EMC E20-885 Online Practice Questions and Exam Preparation

EMC E20-885 Online Questions & Answers

• Question 1:

  A customer runs a CAD/CAM application on an VNX file system. The application is accessed by users at multiple sites. The users report degraded response during peak access periods. Performance monitoring of the file system shows a higher than expected disk queue length and a higher than expected number of unused blocks pre-fetched.

  What is the likely cause of the performance issue?

  A. Multi-threaded sequential reads causing random access patterns
  B. Single-threaded sequential reads flooding cache
  C. Multi-threaded random reads degrading per-thread performance
  D. Single-threaded random reads over-utilize pre-fetching
  A. Multi-threaded sequential reads causing random access patterns

• Question 2:

  A customer creates a Remote Mirror of a 1 GB RAID 5 pool LUN. The primary LUN is presented to a Windows storage group. The customer wants to add a Secondary Image to the Remote Mirror. The only LUNs available are 5 GB RAID 1/0 LUNs presented to a Linux storage group. The customer reports they are unable to add the Secondary Image. What do you advise?

  A. Secondary Image must be the same RAID type.
  B. Secondary Image must be the same capacity.
  C. Secondary Image must be in the same storage pool as the Primary Image.
  D. Secondary Image must be presented to the same host type.
  B. Secondary Image must be the same capacity.

• Question 3:

  A customer wants to expand FAST Cache on their VNX with MCx. They are concerned about performance impact until the new FAST Cache has been created. What advice would you give the customer regarding the performance impact of changing the FAST Cache size?

  A. Destroying the existing FAST Cache should be done during a period with low I/O activity, followed by the creation of the larger sized FAST Cache.
  B. FAST Cache can be expanded non-disruptively without any performance impact.
  C. Before adding extra drives to the existing FAST Cache, the Read Cache should be disabled and then re-enabled after the expansion has finished.
  D. Before adding extra drives to the existing FAST Cache, the Write Cache should be disabled and then re-enabled after the expansion has finished.
  A. Destroying the existing FAST Cache should be done during a period with low I/O activity, followed by the creation of the larger sized FAST Cache.

• Question 4:

  During a host write to an EMC VNX with write cache enabled, at what point does the host receive acknowledgement from the VNX that the write is complete?

  A. When the primary storage processor has cached the data
  B. When both storage processors have cached the data
  C. After data has been successfully committed to disk
  D. After data has been received by a storage processor
  B. When both storage processors have cached the data

• Question 5:

  Click on the calculator icon in the upper left-hand corner.

  A client has a storage requirement for an object database. The application is expected to generate random I/O requests. The I/O profile is:

  -70% random reads

  -30% random writes

  -Total host I/O per second is 20,000

  -

  Required usable capacity is 35 TB

  The client is concerned about cost, so RAID 5 (8+1) data protection will be used. What is the minimum number of 300 GB 15K SAS drives needed to meet the client's performance and storage requirements, including hot spares drives?

  A. 223
  B. 166
  C. 292
  D. 238
  A. 223

• Question 6:

  A client is planning a virtualized SQL Server environment with remote protection. They need virtual machine consistent, point-in-time copies of the database as backups. Which option meets this scenario?

  A. Raw Device Map and MirrorView
  B. Raw Device Map and VMHA
  C. VMFS vDisk and MirrorView
  D. VMFS vDisk and VMHA
  D. VMFS vDisk and VMHA

• Question 7:

  A client is planning a virtualized SQL environment with remote protection. They want SQL- aware recoverable replicas. Which solution would you recommend?

  A. Raw device mapping and VMHA
  B. VMFS vDisk and MirrorView
  C. VMFS vDisk and VMHA
  D. Raw device mapping and MirrorView
  D. Raw device mapping and MirrorView

• Question 8:

  A customer is suffering from hot spots in their single tier pool. Based on research done with Unisphere Analyzer they notice high activity on some drives and modest-to-low activity on other drives.

  They decide to expand the pool and let the data relocate itself over all drives available. Immediately after pool expansion finishes they notice they still have hot spots.

  Why was the pool data not redistributed equally using performance data?

  A. Without FAST-VP, data is only relocated based on capacity, not performance.
  B. The relocation should be started manually so the redistribution will take place.
  C. Data relocation did not take place because FAST-VP only relocates data across different tiers.
  D. No data was actually relocated because the LUNs in the tier were set to "No Data Movement".
  A. Without FAST-VP, data is only relocated based on capacity, not performance.

• Question 9:

  A customer used the EMC VNX AVM feature to create a number of file systems. New LUNs were recently presented to AVM as VNX disk volumes. After the first file system is created, the customer receives an error message saying that there is no more space in the Storage Pool for File.

  Which Storage Pool attribute could have caused this result?

  A. is_dynamic
  B. is_greedy
  C. default_slice_flag
  D. default_stack_size
  A. is_dynamic

• Question 10:

  A Storage Administrator with a VNX Unified solution is using the CLI to monitor a highly specific view of daily storage performance. They must type long commands to examine the desired statistical information. You have been asked to accelerate this task.

  What is the most suitable solution?

  A. Create user-defined statGroups
  B. Use Unisphere Statistics for File
  C. Use Celerra Monitor Tool
  D. Collect statistics from log files
  A. Create user-defined statGroups