EMC EMC Specialist E20-390 Questions & Answers

• Question 351:

  What is the minimum acceptable number of drives in a RAID 5 pool on a VNX array?

  A. 3

  B. 4

  C. 5

  D. 9

  Correct Answer: A

  Explanation:

  

• Question 352:

  Which failover software is strongly recommended for a host attached to a VNX array?

  A. PowerPath

  B. MPIO

  C. DMP

  D. ALUA

  Correct Answer: D

• Question 353:

  Which criterion must be met before executing the storagepool destroy command with Navisphere Secure CLI?

  A. Complete removal of all LUNs from the pool

  B. Complete removal of unused LUNs from the pool

  C. Complete removal of large LUNs from the pool

  D. Complete removal of empty LUNs from the pool

  Correct Answer: C

• Question 354:

  Which utility must be used to upgrade VNX OE array-based software?

  A. Unisphere Server Manager

  B. NST DAE Installation Utility

  C. Unisphere Installation Utility

  D. Unisphere Server Utility

  Correct Answer: A

• Question 355:

  A file system has auto_extend enabled. If the file system size is greater than the extend_size value, what will happen when the file system reaches its HWM?

  A. The file system is extended by the extend_size value.

  B. The file system is extended by five percent of its size.

  C. The extend_size value cannot be less than the file system size.

  D. The file system will not be extended.

  Correct Answer: B

  Explanation: Auto extension causes the file system to automatically extend when it reaches the high water mark and permits you to grow the file system gradually on an as-needed basis. The file system usage threshold is an integer in the range of 50-99 percent (the default is 90 percent). With auto- extension enabled and the HWM set at 90 percent, an automatic extension guarantees that the file system usage is at least 3 percent below the HWM.

  Calculating the automatic extension size depends on the extend_size value and the current file system size, the file system I/O rate and polling interval. If the file system usage after the first extension is within three percent of the HWM, the Control Station extends the file system by an additional amount, bringing file system usage below three percent of the HWM. If a file system is smaller than the extend_size value, it extends by its size when it reaches the HWM. If a file system is larger than the extend_size value, it extends by 5 percent of its size or the extend_size, whichever is larger, when it reaches the HWM.

• Question 356:

  What will happen if compression is enabled on a thick LUN?

  A. The thick LUN will be migrated to a user-defined RAID group LUN

  B. The thick LUN will be migrated to a thin LUN in the same storage pool

  C. Both read and write cache will be disabled for the LUN

  D. Compression will start immediately on the thick LUN.

  Correct Answer: B

  Explanation:

  

• Question 357:

  Which optional software is commonly installed to provide full high availability from a Windows host system to a VNX array?

  A. Adapter Firmware Upgrade

  B. Emulex Configuration Utility

  C. Navisphere Agent

  D. PowerPath

  Correct Answer: A

• Question 358:

  Which statement is true about metaLUNs?

  A. Expansion of metaLUNs by striping provides instant additional space to a host

  B. MetaLUNs simplify the design and implementation process

  C. Private LUN expansion is unsupported on metaLUNs.

  D. MetaLUNs are supported by traditional RAID groups and pools.

  Correct Answer: C

• Question 359:

  What are the available Usermapper roles?

  A. Local, Remote, and Client

  B. Primary, Secondary, and Client

  C. Primary, Local, and Remote

  D. Active, Passive, and Standby

  Correct Answer: B

  Explanation:

  

• Question 360:

  Which eth interface on the VNX Control Station is used for the customer network?

  A. eth0

  B. eth1

  C. eth2

  D. eth3

  Correct Answer: D