EMC Technology Architect E20-880 Questions & Answers

• Question 1:

  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?

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

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

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

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

  Correct Answer: A

• Question 2:

  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?

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

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

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

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

  Correct Answer: A

• Question 3:

  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?

  A. The array is being over utilized

  B. The array is at moderate operation

  C. The array's load is light, with low response

  D. The array is in an acceptable range

  Correct Answer: A

• Question 4:

  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?

  A. The array is being saturated

  B. The array is at moderate operation

  C. The array's load is light, with low response.

  D. The array is in acceptable range

  Correct Answer: A

• Question 5:

  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?

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

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

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

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

  Correct Answer: A

• Question 6:

  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?

  A.

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

  B.

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

  C.

  Write coalescing causes the physical disks to perform longer seeks.

  D.

  Prefetching causes the physical disks to perform fewer seeks.

  Correct Answer: A

• Question 7:

  Refer to the exhibit.

  

  Which process is illustrated in the exhibit?

  A. FAST Cache warmup

  B. FAST VP slice relocation

  C. FAST VP policy change

  D. FAST Cache writeback

  Correct Answer: A

• Question 8:

  Refer to the exhibit.

  

  A single small IO spans 2 physical disks.

  What will the disk crossing counter increase by?

  A. 1

  B. 2

  C. 4

  D. 5

  Correct Answer: A

• Question 9:

  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?

  A. dvols 11, 13, 20, and 22

  B. dvols 9, 12, 14, and 18

  C. dvols 7, 11, 17, and 25

  D. dvols 9, 10, 11, and 12

  Correct Answer: A

• Question 10:

  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?

  A. 1 stripe crossing and 1 disk crossing

  B. 1 stripe crossing and 5 disk crossings

  C. 2 stripe crossings and 1 disk crossing

  D. 2 stripe crossings and 5 disk crossings

  Correct Answer: A