EMC EMC Certifications E20-598 Questions & Answers

• Question 31:

  A company using EMC Avamar has decided to virtualize their Microsoft Exchange environment using VMware guests instead of physical systems.

  Which backup methodology must they use to perform hot backups and restores of their Microsoft Exchange environment?

  A. VMware Consolidated

  B. VMware Image Level with Change Block Tracking

  C. VMware Image Level without Change Block Tracking

  D. VMware Guest Level

  Correct Answer: D

  You must use the backup agents to backup Exchange and SQL. Databases on Image level backups will not be consistent.

  To backup the environments, you would need to do a guest level backup. i.e. Install the avamar agent, and the exchange VSS plugin on the Exchange server, and the SQL plugin on the sql server. If you want to backup the OS, ensure you

  create windows datasets to skip the database files on the server, otherwise you'll be backing up database files that look totally different each time (consuming huge amounts of space on the grid), that will be no good to you (they'll be

  inconsistent)!

  Besides the above points, the Exchange VSS plugin has some fairly useful functionality, like being able to backup databases in parrallel, and being able to do granular level restores (i'm still trying to get this to work).

  Well worth using.

  https://community.emc.com/thread/126801

• Question 32:

  In steady state, what is the approximate rate of data removed from an EMC Avamar grid during a daily garbage collection?

  A. 10 GB per hour per node

  B. 10 GB per hour per grid

  C. 100 GB per hour per node

  D. 100 GB per hour per grid

  Correct Answer: A

  http://gregandthenetwork.blogspot.com/2013/12/design-imapact-of-avamar-system.html Garbage Collection is the single most important process to ensure a consistent state of the Avamar. If garbage collection is running, the system is in a read-only state and no other maintenance or backup can run. Coincidentally, if backup is still running, garbage collection will not begin. Garbage collection can free up about 10GB/node/hour once the Avamar is in a steady state, but this will take longer as utilization of the Avamar grows.

• Question 33:

  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

  Correct Answer: B

  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 34:

  You are configuring standard replication for a source EMC Avamar system, Avamar1, under the clients domain. The configuration is successful, and the client inquires about where the replicated clients appear on the target Avamar system. Which domain contains the source clients on the target system?

  A. /REPLICATE/Avamar1

  B. /REPLICATE/Avamar1/clients

  C. /root/clients

  D. /clients/Avamar1

  Correct Answer: B

  

• Question 35:

  Which role is used to perform and monitor restores?

  A. Activity Operator

  B. Backup/Restore User

  C. Restore Only Operator

  D. Restore Only User

  Correct Answer: C

  

• Question 36:

  

  A Microsoft Windows user is about to start an on-demand backup using avtar when the utility node fails on their multi-node EMC Avamar server. What must be done to ensure the backup will run and complete successfully?

  A. The utility node must be replaced and the configuration restored prior to starting the backup

  B. The spare node must be converted to a utility node and the configuration restored to the utility node

  C. The client must be activated temporarily to the first storage node and then the backup can be run

  D. Nothing. Backup is performed from the client to the storage nodes directly

  Correct Answer: D

  

  Avamar Node Types and Processes There are several different types of Nodes within an Avamar Server. The Utility node is the identity of the Avamar Server and provides the bulk of the internal Avamar server processes such as: Avamar Administrator (used to manage the Avamar Server from a gui), cron jobs, DNS, NTP, external authentication, web access, MCS and EMS. MCS (Management Console Server) provides centralized management including scheduling of backups, restore of backups, monitoring and reporting. EMS (Enterprise Manager Server) provides web based management for multiple Avamar Servers as well as monitoring and configuration for Avamar Replication. Web Access provides access to documentation, backup plug-ins as well as remote File System restore access to end users. Are next type of node is the Storage Node, which run a process called gsan. This service communicates with the avtar command on the individual backup clients. Avtar communicates with a storage nodes gsan process, then that storage node spreads the data across the available data nodes. A Spare Node is an active node that is present in a multi-node RAIN (Redundant Array of Independent Nodes) grid. The interesting thing about the Spare Node is that it is NOT a hot spare. There is a procedure in place that needs to be followed when a failed Storage Node occurs. In fact, the Avamar Server doesn't even care if the Spare Node is powered on, so if you are a "Green" conscience company, feel free to leave the Spare Node powered down. EMC Best Practice is to leave the Spare Node up and active though. Avamar Backups clients can be installed with 2 different types of client plug-ins: File System and Databases. The Avamar client uses 2 processes in the backup and restore process: Avtar and Avagent. The Avagent process listens for backup/restore work orders from the MCS service on the Utility Node using port 28002 and executes the avtar command that handles the backup/restore processes and communicates with the gsan service on the storage nodes. This process is depicted in the included picture above. Lastly, in a previous blog, I discussed the 2 different licensable options for Avamar and how the disks are comprised in each Storage Nodes type. These are depicted in the picture above as well as a breakdown of how the disks are structured. Please stop back by later, I plan to talk about the NDMP Accelerator and it's role in the Avamar System.

• Question 37:

  What is the maximum number and types of nodes for an EMC Avamar multi-node server?

  A. 7 storage, 1 utility, and 1 spare

  B. 15 storage, 1 utility, 1 accelerator, and 1 spare

  C. 16 storage, 1 utility, and 1 spare

  D. 18 storage, 1 utility, and 1 spare

  Correct Answer: C

• Question 38:

  Which port is used by EMC Avamar for Management Console Database access?

  A. 5555

  B. 7778

  C. 7781

  D. 8443

  Correct Answer: A

  

• Question 39:

  

  

  What are characteristics of a single node server with integrated Data Domain?

  A. Non-RAIN; requires replication if Avamar Checkpoint data is backed up on Data Domain

  B. Non-RAIN; does not require replication if Avamar Checkpoint data is backed up on Data Domain

  C. RAIN; does not require replication if Avamar Checkpoint data is backed up on Data Domain

  D. RAIN; requires replication if Avamar Checkpoint data is backed up on Data Domain

  Correct Answer: B

  

• Question 40:

  

  An EMC customer is using EMC NetWorker and Data Domain in their backup environment. They now want to install an EMC Avamar server and monitor all products from a single console. Which software would you recommend?

  A. Replication Manager

  B. Backup and Recovery Manager

  C. Enterprise Manager

  D. Data Protection Advisor

  Correct Answer: B