EMC EMC Certifications DES-1D12 Questions & Answers

• Question 41:

  What is one key difference between deduplication on Dell PowerStore and Dell Unity?

  A. Unity has no deduplication function

  B. Unity data reduction cannot be disabled

  C. Deduplication block size is smaller on PowerStore than on Unity

  D. Deduplication block size is larger on PowerStore than on Unity

  Correct Answer: C

  Deduplication is a feature that reduces storage capacity usage by eliminating duplicate data. PowerStore and Unity both have deduplication function, but one key difference is the size of the deduplication block. PowerStore uses a smaller block size which allows for a higher level of granularity and more efficient deduplication. On the other hand, Unity uses a larger block size which is less granular, but it is still efficient for large sequential data workloads.

• Question 42:

  You are designing a two-tiered Dell EMC SC Series solution that will be optimized for performance. You gather the necessary data from Live Optics and find that the read/write ratio is 80:20. What approach is recommended?

  A. Size Tier 1 for 100% of the adjusted IOPS

  B. Use distributed adjusted IOPS for all tiers

  C. Use distributed adjusted IOPS for Tiers 1 and 2 only

  D. Size Tier 2 for 100% of the adjusted IOPS

  Correct Answer: A

  "The engineer should design a system to handle all, or nearly all, IOPS in one particular tier"

• Question 43:

  What is a characteristic of tenant traffic on a Dell EMC Unity array?

  A. Separated by the associated VLANs at the Linux Kernel layer

  B. Separated by the associated subnet providing data separation with increasing security at the network layer

  C. Separated by one associated VLAN providing data separation with increasing security at the Linux Kernel layer

  D. Separated by the associated subnet at the Linux Kernel layer

  Correct Answer: A

• Question 44:

  A Dell EMC PowerStore customer wants to schedule snapshots daily at 6 AM. Which snapshot frequency interval (in minutes) is available?

  A. 5

  B. 10

  C. 20

  D. 45

  Correct Answer: A

  Reference: https://www.delltechnologies.com/en-us/collaterals/unauth/white-papers/products/storage/h18156-dell-emc-powerstore-snapshots-thin-clones.pdf (27)

• Question 45:

  When designing a Dell EMC SC Series system, which factors regarding general performance are important to understand?

  A. Write size and latency

  B. Block size and read size

  C. Latency and queue depth

  D. Transport and queue depth

  Correct Answer: C

  "Whether gathering information or designing a system, it is important to understand two commonly used terms: Latency and queue depth"

• Question 46:

  Which features were introduced in SCOS 7.3?

  A. Distributed Sparing and Live Volume ALUA

  B. Data-in-Place upgrade for SC4020 and 4K HDD support

  C. Unisphere for SC and Live Volume Auto-failover

  D. CloudlQ support and Cross Platform Replication

  Correct Answer: A

  https://dl.dell.com/topicspdf/sc-7-3_rn_en-us.pdf

  Reference: https://www.delltechnologies.com/en-us/blog/storage-center-os-7-3-brings-big-performance-boost-to-sc-series-arrays/

• Question 47:

  A customer has a Dell EMC SC9000 array with six SC420 enclosures running SCOS 7.3. The enclosure configuration is as follows:

  1.

  Two enclosures have write-intensive SSDs

  2.

  Four enclosures have read-intensive SSDs

  What is recommended as a general guideline for making spare drive assignments?

  A. 2 spare drives per shell

  B. Dedicated spares are not required

  C. 2 spares per drive type per array

  D. 1 spare per drive type per shell

  Correct Answer: B

  "SCOS 7.3, Distributed Sparing: eliminates the need for dedicated spares by giving customers the option to distribute sparing capacity across all drives in the array."

• Question 48:

  What is the purpose of the NVMe NVRAM drives in a Dell EMC PowerStore 1000 array?

  A. Read cache and vaulting

  B. Read cache and base OS

  C. Write cache and base OS

  D. Write cache and vaulting

  Correct Answer: D

  The base enclosure is an all-NVMe platform, capable of supporting NVMe SSD, NVMe SCM, and NVMe NVRAM drives. You can populate slots 0 through 20 with NVMe SSD or NVMe SCM drives. Slots 21 through 24 are reserved for NVMe NVRAM drives which serve as additional system write caching. PowerStore 1000 and PowerStore 3000 models contain two NVMe NVRAM drives in slots 23 and 24. Reference:https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h18149-dell-emc-powerstore-platform-introduction.pdf

• Question 49:

  When enabling a multi-protocol NAS implementation on a Dell EMC PowerStore array, what is required for an end-to-end mapping of a Windows system?

  A. Group ID (GID)

  B. User ID (UID)

  C. Active Directory (AD)

  D. Security ID (SID)

  Correct Answer: D

  https://www.delltechnologies.com/en-us/collaterals/unauth/white-papers/products/storage/h18155-dell-emc-powerstore-file-capabilities.pdf page 22, multiprotocol, windows section, identifiers

• Question 50:

  What final operation should be performed after adding a single drive to a Dell Powerstore array?

  A. Add it to an existing DRS

  B. Format the drive

  C. Back up the Keystore

  D. Verify drive operation

  Correct Answer: D

  This ensures that the drive is properly connected and communicating with the array, and that it is functioning as expected. Additionally, the new drive should be added to an existing DRS(Drive Replacement Set) and if necessary, the keystore should be backed up and the drive should be formatted.