EMC EMC Certification E20-385 Questions & Answers

• Question 1:

  An EMC Data Domain system has 300 TB of usable storage with 270 TB currently used. Daily backups are consuming an additional 5 TB per day.

  Based on this trend, what will occur if nothing is changed?

  A. Compression will keep increasing

  B. Disk performance will decrease

  C. File system will run cleaning more often

  D. File system will run out of space

  Correct Answer: D

• Question 2:

  On 8/15, what causes the drop in disk usage on the EMC Data Domain system as illustrated in the exhibit?

  

  A. Data was deleted on the system and file system cleaning completed

  B. Data was deleted on the system and no longer used

  C. Better deduplication ratios and less storage was needed

  D. More storage was added and allowed for higher compression

  Correct Answer: A

• Question 3:

  What is the default behavior for messages log files in an EMC Data Domain system?

  A. Every day at 06:00 a new log file is opened and the previous log file is renamed

  B. Every Sunday at 03:00 a new log file is opened and the previous log file is deleted

  C. Every Sunday at 03:00 a new log file is opened and the previous log file is renamed

  D. Every day at 06:00 a new log file is opened and the previous log file is deleted

  Correct Answer: C

• Question 4:

  Which pieces of information are necessary to determine the capacity requirements of an EMC Data Domain system?

  A. Full backup size, backup frequency, anticipated deduplication ratios, and retention policy

  B. Backup window duration, backup frequency, retention policy, and number of backup tapes created weekly

  C. Full backup size, recovery time objective, anticipated deduplication ratios, and retention policy

  D. Backup window duration, recovery time objective, anticipated deduplication ratios, and frequency of data restores

  Correct Answer: A

• Question 5:

  As represented in the exhibit,

  

  which metric is the Local-Comp Factor reporting in the filesys show compression output?

  A. Reduction in segment size resulting from the configured compression type lz, gz, or gzfast

  B. Reduction in segment size from EMC DD Boost plugin clients

  C. Reduction in segment size from low bandwidth optimized replication at the source

  D. Deduplication reduction factor for the local EMC Data Domain system

  Correct Answer: A

• Question 6:

  An organization has 6000 GB of file system data with a daily change rate of 10%. Assume the first backup reduces by a factor of 3 (3x), daily incremental backups reduce by a factor of 10 (10x), and subsequent full backups reduce by a factor of 30 (30x). Required retention is 10 weeks (1 weekly full/6 daily incrementals) and system utilization cannot exceed 50% of available capacity.

  What is the minimum EMC Data Domain storage required?

  A. 5600 GB

  B. 7600 GB

  C. 11200 GB

  D. 15200 GB

  Correct Answer: D

• Question 7:

  An organization has 3000 GB of file system data with a daily change rate of 10%. Assume the first backup reduces by a factor of 3 (3x), daily incremental backups reduce by a factor of 10 (10x), and subsequent full backups reduce by a factor of 30 (30x). Required retention is 10 weeks (1 weekly full/6 daily incrementals) and system utilization cannot exceed 50% of available capacity.

  What is the minimum EMC Data Domain storage required?

  A. 2800 GB

  B. 3800 GB

  C. 5600 GB

  D. 7600 GB

  Correct Answer: D

• Question 8:

  On an EMC Data Domain system, what is the purpose of the log host add command?

  A. Add a system to the list that receives alert messages

  B. Add a system to the list that receives system log messages

  C. Enable sending log messages using SNMP

  D. Enable the Data Domain system to receive log messages

  Correct Answer: B

• Question 9:

  What does the term "compression factor" refer to in the exhibit?

  

  A. Aggregate data reduction ratio

  B. Space used after compression

  C. Data sent to the EMC Data Domain system

  D. Total available space remaining

  Correct Answer: A

• Question 10:

  An EMC Data Domain customer has been achieving a compression ratio of 14:1 for database backups over the past year. Two weeks ago the aggregate compression dropped from 14:1 to 4:1. What is a possible cause for this change in compression?

  A. User changed from single-threaded backups to multiplexed backups

  B. User changed from five backups per week to seven backups per week

  C. User changed the time backups start

  D. User changed from a 1 GB NIC to a 10 GB NIC

  Correct Answer: A