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E20-880 - VNX Solutions Expert for Technology Architects - Real Exam Questions

Vendor Name EMC
Exam Code E20-880
Exam Name VNX Solutions Expert for Technology Architects
Questions and Answers 128 Q & A
Updated On September 14, 2017
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E20-880 Demo and Sample

Note: Answers are below each question.
Samples are taken from full version.


  1. Create ten consistency groups (one for each LUN) and ensure that the update frequency is the same for all groups

  2. Fracture all mirrors before adding them to the consistency group

Answer: D


A customer implemented full SAN Copy with default settings in order to copy 60 DMX array volumes to a VNX storage system. After several hours, they determine that the process is taking much longer than expected. Which storage system configuration change will improve performance?

  1. Disable the CMI channel on the destination storage system

  2. Disable write cache for the Reserved LUN Pool on the source storage system

  3. Add faster LUNs to the Reserved LUN Pool

  4. Increase the throttle value

Answer: B


A customer needs to move data from a CLARiiON to a new VNX storage system. Attempts to configure a SAN Copy session with Unisphere fail. The customer uses Navisphere Secure CLI to configure the session. The session can be successfully started from Navisphere Secure CLI but fails just prior to completion each time it is started. What is the cause of the failure?

  1. Source and target LUN IDs do not match.

  2. Source is a standard LUN and the target array has only meta LUNs available.

  3. Source LUN is larger than the target LUN.

  4. Source LUN is RAID 1/0 and the target LUN is RAID 5.

Answer: D


Refer to the exhibit.

A large IO spans multiple disks, and 2 stripes. How will the stripe crossing counter and the disk crossing counter increase?

  1. 1 stripe crossing and 1 disk crossing

  2. 1 stripe crossing and 5 disk crossings

  3. 2 stripe crossings and 1 disk crossing

  4. 2 stripe crossings and 5 disk crossings

Answer: A


Refer to the exhibit.

A single small IO spans 2 physical disks. What will the disk crossing counter increase by?

  1. 1

  2. 2

  3. 4

  4. 5

Answer: A


Refer to the exhibit.

A pre-MCx VNX has three SAS DAEs configured with eight 4+1 RAID 5 Groups and six Hot Spares as shown in the exhibit. All RGs are unused except for RG 0, which contains the Control LUNs. All LUNs except for those in RG 0 are the same size. Which dvols will be selected for file system creation using Automatic Volume Management System-defined pools?

  1. dvols 11, 13, 20, and 22

  2. dvols 9, 12, 14, and 18

  3. dvols 7, 11, 17, and 25

  4. dvols 9, 10, 11, and 12

Answer: A


Refer to the exhibit.

Which process is illustrated in the exhibit?

  1. FAST Cache warmup

  2. FAST VP slice relocation

  3. FAST VP policy change

  4. FAST Cache writeback

Answer: A


Refer to the exhibit.

A customer starts a test running on a thick LUN. The test generates random 4 kB I/Os with a R/W ratio of 2:1. A VNX Snapshot is started on the thick LUN at 09:37. The customer notes a decrease in LUN performance and asks for an explanation. Which explanation is correct?

  1. New writes are redirected to slices outside of the thick LUN area.

  2. The read/write ratio changes once a VNX Snapshot is started on a LUN.

  3. Write coalescing causes the physical disks to perform longer seeks.

  4. Prefetching causes the physical disks to perform fewer seeks.

Answer: A


Refer to the exhibit.

A VNX Snapshot is started on a Thick LUN at 09:37. The customer wishes to know why throughput drops immediately after the VNX Snapshot starts. What is your explanation?

  1. The VNX is configuring the tracking structure for the VNX Snapshot.

  2. Reserved LUNs are being allocated to the thick LUN.

  3. The thick LUN is being converted to a thin LUN.

  4. VNX Snapshot blocks on the thick LUN are being compressed.

Answer: A


Refer to the Exhibit.

An administrator is checking the load on the array. The administrator is trying to determine if this is an acceptable range (between 8370 and 8990 IOPs). Based on the illustration, what can you conclude?

  1. The array is being saturated

  2. The array is at moderate operation

  3. The array’s load is light, with low response.

  4. The array is in acceptable range

Answer: A


Refer to the Exhibit.

VNX SAN Administrator is checking the load on the array. The administrator is trying to determine if this is an acceptable range (between 7130 and 7740). Based on the illustration, what can you conclude?

  1. The array is being over utilized

  2. The array is at moderate operation

  3. The array’s load is light, with low response

  4. The array is in an acceptable range

Answer: A


Refer to the exhibit.

A VNX administrator is analyzing storage workload distribution. The administrator wants to know if the array has an acceptable skew. Based on the workload in the illustration, what could be concluded?

  1. 90% of the workload is distributed over 10% of the capacity, for a skew of 90%.

  2. 10% of the workload is distributed over 90% of the capacity, for a skew of 80%.

  3. 90% of the workload is distributed over 10% of the capacity, for a skew of 10%.

  4. 90% of the workload is distributed over 50% of the capacity, for a skew of 10%.

Answer: A


A VNX Administrator is analyzing storage workload distribution. The administrator is trying to determine if the array has an acceptable skew. Based on the workload in the illustration, what could be concluded?

  1. 95% of the workload is distributed over 5% of the capacity, for a skew of 95%.

  2. 10% of the workload is distributed over 90% of the capacity, for a skew of 80%.

  3. 80% of the workload is distributed over 20% of the capacity, for a skew of 20%.

  4. 90% of the workload is distributed over 50% of the capacity, for a skew of 10%.

Answer: A

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