D-AV-DY-23 Dell Avamar Deploy Practice Questions
Prepare for D-AV-DY-23 with more than an answer.
- Level
- Deploy
- Valid for
- Does not expire (as of October 21, 2022)
Domains covered on the exam 4
- Avamar Concepts18%
- Avamar Implementation13%
- Avamar Installation and Maintenance24%
- Avamar Administration45%
- 1
What is the primary difference between Avamar's variable-length deduplication and fixed-length deduplication used by some other backup products?
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Correct answer: D
The key advantage of variable-length deduplication is its resilience to data shifting. When data is inserted into the middle of a file, fixed-length chunking causes all subsequent chunks to change, ruining the deduplication potential. Avamar's variable-length algorithm uses data content to define chunk boundaries, so when data is inserted, only the chunks immediately around the insertion point change, while the rest of the file's chunks remain identical and are deduplicated effectively.
- 2
A new Avamar administrator logs into the AUI and needs to create a new dataset for backing up Oracle databases. In which section of the AUI would they navigate to create and configure this dataset?
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Correct answer: C
In the Avamar Web User Interface (AUI), datasets, which define what to back up, are managed under the 'Asset Management' section. The administrator would navigate to Asset Management and then select the 'Datasets' tab to create, edit, or delete datasets for various plug-ins like Oracle.
- 3
During the replacement of a failed data node in an ADS Gen4T grid, the system enters a read-only state. Which activities are permitted during this time? (Select ALL that apply)
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Correct answer: A, B
Restore operations are read-only activities from the perspective of the Avamar grid's stored data. Because the RAIN architecture ensures data is still accessible via parity, restores are permitted while the grid is in a read-only state.
Browsing backup contents is a read operation that queries the backup catalog. This functionality remains available while the system is in a read-only state, allowing administrators to prepare for restores.
- 4
A small startup is deploying its first backup solution. They have a virtualized environment with about 10 TB of source data, limited physical data center space, and a tight budget. They need a fully featured Avamar solution. Which deployment model is most appropriate?
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Correct answer: A
Avamar Virtual Edition (AVE) is the ideal solution for this scenario. It provides the full functionality of Avamar software but is deployed as a virtual appliance on the customer's existing hypervisor (e.g., VMware). This eliminates the need for dedicated physical hardware, saving space and cost. AVE is available in various sizes, including smaller capacities suitable for a 10 TB environment.
- 5
An architect is explaining the data flow during an Avamar backup from a client to a multi-node grid integrated with a Data Domain system. Which diagram accurately represents this flow?
graph TD subgraph Client A[File System Data] B(Avamar Client) C{Dedupe Cache} end subgraph Network D["Unique Data Chunks"] end subgraph Avamar Grid E[Utility Node] F[Storage Nodes] end subgraph Data Domain G[(DD Storage)] end A --> B B C B --> D D --> E E --> F F --> GShow answer details
Correct answer: A
The correct data flow is as follows:
- The Avamar client performs source-side deduplication, sending only unique data chunks over the network.
- The unique data arrives at the Avamar Utility Node, which manages the backup session.
- The Utility Node then directs the data to be written directly to the integrated Data Domain system.
In this configuration, the Avamar Storage Nodes are not used for storing the backup data itself; they primarily store metadata, while the deduplicated data resides on the Data Domain.
sequenceDiagram participant Client participant AvamarUtility as Avamar Utility Node participant DD as Data Domain Client->>AvamarUtility: Initiate Backup (send hashes) AvamarUtility-->>Client: Request Unique Chunks Client->>AvamarUtility: Send Unique Data Chunks AvamarUtility->>DD: Write Data Chunks DD-->>AvamarUtility: Acknowledge Write AvamarUtility-->>Client: Backup Complete - 6
A financial services company is deploying a new multi-node Avamar Data Store Gen4T. During the network planning phase, the administrator is configuring DNS. Which record type is mandatory for the utility node to ensure proper internal and external communication for management and replication tasks?
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Correct answer: A
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.
- 7
An administrator is reviewing the daily maintenance activities on an Avamar server. They notice that the garbage collection process is taking significantly longer than usual, impacting the backup window. What is the MOST likely cause for the extended garbage collection duration?
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Correct answer: C
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.
- 8
A consultant is designing an Avamar solution for a company with a central data center and 50 remote offices with slow, high-latency WAN links. The primary requirement is to minimize backup traffic over the WAN. Which Avamar feature is most critical to meeting this requirement?
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Correct answer: C
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.
- 9
A new Avamar Virtual Edition (AVE) v19.4 instance is being deployed on VMware vSphere. The implementation engineer needs to ensure optimal performance and stability. Which two of the following are mandatory prerequisites for the virtual machine's storage? (Select TWO)
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Correct answer: A, B
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.
- 10
True or False: After adding a new data node to an existing Avamar Data Store Gen4T grid, a full data rebalancing process must be manually initiated by the administrator to distribute existing data to the new node.
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Correct answer: A
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.
