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Dell E20-526 Exam Practice Questions (P. 2)

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Question #6
A customer has a large ESX server environment they are considering deploying to XtremIO for a VDI implementation. To determine a baseline of the environment, you are proceeding with documenting each servers CPU, NIC, and disk utilization statistics. The customer has provided you with direct CLI access to the servers to conduct this assessment.
Which utility should be used to monitor these performance parameters?
  1. A
    esxtop
  2. B
    resxtop
  3. C
    top
  4. D
    iostat

Correct Answer:
B
resxtop is a command to retrieve performance statistics. This command is included in vSphere command line interface (CLI) and is part of the vSphere
Management Assistant (vMA), which is an equivalent to esxtop that runs only inside an ESX service console.
Incorrect Answers:
A: esxtop runs only inside an ESX service console.
D: Use the iostat command to report statistics about disk input and output, and to produce measures of throughput, utilization, queue lengths, transaction rates, and service time.
References: www.emc.com/collateral/TechnicalDocument/docu5265.pdf, page 22

Question #7
A customer has recently purchased an XtremIO 10 TB single X-Brick cluster for an implementation of Oracle RAC. The customer wants your help with integrating
Oracle with their new XtremIO cluster. The customer has three DATA disk groups, two REDO disk groups, and four FRA disk groups.
How many XtremIO LUNs should be assigned to the FRA disk groups?
  1. A
    2
  2. B
    4
  3. C
    6
  4. D
    8

Correct Answer:
D
Best practice is to use four LUNs for the DATA disk group to allow the host to use simultaneous threads. The REDO and FRA disk groups should use two LUNs each.
References:
https://community.emc.com/community/connect/everything_oracle/blog/2016/03/31/best-practises-of-vblock-on-xtremio-with-oracle-databases-part-i

Question #8
Which multipathing software is supported by XtremIO?
  1. A
    PowerPath/VE and NMP on ESXi hosts
  2. B
    MPIO on non-clustered Microsoft Windows hosts only
  3. C
    PowerPath/VE on Microsoft Windows VMs hosted by ESXi
  4. D
    Native MPIO on IBM AIX clusters

Correct Answer:
A
Noting the inefficiencies in VMwares NMP driver, EMC developed a set of drivers specifically designed to overcome these limitations and improve the performance and reliability of the data passing between an array and a server. EMC developed the PowerPath family of products optimized specifically for Linux,
Microsoft Windows, and UNIX Operating Systems as well as PowerPath/VE for VMware vSphere and Microsoft Hyper-V hypervisors.
PowerPath is installed on hosts to provide path failover, load balancing and performance optimization VPLEX engines (or directly to the XtremIO array if VPLEX is not used).
Note: VMware, with the cooperation of its storage partners, developed a Native Multipathing Plug-in (NMP). VMware NMP was designed to distribute the load over all the available paths and provide failover protection in the case of path, port or HBA failure, but it has not been fully optimized to work with the controllers in a storage systems. VMwares NMP Round Robin policy does not have the intelligence that PowerPath has as PowerPath uses testing and diagnostics to continually monitor an environment to determine the optimal path for queuing requests and will adapt to current conditions.
References:
https://www.emc.com/collateral/analyst-reports/emc-taneja-group-powerpath-tb.pdf

Question #9
Based on best practice, what is the maximum number of paths a host should have to an XtremIO volume?
  1. A
    4
  2. B
    8
  3. C
    16
  4. D
    32

Correct Answer:
C
The recommended maximum number of paths to storage ports per host is 16 as per the table below.

References:
https://www.emc.com/collateral/white-papers/h14475-wp-xtremio-brocade-best-practices.pdf?isPublic=false
, page 12

Question #10
A new 500 GB VM disk is created on a database that resides on an XtremIO LUN. The VMware administrator plans to provision the disk using the thick provisioned eager zeroed format.
How much physical XtremIO capacity will be allocated during this process?
  1. A
    5 GB
  2. B
    10 GB
  3. C
    50 GB
  4. D
    None D

Correct Answer:
Explanation
XtremIO storage is natively thin provisioned, using a small internal block size. This provides fine-grained resolution for the thin provisioned space.
All volumes in the system are thin provisioned, meaning that the system consumes capacity only when it is actually needed. XtremIO determines where to place the unique data blocks physically inside the cluster after it calculates their fingerprint IDs. Therefore, it never pre-allocates or thick-provisions storage space before writing.
References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 22

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