EMC E20-598 Online Practice Questions and Exam Preparation

EMC E20-598 Online Questions & Answers

• Question 141:

  The EMC Avamar client needs to backup a file and has performed sticky-byte factoring. This results in the following:

  Seven (7) chunks that will compress at 30%

  Four (4) that will compress at 23%

  Two (2) chunks at 50% compression

  How many chunks will be compressed prior to hashing?

  A. 4
  B. 7
  C. 9
  D. 13
  C. 9

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  vamar, has a rather nifty technology called Sticky Byte Factoring which allows it to identify the changed information inside a file by breaking the file into variable length objects, this leads to much greater efficiency than fixed size approaches as changes made early in a fixed length sequence affect all subsequent blocks/chunks/objects/whatever in that sequence. This in turn changes all the fingerprints taken following the changed data which means you end up with a lot of new blocks/chunks/objects/whatever even if the data really hasn't changed all that much. Sticky Byte Factoring on the other hand can tell what exactly has changed, not just that things have changed.

• Question 142:

  A company has just deployed a VMware environment. The EMC Avamar storage administrator wants to ensure they receive the highest level of de-duplication within the environment for backups of certain clients. Which type of backup should be performed for those clients?

  A. ESX Console
  B. Guest
  C. vSphere Image
  D. VCB Image
  B. Guest

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• Question 143:

  What is a characteristic of EMC Avamar VMware Image backups?

  A. Only one proxy server is supported per vCenter server
  B. File-level restores are supported for Linux clients only
  C. Change Block Tracking can be used to shorten backup times
  D. The Avamar client is installed on each VMware virtual machine
  C. Change Block Tracking can be used to shorten backup times

• Question 144:

  Which level of data can be restored using EMC Avamar?

  A. Directories only
  B. Files only
  C. Files, directories, and file systems
  D. File systems only
  D. File systems only

• Question 145:

  In EMC Avamar, what is the purpose of the p_cache.dat file?

  A. Determines if a chunk is already stored on the Avamar server
  B. Determines if a file is already stored on the Avamar server
  C. Stores storage node IP addresses
  D. Sets backup flags and options
  A. Determines if a chunk is already stored on the Avamar server

• Question 146:

  According to EMC best practices, what is recommended when planning for an EMC Avamar client deployment?

  A. Maximum of 5 million to 10 million files per client
  B. Maximum of 5 TB of database data per client
  C. Maximum of 10 TB of file system data per client
  D. Maximum of 500 GB of database data per client
  A. Maximum of 5 million to 10 million files per client

• Question 147:

  An EMC Avamar system is integrated with an EMC Data Domain system. When a backup has expired on the Avamar server, what is the impact to the backup data stored on the Data Domain system?

  A. Backup data is marked for deletion on the Data Domain system
  B. Backup data is deleted from the Data Domain system
  C. Backup data on the Data Domain system is replicated 59
  D. Cleaning is run on the Data Domain system
  A. Backup data is marked for deletion on the Data Domain system

• Question 148:

  Which size Avamar Gen4 node has 100 GBs of SSD storage?

  A. 1.3 TB
  B. 2.6 TB
  C. 3.9 TB
  D. 7.8 TB
  D. 7.8 TB

• Question 149:

  A company with a multi-node EMC Avamar Data Store has experienced a catastrophic disk failure due to a RAID controller error on a storage node. Which fault tolerance feature provides protection against data corruption on that node?

  A. RAID
  B. RAIN
  C. HFSCheck
  D. Checkpoints
  B. RAIN

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  I am sure answer is NOT A As assessment I was selecting A which is not valid in the results Avamar ensures protection from disk and data corruption through the use of RAID (redundant array of independent disks). The type of RAID depends on the particular node type.

  

  The phases of hfscheck mentioned above run in the following sequence: 1- indexsweep 2- datasweep 3- paritysweep 4- refcheck During the indexsweep phase, the system confirms the integrity of the index (the index is the "table of contents" for all the data on the system) and also caches the index entries for each data chunk onto the same disk where the chunk itself is stored. This is done to improve the performance of later phases of the hfscheck. The datasweep phase is typically the longest phase of hfscheck. This phase reads each data chunk from the system and compares the hash of that chunk with the hash that is recorded in the index. This confirms that each data chunk is the same as it was when it was backed up. As I'm sure you know, multi-node Avamar systems are protected by RAIN parity. During the paritysweep phase, the parity information is recalculated and checked against the parity information on disk. The refcheck phase of hfscheck checks the referential integrity of the backups by verifying that every chunk of data that is referenced by a backup can be found in the index. https://community.emc.com/thread/180789

• Question 150:

  At which percentage of the O/S capacity does garbage collection stop running in an EMC Avamar environment?

  A. 85
  B. 90
  C. 96
  D. 100
  A. 85

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  Capacity Threshold Warnings: 80% of user capacity = warning, start planning for expansion or cleanup 95% user capacity is the health check warning, new backups are suspended 100% user capacity makes the Avamar read-only, can still restore from server 85% of OS capacity = Garbage collection stops running, utilization increases rapidly 90% OS capacity = HFS checks stop running 96% OS capacity = no more checkpoints