DES-1D12 Online Practice Questions and Answers

Correct Answer: D

The DPE on 480/F, 680/F, and 880/F systems is internally connected to Bus 99 which is a separate bus than the first SAS expansion port that is connected to Bus 0. Therefore, the DPE is recognized by the system as Bus 99 Enclosure 0 while the first DAE connected to the first SAS expansion port would be Bus 0 Enclosure 0. This is different than X00/F, X50F, and 380/F systems. Furthermore, this means that the twenty-five drives in front of the DPE for 480/F, 680/F, and 880/F systems are internally recognized as Bus 99 Enclosure 0 Drive 0 -Bus 99 Enclosure 0 Drive 24. In Unisphere, the drives are seen DPE Drive 0 -DPE Drive 24

Correct Answer: B

A Dell PowerStore protection policy contains two snapshot rules and one replication rule, and it applies to specific storage resources such as volumes and volume groups. These resources will run only the snapshot rules, not the replication rule. A snapshot rule allows you to create point-in-time copies of the data, which can be used to recover data in case of data loss or corruption. Snapshot rules are applied to specific volumes or volume groups, and only these resources will be backed up with the snapshot. A replication rule allows you to replicate data to a remote site for disaster recovery or data protection. Replication rules are applied to different resources such as Virtual Machines, File Servers, File Systems, etc. In this case, the snapshot rules will be applied to Volumes and Volume Groups, and the replication rule will be applied to other resources such as Virtual Machines, File Servers, File Systems.

Correct Answer: C

Reference; https://www.delltechnologies.com/en-ba/collaterals/unauth/white-papers/products/storage/h15089-dell_emc_unity-snapshots_and_thin_clones.pdf (7)

Correct Answer: A

NOTE General DAE back-end bus configuration rules:

Maximum number of enclosures per bus is 10.

Maximum number of drive slots per bus is 250, up to specific system limitations for drive slots.

Correct Answer: C

Asynchronous replication can be used to replicate data over larger distances than synchronous replication. However, it cannot be used to replicate data between two UnityVSA systems within the same city. To replicate file data from a production Dell Unity 550F to a remote office in the same city with a UnityVSA, the technical architect should advise the customer to use synchronous replication.

Correct Answer: D

QoS – Rate limiting

Protect against “Noisy Neighbor”

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512 Limits

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More granular control

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Limit by IOPS, BW, or both

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Apply to:

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Individual LUNs

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Group of LUNs

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VMFS Datastores

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Attached Snapshots

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Can assign total limit to be shared among LUNs in Group

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Can move LUN(s) to other QoS Policy

Correct Answer: A

Reference: https://www.delltechnologies.com/en-us/collaterals/unauth/white-papers/products/storage/h15093-dell-emc-unity-best-practices-guide.pdf

Correct Answer: B

Reference:https://docplayer.net/77745477-Dell-emc-unity-snapshots-and-thin-clones.html

Correct Answer: C

Reference: https://downloads.dell.com/manuals/all-products/esuprt_solutions_int/ esuprt_solutions_int_solutions_resources/s-solution-resources_white-papers108_en-us.pdf (9)

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.