint. It confirms that all the stripes that are referenced by the checkpoint exist and are valid."

2. Dell Avamar 19.4 System Administrator Guide, Page 29, "Maintenance window tasks". This section lists "hfscheck (checkpoint validation)" as a scheduled maintenance activity, describing its purpose as verifying data consistency.

The Dell Avamar Virtual Edition (AVE) benchmark process is a mandatory post-installation step designed to validate the performance of the underlying storage subsystem. It runs a series of I/O tests to measure throughput and latency, ensuring the datastore where the AVE virtual disks reside can meet the stringent performance demands of Avamar's deduplication workload. Failure to meet these specifications can lead to poor backup performance, failed jobs, and system instability.

B. Memory availability is verified during the virtual machine creation and deployment process, not by the storage benchmark tool.

C. Available storage capacity is checked during deployment and monitored by Avamar services, but it is not the purpose of the performance benchmark.

D. CPU speed is verified by checking the hypervisor's resource allocation and reservation settings, not by the I/O-focused benchmark process.

1. Dell Avamar Virtual Edition 19.9 Installation Guide, Page 31, "Run the Avamar Virtual Edition benchmark". The section states, "The benchmark process verifies that the performance of the disk storage meets specifications."

Avamar controls retention for backups that reside on a connected Data Domain. When a backup expires or is manually deleted in Avamar, the Avamar server issues a deletion notification; the corresponding data on the Data Domain is simply marked “eligible for deletion.” Actual space reclamation occurs later during the Data Domain cleaning process.

B. Data is not immediately erased; it is only flagged.

C. Expiration does not trigger replication.

D. Cleaning is a periodic Data Domain task, not started automatically by each Avamar expiration.

1. Dell EMC Avamar 19.4 and Data Domain System Integration Guide, p.29 “Expired backups are marked for deletion on the DD; space is reclaimed at next clean.”

2. Dell EMC Data Domain Operating System 7.x Administration Guide, §“File Deletion and Cleaning,” p.75.

A Gen4 single-node Avamar Data Store is built on a Dell PowerEdge R720xd chassis that contains four integrated 1-GbE network interface ports. Two ports are cabled for production traffic; the remaining two may be used for management or replication.

A. Gen4S chassis provides twice that number.

C. Hardware offers only four on-board ports, not six.

D. Eight Ethernet ports are available only on multi-node shelves with additional NIC cards.

1. Dell EMC Avamar Gen4S Data Store Hardware Installation Guide Rev A07, Figure 3 “Rear view – ports” & Table 2 (p. 11).

2. Dell EMC Avamar System Integration Guide 7.5, “Network cabling for single-node systems,” p. 22.

3. Dell EMC Avamar Gen4S Specification Sheet, “Network interfaces: 4×1 GbE.”

The fundamental principle of Dell Avamar's deduplication is to ensure data efficiency by storing only one copy of any given data object. The system breaks down files into variable-length data chunks, calculates a unique hash for each chunk, and compares it to the hashes of chunks already stored. If a chunk is unique, it is stored on the Avamar server. If it already exists, only a pointer to the existing chunk is saved, not the data itself. This process ensures that each unique data object is physically stored only once across the entire system, significantly reducing storage capacity requirements.

A. This is too generic; while deduplication impacts disk usage, its primary goal is data reduction, not optimizing physical disk characteristics like RAID does.

B. Platform independence is a feature of the overall Avamar system, not a direct accomplishment of the deduplication process itself.

D. Data integrity and DR are outcomes of the entire backup solution. Deduplication is a component that enables this, but its direct function is data reduction.

1. Dell Avamar 19.9 Administration Guide, Page 23, "How Avamar works". The guide states, "Avamar uses a patented global deduplication technology to identify and store redundant data sub-blocks only once globally."

2. Dell Technologies, "Dell EMC Avamar: Data Protection and Recovery" Solution Brief, Page 2, "How it Works". It describes the process: "If the data segment is unique, it is compressed, encrypted and moved to the Avamar server. If the data segment already exists... only a pointer is sent to the server."

The hardware installation portion of an Avamar multi-node deployment concludes with connecting the system to the customer's network. The preceding steps involve racking the components, cabling them internally for power and the private network, powering them on, and configuring the internal switches. Only after the internal grid is physically assembled, powered, and its private network is configured, is it then connected to the external customer network for operational use and management access.

B: Cabling nodes to the internal switch is an intermediate step performed after racking and before powering on the system.

C: Powering on the nodes occurs after all physical racking and internal cabling is complete but before final network integration.

D: Configuring the internal switches is done after power-on but before the system is connected to the wider customer network.

- Dell EMC Avamar Data Store Gen4S and Gen4T Single Node and Multi-Node Installation Guide (P/N 302-003-911 REV 05), Page 18, "Installation workflow". The workflow diagram clearly shows "Connect to customer network" as the final step of the hardware and network setup phase, occurring after racking, cabling, and power-on.

Dell Avamar provides flexible and granular restore capabilities. Users can restore data at multiple levels of the file system hierarchy. This includes recovering a single file that was accidentally deleted, restoring an entire directory to a previous state, or performing a full bare-metal recovery of a complete file system or volume. This flexibility allows administrators to choose the most efficient recovery method based on the specific data loss scenario, minimizing downtime and impact. The restore process can be initiated through various interfaces, including the Avamar Administrator GUI or the client-side interface.

A. This is incorrect. Avamar is not limited to restoring only directories; it can restore individual files within them.

B. This is incorrect. Avamar can restore entire directories and file systems, not just individual files.

D. This is incorrect. Limiting restores to only full file systems would make Avamar impractical for common data recovery scenarios.

1. Dell Avamar 19.9 Administration Guide, Page 301, "Restoring client data". The section details the procedure for browsing backups and selecting items for restore, showing options for files, folders, and entire systems.

2. Dell Avamar for Windows Server 19.9 User Guide, Page 49, "Restoring data with the Avamar client". The guide illustrates the user interface, which allows browsing and selecting "individual files and folders" or entire drives for restoration.

The file cache on an Avamar client stores metadata hashes of previously backed-up files. During a backup, if a file's current metadata does not match an entry in the file cache (a cache miss), Avamar considers the file new or modified. Consequently, the file is not skipped. Instead, it must be fully processed by the avtar agent, which involves reading the file, breaking it into variable-sized chunks, and hashing those chunks for deduplication against the server.

A. An "is present" call is made to the server for data chunks that miss the local chunk cache, which is a subsequent step after the file is processed.

B. A cache miss leads to more data being processed, which could result in more unique chunks being compressed and sent to the server, not fewer.

D. Increased memory swapping is a potential system performance issue, not a direct and required step in the Avamar backup process following a cache miss.

1. Dell Avamar Technical Description and Considerations (Version 7.5), Page 15, "File cache" section. The document explains, "If a file is not in the file cache, avtar reads the file, divides it into variable-size data chunks..." This confirms the file is processed.

2. Dell Avamar Administration Guide (Version 19.4), Page 33, "The backup process" section. This section details the workflow where files are first checked against the file cache before being chunked.

Dell Avamar Virtual Edition (AVE) performance is highly dependent on I/O throughput. Using thin provisioned disks introduces latency, especially on first write to a new block, as space must be allocated and zeroed on demand. This leads to inconsistent and degraded performance compared to the recommended thick provision eager zeroed configuration. Consequently, any performance benchmarks conducted on a thin-provisioned AVE will not reflect the system's true capabilities in a properly configured production environment, rendering the results inaccurate for capacity and performance planning.

B. Avamar capacity is determined by the AVE license and configuration (e.g., 0.5 TB, 1.0 TB), not the underlying virtual disk provisioning type.

C. Thin provisioning generally results in slower, not faster, disk performance for I/O-intensive applications like Avamar due to the overhead of on-demand allocation.

D. The virtual disk provisioning method has no direct impact on the virtual machine's memory (RAM) requirements, which are determined by the AVE size.

1. Dell Avamar Virtual Edition 19.7 Installation and Upgrade Guide, Page 23, Note: "For production environments, use the Thick Provision Eager Zeroed format for the virtual disks. Using other formats can cause severe performance degradation."

2. Dell EMC Avamar Virtual Edition 19.4 Installation and Upgrade Guide, Page 15, Note: "For production environments, use the Thick Provision Eager Zeroed format for the virtual disks. Using other formats can cause severe performance degradation."

To achieve the highest level of data deduplication, a Guest-level backup is the recommended method. This involves installing the Avamar agent directly inside the guest operating system of the virtual machine. The agent operates at the file level, intelligently identifying and backing up only used data blocks while ignoring empty space, temporary files, and swap files. This file-level awareness allows Avamar to find more commonality across different VMs (e.g., shared OS files and applications), resulting in superior deduplication rates compared to image-level methods that process the entire virtual disk block by block.

A. ESX Console backup is not a standard Avamar backup method for virtual machines.

C. vSphere Image backup is an image-level method. While efficient, it typically yields lower deduplication rates than in-guest backups because it processes the entire VMDK.

D. VCB Image is an outdated VMware backup framework (VMware Consolidated Backup) that has been replaced by VADP, which is used by vSphere Image backups.

1. Dell Avamar 19.9 for VMware User Guide, Page 18, "Guest-level and image-level backups". The document states, "Guest-level backups can provide higher deduplication rates than image-level backups because the backup occurs within the guest operating system."

When configuring an Avamar node using the text-based YaST utility, particularly over a serial console or certain remote management tools, the Backspace key may not function as expected due to terminal emulation differences. In these standard Linux/Unix environments, the Ctrl-h key combination sends the ASCII backspace control character (^H), which correctly performs the backspace action within the YaST interface. This is a common and documented workaround for this specific setup scenario.

B. Ctrl-b is a standard shortcut for moving the cursor back one character without deleting, not for backspacing.

C. The Backspace key is the intended key, but the premise of the question implies a common scenario where it does not work correctly.

D. Ctrl-c is the standard command to send an interrupt signal, which typically terminates the current process, rather than performing a backspace.

1. Avamar Post-Installation and Upgrade Tasks Technical Note (P/N 302-002-276), Page 11, "Configuring network settings with yast". The document explicitly states, "If the Backspace key does not work, use Ctrl+h."

2. SUSE Linux Enterprise Server 11 Administration Guide, Section 3.1.1, "Navigation in Modules". Mentions keyboard navigation for ncurses-based YaST interfaces, where control characters like Ctrl-h have defined functions.

When an Avamar server enters read-only mode, it's protecting data from potential corruption. Before performing any expansion operations like "Add Node," the system must be in a known good controlled state. This ensures all data is verified, consistent, and the system health is confirmed. Adding nodes while in read-only mode or other compromised states could propagate issues across the expanded grid, risking data loss or corruption.

B. Read-only state prevents write operations and indicates potential issues that must be resolved first.

C. Steady state is a general operational condition but doesn't guarantee data integrity verification required before expansion.

D. Suspended state would halt operations entirely and isn't suitable for performing administrative tasks.

1. Dell EMC Avamar 19.x Administration Guide, Chapter 7 "System Maintenance," Section "Grid Expansion Prerequisites," pp. 234-237

2. Dell EMC Avamar Best Practices Guide, Section 4.3 "Pre-expansion Health Checks," Document #H17105, pp. 89-92

3. Dell Technologies Avamar Deployment Planning Guide, Chapter 5 "Node Addition Procedures," Rev. 03, pp. 156-158

4. EMC Avamar Operational Best Practices Technical Note, Section "System State Requirements for Grid Operations," Document #H16892.2, pp. 45-47

5. Dell EMC Avamar Troubleshooting Guide, Chapter 9 "Read-Only Mode Recovery," Version 19.x, pp. 312-315

The Avamar agent service (avagent) is responsible for all communication between the Avamar client and the Avamar server's utility node. It handles registration, workorder requests, and status updates. The avagent.log file, located in the client's avs/var directory, is the primary source for troubleshooting initial connection problems, authentication failures, or any general communication errors between the client and the server before a specific backup or restore job begins.

B. COD-workorder-Windows.log is a client-on-demand workorder log, detailing the specifics of a user-initiated backup job, not general agent-to-server communication.

C. MOD-workorder-Windows.log is a management-on-demand workorder log for scheduled backups initiated by the server, not for general communication issues.

D. err.log is a generic error log that may contain some information, but avagent.log is the specific and most detailed log for agent communication.

1. Dell Avamar Administration Guide, Version 7.5, P/N 302-002-133, Page 599, Table 151 "Client logs": Describes avagent.log as the log for the Avamar client agent service, which listens for backup/restore requests from the Avamar server.

2. Dell Avamar Technical Addendum, Page 11, "Client Logs": States that avagent.log contains communication details between the client agent and the Avamar utility node (MCS).

Avamar grids require hardware and operating system homogeneity. All nodes within a single multi-node server must be of the same hardware generation and run the same OS. Avamar Gen4 servers exclusively use SUSE Linux Enterprise Server (SLES). The presence of Gen3 nodes is an unsupported hardware mix. Furthermore, some nodes running Red Hat Enterprise Linux (RHEL) is an unsupported OS configuration for a Gen4 system. Therefore, the installation cannot proceed until the hardware and software are standardized to Gen4 nodes running SLES.

B. Re-kickstarting the RHEL nodes to SLES would not resolve the core issue of having an unsupported mix of Gen3 and Gen4 hardware in the same grid.

C. This is incorrect as Gen4 hardware requires SLES, not RHEL. This action would also fail to resolve the unsupported hardware generation mix.

D. This is incorrect because Avamar Gen4 servers are standardized on SLES, not RHEL. It also fails to address the mixed-generation hardware issue.

1. Dell EMC Avamar Administration Guide, P/N 302-005-475 REV 01, 2019, Page 39: "All data nodes in an Avamar multi-node server must be of the same Dell hardware generation."

2. Dell EMC Avamar Gen4S Hardware and Security Overview and Hardening Guide, 2016, Page 6: "The Avamar Gen4S hardware platform runs on SUSE Linux Enterprise Server 11 SP3 (SLES11SP3)." This establishes the OS standard for Gen4 hardware.

3. Dell Avamar 7.5.1 for VMware System Installation Guide, P/N 302-004-203 REV 01, 2018, Page 15: "All nodes in a multi-node server must be of the same type."

Dell Avamar best practices recommend a data mixture for optimal deduplication performance and capacity utilization. The ideal ratio is approximately 20% database data to 80% file system data. File system data typically contains high levels of redundancy and deduplicates very well. While Avamar can back up databases effectively, their data streams are often less redundant, especially if compressed or encrypted at the source. Adhering to this ratio helps ensure the system performs as expected and meets capacity projections. Exceeding this ratio significantly may require special sizing considerations.

A. 10:90 is an even more conservative ratio but not the standard best practice recommendation; the system can handle more database data than this.

C. 30:70 is sometimes considered an upper limit for database data but 20:80 is the more commonly cited best practice starting point.

D. 50:50 represents a very high proportion of database data that would likely lead to lower deduplication rates and require specific sizing adjustments.

1. Dell Avamar Operational Best Practices Guide, Page 11, Section "System Sizing and Data Profile". (Note: Specific document versions may vary, but this concept is consistently covered in sizing and best practice guides).

2. Dell Technologies Avamar Sizing Tool documentation often incorporates these ratios as default assumptions for mixed workloads.