EMC EMC Certifications DES-1D12 Questions & Answers

• Question 11:

  A Dell EMC Unity storage administrator has 10 hosts. One of the hosts experiences occasional, huge IO bursts. What is a best practice for avoiding performance issues during these burst periods?

  A. Enabling Quality of Service (QoS) will limit the burst problem

  B. Quality of Service (QoS) is enabled by default, so one only needs to configure burst settings

  C. Enable Quality of Service (QoS) then limit I/O for the entire FC port

  D. Enable Quality of Service (QoS) then configure burst settings

  Correct Answer: B

• Question 12:

  A Dell EMC Unity storage administrator needs to build a NAS server configuration to support failover between SPs and NAS resources. What is a term for this configuration?

  A. Local Replication

  B. IP Multi-tenancy

  C. LACP

  D. Separate IP Switches

  Correct Answer: C

  Reference: https://www.delltechnologies.com/en-ae/documentation/unity-family/unity-p-replication-config/02-unity-rep-br-workflow.htm

• Question 13:

  You plan to schedule a Live Optics sampling with your customer to size a Dell EMC SC Series array. However, the customer wants to postpone the run until the end of the quarter because there could be more activity on the current storage system.

  What course of action is recommended?

  A. Wait until the end of the quarter and collect a week-long sampling

  B. Take a single-day sampling on any given day because that is sufficient in most instances

  C. Wait until the end of the quarter and collect a single-day sampling

  D. Take a week-long sampling on any given week because that is sufficient in most instances

  Correct Answer: B

• Question 14:

  What is the function of CMI on a Dell EMC Unity array?

  A. Used for inter-SP communications

  B. Acts as an extension of M.2 memory

  C. Enables Vaulting to Disk

  D. Handles API calls for HTTP client

  Correct Answer: A

  Common Messaging Interface (CMI): A high speed bus that is used for communication between SPs, such as mirroring write cache or redirecting I/Os from a non-optimized path. Reference:https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h15162-dell_emc_unity-high_availability.pdf

• Question 15:

  What occurs immediately before the write is acknowledged to the host in a Dell PowerStore 1000T?

  A. The peer node is updated

  B. Data is passed through the deduplication and compression logic

  C. I/O is saved within the node DRAM memory

  D. Information is stored on the nonvolatile media of the NVRAM drives

  Correct Answer: C

  Before the write is acknowledged to the host in a Dell PowerStore 1000T, I/O is saved within the node DRAM memory. This is done to ensure that the write operation is successful and so that the data is safely stored in the event of a power failure. The data is then passed through the deduplication and compression logic, and finally stored on the nonvolatile media of the NVRAM drives.

• Question 16:

  When sizing a Dell EMC Unity Hybrid array, what are considerations for growth?

  A. Port utilization and load balancing

  B. Cache utilization and hardware bottlenecks

  C. Latency and queue depth

  D. General capacity and active data

  Correct Answer: A

• Question 17:

  Which Dell EMC Midrange storage platforms support NVMe SCM drives?

  A. PowerStore T and SC Series only

  B. PowerStore T and PowerStore X

  C. PowerStore T, Unity XT, and SC Series

  D. PowerStore X, Unity XT, and SC Series

  Correct Answer: B

• Question 18:

  Which block resources are supported with Dell EMC Unity asynchronous replication?

  A. Consistency Groups and file systems

  B. VMFS and NFS datastores

  C. LUNs and file systems

  D. LUNs and VMFS datastores

  Correct Answer: D

  Reference:https://cdn2.hubspot.net/hubfs/1885982/dell-emc-unity-unisphere-overview.pdf?t=1543339206682

• Question 19:

  Which Dell EMC SC Series array allows for back-end expansion cards?

  A. SCv3000

  B. SC7020

  C. SC5020

  D. SCv3020

  Correct Answer: B

  https://www.dell.com/support/manuals/en-us/storage-sc7020/sc7020-om/sc7020-series-storage-system-back-panel-view?guid=guid-ba3314b9-ddaf-4413-8a25-4bb66c2d421bandlang=en-us

  Here we clearly have Each storage controller contains:[...] Expansion slots for I/O cards:

  Slots for optional front-end connectivity ?Fibre Channel and iSCSI I/O cards Slots for optional back-end connectivity ?SAS I/O cards [...] SCv3000, SCv3000 and SC5020 owner manual say: One expansion slot for a front-end I/O card:

  https://www.delltechnologies.com/de-at/collaterals/unauth/technical-guides-support-information/services/h17356-storage-config-sap-hana-tdi-sc-vg.pdf

• Question 20:

  A Dell Unity XT hybrid flash array system is configured with FAST Cache to optimize data access for OLTP workloads. What level of data granularity is tracked and promoted to the secondary cache?

  A. 8KB

  B. 256KB

  C. 64 KB

  D. 128 KB

  Correct Answer: A

  FAST Cache is an intelligent caching technology that optimizes data access for OLTP workloads by tracking and promoting data at the granularity of 8KB blocks. It uses a combination of flash memory and DRAM to store frequently accessed data, allowing the system to quickly access the most frequently used data, reducing latency and improving overall performance.