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Dell E20-526 Exam Practice Questions (P. 3)

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Question #11
A customer wants to purchase an XtremIO array. After the array is installed, the customer wants to initially disable encryption. What is the result of enabling encryption on an array that is already being used?
  1. A
    Data will remain in place but the XtremIO cluster services will need to be temporarily shutdown.
  2. B
    Data will remain in place and there will be no interruption to the XtremIO cluster services.
  3. C
    Data will be erased but there will be no interruption to the XtremIO cluster services.
  4. D
    Data will be erased and the XtremIO cluster services will be temporarily shutdown.

Correct Answer:
A
Disable Encryption and Non-Encrypted Models
This version [Ver. 4.0.2-65] allows disabling the Data at Rest Encryption (DARE), if desired. Disabling and Enabling is done when the cluster is stopped.
References: https://samshouseblog.com/2015/12/29/new-features-and-changes-in-xtremio-ver-4-0-2-65/

Question #12
An XtremIO administrator is having a problem with performance and is troubleshooting the issue. What is an accurate statement about I/O transfers?
  1. A
    As I/O size increases, IOPs increase, and latency increases
  2. B
    As I/O size increases, IOPs decrease, and bandwidth increases
  3. C
    As I/O size decreases, IOPs increase, and bandwidth increases
  4. D
    As I/O size decreases, IOPs decrease, and latency increases A

Correct Answer:
Explanation
Large block I/O by nature incurs higher latency.
References: Introduction to the EMC XtremIO STORAGE ARRAY (April 2015), page 6

Question #13
You are designing an XtremIO solution for a potential customer. If the server and storage information is available, which information should be documented regarding the customers capacity expectations?
  1. A
    Capacity requirements on a per data center basis Expandability/scalability Performance requirements determined on a server-to-server basis
  2. B
    Capacity requirements on a per volume basis Expandability/scalability Performance requirements determined on a server-to-server basis
  3. C
    Capacity requirements on a per volume basis Compression rates/scalability Performance requirements determined on a server-to-server basis
  4. D
    Capacity requirements on a per data center basis Expandability/scalability Performance requirements determined holistically

Correct Answer:
B

Question #14
A customer has purchased a two X-Brick XtremIO array with a physical XtremIO Management Server (XMS). The customer plans to use all Fibre Channel connectivity in the environment.
What are the physical connectivity requirements for the cluster?
  1. A
    1 Copper Ethernet connection, 4 Fibre Channel Optical connections
  2. B
    3 Copper Ethernet connections, 8 Fibre Channel Optical connections
  3. C
    4 Copper Ethernet connections, 16 Fibre Channel Optical connections
  4. D
    5 Copper Ethernet connections, 8 Fibre Channel Optical connections

Correct Answer:
B
EMC XTREMIO 4.0 SYSTEM SPECIFICATIONS

References:
http://www.aecl.com/AECWeb/media/Assets/PDF/h12451-xtremio-4-system-specifications-ss.pdf

Question #15
A storage administrator is configuring SAN switches and zoning to connect an eight X-Brick XtremIO array. A VMware ESXi server is hosted on a blade chassis with 16 HBA ports. In addition, the SAN is composed of two separate SAN switches.
What is the recommended XtremIO best practice for zoning?
  1. A
    Two HBA connections per host connected to a single switch Multiple initiators/multiple targets per zone Maximum of 4 paths for each LUN per zone
  2. B
    Connect a single storage controller to the first switch Connect a second storage controller to the second switch Single initiator/multiple targets per zone Maximum of 6 paths for each LUN per zone
  3. C
    Connect all N1 storage controllers to the first switch Connect N2 storage controllers to the second switch Multipath all host ports to single LUNs per zone Maximum of 4 paths for each LUN per zone
  4. D
    Multiple HBA connections per host Single initiator/single target per zone Maximum of 2 paths to each X-Brick for each initiator Each host connected to each SAN switch

Correct Answer:
B
In an environment where a host with two HBAs (VMware Best Practice) is connected to two fabrics and storage array with two Storage Controllers (EMC VNX, for example) the host will have four paths to a LUN: 2 Controllers x 2 HBAs = 4 paths
If you go to the extreme and configure your XtremIO with eight X-Brick, you have 16 controllers. Again, two HBAs per host and the max number of LUNs you can attach to an ESXi host will be 32 I understand, different OSes may have different limits than VMware and this logic will not be applicable.
If you have hit the limit of 1024 paths per host (1024 / 4 controllers / 2 HBAs = 128 LUNs) and need to provision more LUNs, the best way will be to re-zone the host to limit the number of X-Bricks / Controllers the host HBA can connect to.
The following diagram displays the logical connection topology for 4 paths.

Incorrect Answers:
D: Eliminate single-initiator to single-target zones.
References:
http://vstrong.info/2015/11/18/vmware-host-zoning-for-multi-x-brick-emc-xtremio-storage-array/

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