EMC EMC Certifications DES-1D12 Questions & Answers

• Question 51:

  What is a consequence of using an 800 GB drive and five 400 GB drives in a Dell EMC Unity XT dynamic pool?

  A. Extents 9 -14 are used to create a RAID Group

  B. Unisphere short strokes the 800 GB drive to 8 extents

  C. Extents 9 -14 are marked unavailable until more 800 GB drives are added

  D. Extents 9 -14 are marked unavailable and can never be recovered

  Correct Answer: C

  The entire capacity of a particular drive size is only available when the drive count within the drive partnership group for the drive in question matches or exceeds the stripe width plus one drive. It is not recommended to mix different size drives of the same type for this reason, unless an adequate number of drives are available to meet or exceed the stripe width plus one drive requirement h16289-dell_emc_unity-dynamic_pools.pdf-Page 18-19

• Question 52:

  You are designing a Dell EMC Unity solution. You need to predict its expected performance based on workload, number o and type of drives, and RAID protection. Which design path on the Midrange Sizer should you take?

  A. System Designer path

  B. Application Oriented path

  C. Quick Configuration path

  D. Performance Data Input path

  Correct Answer: C

• Question 53:

  What is the Dell EMC best practice for sizing and designing a Dell EMC SC Series solution?

  A. Front-end ports required for performance should always meet capacity needs

  B. Drive capacity should meet performance needs

  C. Size for performance first and capacity second

  D. Size for capacity; Data Progression should always meet performance needs

  Correct Answer: C

• Question 54:

  A customer with a Dell Unity 550F has recently upgraded to the Unity OE 5 0 release They want to use the Advanced Deduplication feature to reduce the used data capacity in a dynamic storage pool LUNs in the pool have the feature enabled but the pool used capacity has not reduced

  What is one way to fix this problem?

  A. Sequentially reboot both Storage Processors

  B. Free up at least 50% capacity to the pool

  C. Trespass the LUNs to the peer Storage Processor

  D. Move the LUNs to a different pool

  Correct Answer: D

• Question 55:

  What is a benefit of cross-platform replication between Dell EMC SC Series and Dell PS Series arrays?

  A. Leverages existing interfaces

  B. Enables replication of volume collections

  C. Supports cascade mode for the PS Group

  D. Provides active snapshot replication

  Correct Answer: A

• Question 56:

  A customer sales order lists .2 Devices as a line item. The order is for a Dell EMC Unity 380F array. How many .2 Devices should appear in the order?

  A. 2

  B. 4

  C. 6

  D. 8

  Correct Answer: A

• Question 57:

  Which encryption algorithm is used for SMB shares on Dell EMC Unity?

  A. AES-CCM

  B. AES128-GCM

  C. AES-CMAC

  D. HMAC-SHA256

  Correct Answer: B

  This provides improved security and encryption traffic performance for SMB3 by changing the encryption algorithm from AES-CCM-128 to AESGCM-128. Page 40 :https://www.delltechnologies.com/en-zm/collaterals/unauth/white-papers/products/storage/h15572-dell-emc-unity-nas-capabilities.pdf

• Question 58:

  What initiates an automatic NAS server failover to the peer SP?

  A. Network link failure

  B. Resource balancing algorithm

  C. Assisted internal migration

  D. SP hardware fault

  Correct Answer: D

  An SP hardware fault initiates an automatic NAS server failover to the peer SP in Dell Unity systems. This ensures that the NAS services remain available in case of hardware failure in one of the Storage Processors (SPs). The failover process is automatic and transparent to the hosts accessing the data, and it helps to maintain the high availability of the NAS services.

• Question 59:

  You are upgrading a Dell EMC Unity array to a Dell EMC PowerStore 1000 T array. The customer asks what they need to do so they can map PowerStore snapshots from the new PowerStore array to a host. What should be your response?

  A. Create a volume group of the snapshot.

  B. Create a read/write snapshot of the snapshot

  C. Create a copy of the snapshot

  D. Create a thin clone of the snapshot

  Correct Answer: D

  "Volume and Volume Group Snapshots: Snapshots cannot be mapped to a host. To view the contents of a snapshot, you must first clone the snapshot then map the clone to a host."

• Question 60:

  Which Unity load balancing method will optimize performance in a customer environment if there are a limited number of open FC switch ports?

  A. A Least I/O

  B. Priority

  C. Round Robin

  D. Port to Core Affinity

  Correct Answer: D

  The best Unity load balancing method to optimize performance in a customer environment with a limited number of open FC switch ports is Port to Core Affinity. This method will assign the same port to the same core when possible. This allows the same switching resources to be used in the same cores, which will optimize performance due to reduced latency. Priority and Round Robin methods will also provide load balancing, but they are not as effective in a limited port environment. Least I/O is not recommended in this situation, as it will not provide adequate load balancing.