Free D-UN-DY-23 sample questions

Correct answers: Replication interfaces must be configured on each SP of both systems, and a replication connection must exist between the systems.; The RPO can be set to any value between 5 minutes and 24 hours.

Remote asynchronous replication needs replication interfaces on each SP of the source and destination systems. A replication connection between the two systems is then created over those interfaces.

Unity asynchronous replication accepts an RPO from 5 minutes to 1,440 minutes (24 hours), with a default of 60 minutes. The required 1-hour RPO falls inside that range, so asynchronous replication can meet it.

Correct answer: False

False. UnityVSA is a software-defined storage appliance that 'is deployed on a VMware ESXi host'; a 64-bit ESXi host (ESXi 6.5 or later) is required, and Unity Cloud Edition runs on VMware Cloud on AWS (UnityVSA Installation Guide, 'Overview of UnityVSA' and 'ESXi host requirements'). No Dell document lists Microsoft Hyper-V as a supported hypervisor, so a Windows Server Hyper-V host cannot run UnityVSA.

Correct answer: DNS servers for the NAS server

The Configuring SMB File Sharing guide says that on the DNS page of the NAS server wizard, configuring DNS 'is mandatory when joining to an AD domain, but optional for a standalone NAS server'. The domain join also needs NTP configured on the storage system and a domain account with rights to join the domain. A UNIX Directory Service (LDAP or NIS) is needed for NFS or multiprotocol identity mapping, not for an SMB-only server. Access-Based Enumeration is an SMB share option, not a NAS server setting. Replication settings on the Replication page are optional.

Correct answer: REST API

The Unity REST API can perform every management task that the Unisphere GUI can, uses standard HTTP operations such as GET, POST and DELETE, and formats all communication in JSON, so the pipeline's orchestration tool can call it directly to create LUNs, grant host access and delete them (Unisphere Overview white paper, REST API, p39). UEMCLI can also script these tasks, but it is a client program that must first be installed on a Windows or UNIX/Linux computer (Unisphere CLI User Guide, Install Unisphere CLI, p18), which the build agents do not allow. The Unisphere HTML5 GUI is for interactive use, and CloudIQ is a cloud monitoring and analytics service, not a provisioning interface.

Correct answer: Round Robin (RR)

Dell's best practice for connecting ESXi hosts to Unity arrays via both iSCSI and Fibre Channel is to use the Round Robin (RR) Path Selection Policy. This policy actively distributes I/O requests across all available active paths in rotation, providing superior load balancing and performance compared to MRU (which only uses one path until it fails) or Fixed (which uses a single preferred path).

Correct answer: Start High, then Auto-Tier

The "Start High, then Auto-Tier" policy is specifically designed for this type of workload. It forces all initial writes to the highest available tier (Extreme Performance/Flash), ensuring maximum ingest performance. Afterward, the standard FAST VP algorithm analyzes data access patterns and automatically relocates colder data slices to lower tiers (Performance and Capacity) over time based on activity. This provides the benefits of both initial high performance and long-term storage efficiency.

Correct answer: 10 ms

With synchronous replication each write is saved locally and on the remote system before the host receives the acknowledgement, so link latency is added to every write. Dell EMC Unity: Replication Technologies states that synchronous replication has a distance limitation that is 'generally 60 miles or 100 km between sites' and that 'it is recommended to ensure the latency of the link between the local and remote system is less than 10ms'. 2 ms and 5 ms are not the documented limit, and 20 ms is above the recommendation; for longer distances or higher latency use asynchronous replication.

Correct answer: 1

A key advantage of dynamic pools is the flexibility of expansion. Unlike traditional RAID groups that require adding drives in specific multiples, dynamic pools can be expanded by adding just a single drive at a time, as long as the drive is of a compatible type and size for an existing tier. The system will automatically rebalance the data across the new set of drives.

Correct answer: It acts as the boot device and stores the Operating Environment (OE) image.

On the Unity XT 480/F, 680/F and 880/F, each Storage Processor has two M.2 SSDs. The M.2 SATA SSD 'holds the boot image that is used to boot the operating environment', and the M.2 NVMe SSD is the backup (vault) device to which SP cache memory is written if the SP fails or loses power (Dell Unity XT: Introduction to the Platform). On the 380/F a single M.2 SSD per SP does both jobs. The M.2 devices do not hold user data, are not FAST Cache (which uses SAS Flash drives), and do not serve as the write cache for incoming I/O, which is SP memory.

Correct answers: While the file system contains locked files, FLR-C prevents even an administrator from deleting the file system.; FLR-C must be selected when the file system is created; an existing file system cannot be switched to FLR-C later.

FLR-C is the strict compliance mode built for WORM regulations. Unlike FLR-E, it stops even an administrator from deleting a file system that still holds locked files. Every locked file must expire first.

The FLR mode (disabled, enterprise or compliance) is chosen when the file system is created. Later changes only adjust retention, auto-lock and auto-delete, so an existing file system cannot become FLR-C.