EMC E20-598 Online Practice Questions and Exam Preparation

EMC E20-598 Online Questions & Answers

• Question 121:

  Your readiness checks show that a customer's Gen4 Avamar server has entered a read-only status. To avoid data loss, which recommended state should the Avamar server be in before you can continue the "Add Node" procedure?

  A. Known good controlled state
  B. Read-only state
  C. Steady state
  D. Suspended state
  A. Known good controlled state

• Question 122:

  Refer to the exhibit.

  

  Shown is a diagram of the domain structure of an EMC Avamar server. How does this domain structure deviate from best practices?

  A. ClientA should not be registered in the root domain
  B. Domain2 should not be nested in another domain
  C. ClientB should not be in a domain that also contains a domain
  D. Domain3 should have at least one client
  A. ClientA should not be registered in the root domain

• Question 123:

  A node has failed on a multi-node EMC Avamar grid and is offline. The customer insists on running backups while the replacement is occurring.

  What can you tell the customer about the impact of running backups during a node replacement procedure?

  A. Replacement procedure will take significantly longer with backups running
  B. Replacement procedure will be unaffected by running backups
  C. Replacement procedure cannot continue while backups are running
  D. Replacement procedure will take less time with backups running
  A. Replacement procedure will take significantly longer with backups running

• Question 124:

  

  Based on the exhibit, Which type of backup configuration is represented?

  A. Image Level Backup with VADP (vSphere)
  B. VMware Guest Level Backup
  C. VMware Consolidated Backup (VCB)
  D. VMware Console Backup
  A. Image Level Backup with VADP (vSphere)

• Question 125:

  By default, what percentage of file system storage space is reserved for operating systems and checkpoint overhead on an EMC Avamar server?

  A. 10%
  B. 20%
  C. 35%
  D. 50%
  C. 35%

  ---

  The OS View is the total file system in the Avamar, while the gsan View is the total allocated to stripes. Gsan view is 65% of the Avamar server and it is used mainly for user data - this is the licensed capacity. Above that, 20% of the system file space is used for checkpoint overhead and the remaining 15% is for the operating system. http://gregandthenetwork.blogspot.com/2013/11/managing-avamar-server-capacity.html

• Question 126:

  Which process divides the data into chunks for EMC Avamar deduplication data flow processing?

  A. Compression
  B. Hash cache checking
  C. SHA-1 Hashing
  D. Sticky-byte factoring
  D. Sticky-byte factoring

  ---

  Assume the file HAS been changed, and therefore the hash of the file no longer matches the hash in the file cache. From here, the data will be broken into variable segment lengths through Avamar's patented sticky byte factoring process.

  These segments are then compressed and hashed, and the resulting hash is written to a HASH CACHE file locally on the client. This file is also loaded into RAM when a backup is initiated.

  http://www.egroup-us.com/2011/09/emc-avamar-how-source-global-dedupe-magic-happens/

  Avamar, 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.

  http://storagezilla.typepad.com/storagezilla/2007/09/the-future-is-v.html

• Question 127:

  At which percentage of user capacity will EMC Avamar issue the first warning?

  A. 70
  B. 80
  C. 85
  D. 65
  B. 80

  ---

  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

• Question 128:

  An EMC Avamar customer is analyzing the DPN Summary report shown in the exhibit.

  

  What does the field "TotalBytes" represent?

  A. Number of bytes examined during the backup
  B. Number of bytes from modified files not sent due to commonality
  C. Total bytes reduced due to compression
  D. Total bytes sent to the server during the backup
  B. Number of bytes from modified files not sent due to commonality

• Question 129:

  What is a characteristic of variable block deduplication?

  A. Better granularity and more efficiency
  B. Commonly provided in snapshot technologies
  C. Small changes require all segments to change
  D. Most common deduplication method
  A. Better granularity and more efficiency

• Question 130:

  Which Information is required when registering an EMC Avamar environment to IBGroup?

  A. Microcode number
  B. Avamar node sizes
  C. LUN configuration
  D. Avamar license size
  A. Microcode number