EMC EMC Certifications E20-598 Questions & Answers

• Question 51:

  A storage administrator is troubleshooting an EMC Avamar client that is failing with "Time Out - Start". Which log is the first place to check?

  A. avagent.log

  B. err.log

  C. avtar.log

  D. gsan.log

  Correct Answer: A

  The location of the client logs will vary depending on the platform: On Windows: C:\program files\avs\var\ On Linux: /usr/local/avamar/var On other UNIX platforms: /opt/AVMRclnt/var On NetWare: sys:\avamar\var On MAC: /private/var/avamar You can retrieve maintenance logs (checkpoint, hfscheck, gc) using the "dumpmaintlogs" command and the GSAN itself logs errors in /data01/cur/err.log on each node but in general.

• Question 52:

  What is used to qualify a virtual environment for running an EMC AVE solution?

  A. iperf

  B. EBSS

  C. Performance Assurance Tool

  D. Procedure Generator

  Correct Answer: C

  Iperf

  

  EBSS While there are several products that can be used to size an EMC deduplication system for Avamar or Data Domain, only the EMC Backup System Sizer (EBSS) is an official EMC product. It runs on Adobe Air and there for runs on Windows or Mac, and EMC recommends you always download the latest version. It will come in a zip file which includes supplements and a client questionnaire. Performance Assurance Tool

  

• Question 53:

  

  What is the smallest supported RAIN configuration for EMC Avamar?

  A. 1 utility node, 0 spare nodes, 3 storage nodes

  B. 1 utility node, 0 spare nodes, 1 storage node

  C. 1 utility node, 1 spare node, 4 storage nodes

  D. 1 utility node, 1 spare node, 2 storage nodes

  Correct Answer: A

  Also known as the Non-RAIN (Redundant Array of Independent Nodes) configuration. This is the entry level configuration in which the single node acts as the utility node and the data storage node. When using this configuration 2 single

  nodes are needed. 1 is the main backup node, and the 2nd is used for replication purposes for fault tolerance. Used in small to medium sized environments.

  Muti-Node Non RAIN.

  This is basically is a 3 node setup consisting of 1 Utility Node and 2 Data Storage Nodes. It allows for double the storage capacity of a Single Node device. This configuration also needs a duplicate setup for replication, so a total of 6 Nodes

  would be needed for fault tolerance. Used in medium sized environments.

  Multi-Node RAIN.

  The Standard RAIN configuration has 1 Utility Node, 4 Data Storage Nodes and 1 Spare Node. This configuration can be expanded for a total of 16 Data Storage Nodes max. All of the nodes work together to balance the storage equally

  across all of the other Data Storage Nodes. This architecture is easily scaled by adding as many Storage nodes as necessary. Typically used in large environments, this configuration can be initially setup with 3 Storage nodes instead of the

  standard 4 Storage nodes. It is recommended to setup a duplicate Multi-Node RAIN for replication, typically at a DR site. Although it is recommended, it is not a necessity like the Non-RAIN configurations, because there is a spare node that

  can be configured at any point for fault tolerance.

• Question 54:

  

  What are the three OS user accounts used by the EMC Avamar server for authentication?

  A. root, dpn, replonly

  B. admin, MCUser, repluser

  C. root, MCUser, replonly

  D. root, admin, dpn

  Correct Answer: D

  

• Question 55:

  Which port on the EMC Avamar server does a client connect to when performing backups?

  A. 7778

  B. 7781

  C. 27000

  D. 28002

  Correct Answer: C

• Question 56:

  By default, which process runs on the EMC Avamar utility node?

  A. GSAN

  B. MCS

  C. avscc

  D. SNMP

  Correct Answer: B

• Question 57:

  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%

  Correct Answer: C

  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 58:

  

  At which percentage of OS capacity does EMC Avamar garbage collection stop running?

  A. 80%

  B. 85%

  C. 88%

  D. 90%

  Correct Answer: B

  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 59:

  A storage node in a multi-node EMC Avamar server has failed, and a full node replacement is being performed. What is used to reconstruct the data on the replacement node?

  A. RAID

  B. RAIN

  C. Replication

  D. Checkpoint

  Correct Answer: B

• Question 60:

  Which four account management actions can be performed from the EMC Client Manager interface?

  A. View management log Configure new datasets and schedules Retire clients Move clients to a new server

  B. View management log Retire clients Delete clients Browse client file systems

  C. Move clients to a new domain Retire clients Modify client group associations Start manual backups

  D. Move clients to a new server Retire clients Move clients to a new domain Push client software upgrades

  Correct Answer: D