EMC EMC Certifications E20-598 Questions & Answers

• Question 151:

  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

  Correct Answer: A

• Question 152:

  When sizing a large file server on an EMC Avamar, how many bytes per file are added to the file cache?

  A. 20

  B. 24

  C. 40

  D. 44

  Correct Answer: D

  The most important thing to do on a client with so many files is to make sure that the file cache is sized appropriately. The file cache is responsible for the vast majority (>90%) of the performance of the Avamar client. If there's a file cache

  miss, the client has to go and thrash your disk for a while chunking up a file that may already be on the server.

  So how to tune the file cache size?

  The file cache starts at 22MB in size and doubles in size each time it grows. Each file on a client will use 44 bytes of space in the file cache (two SHA-1 hashes consuming 20 bytes each and 4 bytes of metadata). For 25 million files, the client

  will generate just over 1GB of cache data.

  http://jslabonte.blogspot.com/2013/08/avamar-and-large-dataset-with-multiples.html

• Question 153:

  When sizing a large database server on an EMC Avamar, how many bytes per entry are added to the hash cache?

  A. 20

  B. 24

  C. 40

  D. 44

  Correct Answer: B

  The most important thing to do on a client with so many files is to make sure that the file cache is sized appropriately. The file cache is responsible for the vast majority (>90%) of the performance of the Avamar client. If there's a file cache

  miss, the client has to go and thrash your disk for a while chunking up a file that may already be on the server.

  So how to tune the file cache size?

  The file cache starts at 22MB in size and doubles in size each time it grows. Each file on a client will use 44 bytes of space in the file cache (two SHA-1 hashes consuming 20 bytes each and 4 bytes of metadata). For 25 million files, the client

  will generate just over 1GB of cache data.

  http://jslabonte.blogspot.com/2013/08/avamar-and-large-dataset-with-multiples.html

• Question 154:

  Due to a scheduling conflict, an EMC Avamar administrator had to cancel the backup of a client using the Avamar Administration GUI. What happens to the backup data that had already been sent to the Avamar server?

  A. Data is retained for seven days as a partial backup

  B. Chunks from the incomplete backup will be removed at the next garbage collection

  C. Data is retained for the remainder of the retention policy that was used for the backup

  D. Data is tagged "corrupted" and will be marked recoverable at the next HFS check

  Correct Answer: A

• Question 155:

  On which cluster node(s) is the Avamar Windows File System client installed in a Microsoft Windows 2008 cluster?

  A. All nodes

  B. Only the active node

  C. Only the passive nodes

  D. None of the nodes

  Correct Answer: A

• Question 156:

  In which directory are the Avamar data server log files located in a multi-node Avamar server?

  A. /data01/cur on each storage node

  B. /sysinfo/log on the utility node

  C. /data01/cur on the utility node

  D. /var/log on each storage node

  Correct Answer: A

• Question 157:

  A company has just deployed a VMware environment. The EMC Avamar storage administrator wants to ensure they receive the highest level of deduplication within the environment for backups.

  Which type of backup should be performed?

  A. Guest

  B. ESX console

  C. VCB

  D. vSphere Image

  Correct Answer: A

• Question 158:

  A Microsoft Windows user is about to initiate an on-demand backup from the client interface when the utility node fails on their multi-node EMC Avamar grid. What must be done prior to initiating the backup to ensure the backup will complete successfully?

  A. Nothing. Backups are performed from the client to the storage nodes directly.

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

  C. The spare node must be converted to a utility node and the configuration restored to it prior to starting the backup.

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

  Correct Answer: A

• Question 159:

  What is a potential impact of having an undersized hash cache on an EMC Avamar client?

  A. More queries to the Avamar server

  B. Decreased memory swapping

  C. More backup data sent to the Avamar server

  D. More chunks are compressed

  Correct Answer: A

• Question 160:

  A company recently deployed an EMC Avamar Gen4 server with Avamar 6.0 software to protect their data. The backup administrator wants system state protection for their critical Microsoft Windows 2003 servers.

  What is the recommended method?

  A. HomeBase embedded feature

  B. Windows Server Backup

  C. NTBackup option

  D. HomeBase embedded with HomeBase server

  Correct Answer: A